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Zeitschriftenartikel zum Thema „Bassin du Changjiang (Yangtze)“

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Veröffentlicht am 25. Mai 2024

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1

Men, Ke-Pei, und Shu-Dan Zhu. „The Ordered Network Structure and its Prediction for the Big Floods of the Changjiang River Basins“. Zeitschrift für Naturforschung A 68, Nr. 12 (01.12.2013): 766–72. http://dx.doi.org/10.5560/zna.2013-0061.

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According to the latest statistical data of hydrology, a total of 21 floods took place over the Changjiang (Yangtze) River Basins from 1827 to 2012 and showed an obvious commensurable orderliness. In the guidance of the information forecasting theory of Wen-Bo Weng, based on previous research results, combining ordered analysis with complex network technology, we focus on the summary of the ordered network structure of the Changjiang floods, supplement new information, further optimize networks, construct the 2D- and 3D-ordered network structure and make prediction research. Predictions show that the future big deluges will probably occur over the Changjiang River Basin around 2013 - 2014, 2020 - 2021, 2030, 2036, 2051, and 2058.

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2

Cheung, Richard Ching Wa, Moriaki Yasuhara, Hokuto Iwatani, Chih-Lin Wei und Yun-wei Dong. „Benthic community history in the Changjiang (Yangtze River) mega-delta: Damming, urbanization, and environmental control“. Paleobiology 45, Nr. 3 (22.07.2019): 469–83. http://dx.doi.org/10.1017/pab.2019.21.

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AbstractThe coastal environment of the Changjiang delta has been influenced by recent anthropogenic activities such as dam construction and increased sewage and fertilizer inputs. Previous work examined the compositional shift of marine plankton to assess ecological impacts of these activities on marine ecosystems in the Changjiang discharge area. Here we used benthic marine ostracodes collected in the Changjiang estuary and the adjacent East China Sea in the 1980s and the 2010s, respectively, to investigate temporal changes of the benthic community and controlling factors for the benthic fauna. Our results revealed more shoreward distribution of some well-known offshore ostracode species in the 2010s compared with the 1980s and a relatively more important role for environmental processes (e.g., bottom-water temperature, bottom-water salinity, and eutrophic conditions of surface water) than spatial processes (e.g., the flow of ocean currents) in structuring ostracode compositions. The temporal changes in the ostracode community are likely attributable to the combined effects of reduced fresh water and sediment discharge and eutrophic conditions of the Changjiang due to the many dams constructed along the Changjiang and population expansion in the Changjiang Basin. Results of redundancy analysis and variation partitioning suggest that ocean currents facilitated environmental filtering of ostracode species such that they could disperse to preferred environmental conditions. These findings highlight the potential uses of marine microfossils to better understand ecological impacts on benthic ecosystems in vulnerable Asian mega-deltas and provide insights into the integration of metacommunity concepts in disentangling dynamics of marine benthic communities.

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3

Shankman, David, Barry D. Keim, Tadanobu Nakayama, Rongfang Li, Dunyin Wu und W. Craig Remington. „Hydroclimate Analysis of Severe Floods in China’s Poyang Lake Region“. Earth Interactions 16, Nr. 14 (01.12.2012): 1–16. http://dx.doi.org/10.1175/2012ei000455.1.

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Abstract Poyang Lake in Jiangxi Province is the largest freshwater lake in China and is historically a region of significant floods. Maximum annual lake stage and the number of severe flood events have increased during the past few decades because of levee construction that reduced the area available for floodwater storage. The most severe floods since 1950 occurred during 1954, 1973, 1983, 1995, and 1998. Each of these floods followed El Niño events that influence the Asian monsoon and that are directly linked to rainfall in the Changjiang (Yangtze River) basin. The 1954 flood was the largest ever recorded until the 1990s. That year the peak Changjiang stage at Hukou was 21.6 m, which was 1.6 m above the previous record high. The last major flood on the Changjiang was during 1998, when the peak Changjiang stage reached 22.5 m, higher than during 1954, even though peak discharge was lower. The most severe floods, including those in 1954 and 1998, require both 1) high rainfall and tributary discharge into Poyang Lake and 2) high Changjiang discharge and stage at Hukou that backflows into the lake or slows Poyang Lake drainage. Since gauging stations were established on the Changjiang, these conditions always occurred following an El Niño.

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4

Kubota, Y., R. Tada und K. Kimoto. „Changes in East Asian summer monsoon precipitation during the Holocene deduced from a freshwater flux reconstruction of the Changjiang (Yangtze River) based on the oxygen isotope mass balance in the northern East China Sea“. Climate of the Past 11, Nr. 2 (17.02.2015): 265–81. http://dx.doi.org/10.5194/cp-11-265-2015.

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Abstract. The δ18O of seawater (δ18Ow), an indirect indicator of sea surface salinity (SSS), in the northern East China Sea (ECS) is reconstructed for the Holocene using paired analyses of Mg / Ca ratio and δ18O of planktic foraminiferal tests. According to modern observation, interannual variations in SSS during summer in the northern ECS are mainly controlled by the Changjiang (Yangtze River) discharge, which reflects summer rainfall in its drainage basin. Thus, changes in the summer SSS in the northern ECS are interpreted as reflecting variations in the East Asian summer monsoon (EASM) precipitation in the Changjiang Basin. This interpretation is confirmed by a strong relationship between the SSS in the northern ECS and the Changjiang discharge during the wet season (May–October) based on instrumental salinity records from 1951 to 2000. However, it is difficult to estimate absolute salinity values in the past with high accuracy, because the past salinity–δ18Ow regression slope, end member salinity, and δ18Ow values are not well understood. Here, we conduct δ18Ow mass-balance calculation to estimate the freshwater contribution to the surface water of the northern ECS during the last 7 kyr by assuming a simple mixing between two end members – the seawater and the Changjiang freshwater. The result indicates that there has been no gradual decreasing secular trend in the Changjiang freshwater flux from the middle Holocene to the present day, suggesting that summer insolation in the Northern Hemisphere does not regulate the EASM precipitation in the Changjiang Basin. Instead, internal feedback appears to have been more important during the Holocene. The absence of a decreasing trend in regional summer precipitation over the Changjiang Basin since the middle Holocene is contradictory to Chinese speleothems' δ18O records, suggesting that it is not possible to explain orbital changes in Chinese speleothems' δ18O during the Holocene by changes in summer precipitation, but that such changes are related to other factors such as changes in the moisture source.

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5

Huang, Y., W. F. Yang und L. Chen. „Water resources change in response to climate change in Changjiang River basin“. Hydrology and Earth System Sciences Discussions 7, Nr. 3 (25.05.2010): 3159–88. http://dx.doi.org/10.5194/hessd-7-3159-2010.

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Abstract. Doubtlessly, global climate change and its impacts have caught increasing attention from all sectors of the society world-widely. Among all those affected aspects, hydrological circle has been found rather sensitive to climate change. Climate change, either as the result or as the driving-force, has intensified the uneven distribution of water resources in the Changjiang (Yangtze) River basin, China. In turn, drought and flooding problems have been aggravated which has brought new challenges to current hydraulic works such as dike or reservoirs which were designed and constructed based on the historical hydrological characteristics, yet has been significantly changed due to climate change impact. Thus, it is necessary to consider the climate change impacts in basin planning and water resources management, currently and in the future. To serve such purpose, research has been carried out on climate change impact on water resources (and hydrological circle) in Changjiang River. The paper presents the main findings of the research, including main findings from analysis of historical hydro-meteorological data in Changjiang River, and runoff change trends in the future using temperature and precipitation predictions calculated based on different emission scenarios of the 24 Global Climate Modes (GCMs) which has been used in the 4th IPCC assessment report. In this research, two types of macro-scope statistical and hydrological models were developed to simulate runoff prediction. Concerning the change trends obtained from the historical data and the projection from GCMs results, the trend of changes in water resources impacted by climate change was analyzed for Changjiang River. Uncertainty of using the models and data were as well analyzed.

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6

Hu, Jingwen, Zhengxin Yang, Yuxin Yi, Zhaoqing Shu, Pan Yu, Qingmin You und Quanxi Wang. „Possible Origin and Distribution of an Invasive Diatom Species, Skeletonema potamos, in Yangtze River Basin (China)“. Water 15, Nr. 16 (09.08.2023): 2875. http://dx.doi.org/10.3390/w15162875.

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Skeletonema potamos is a freshwater diatom that has been widely distributed in North America, Europe, and Australia since the 1980s. However, there have been few previous reports of S. potamos in China. Only recently has S. potamos been frequently found in our extensive ecological surveys in China, and it has sometimes even been the dominant species. This study clarified the morphology, distribution, and origin of S. potamos, as well as the underlying mechanism contributing to its dominance. We examined the samples collected from the Changjiang River (Yangtze River) Basin during 2016–2022 and determined their geographical distribution. Genetic distance analysis indicated that S. potamos strains in China might have been transported by ships and ballast water from the USA or Japan through the East Sea into the Yangtze River Estuary. Cargo ships possibly contribute to its dispersal. An analysis of the ecological factors affecting the occurrence and distribution of S. potamos in China indicated that many waterbodies provide environments suitable for S. potamos. The suitable environment, small size, and rapid reproduction of S. potamos are the reasons for its dominance in the Yangtze River Basin. We predict that S. potamos is likely to form “blooms” in China in the future.

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7

Chen, Zhongyuan, und Yiwen Zhao. „Impact on the Yangtze (Changjiang) Estuary from its drainage basin: Sediment load and discharge“. Chinese Science Bulletin 46, S1 (Januar 2001): 73–80. http://dx.doi.org/10.1007/bf03187240.

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8

Tang, Xianqiang, Rui Li, Ding Han und Miklas Scholz. „Response of Eutrophication Development to Variations in Nutrients and Hydrological Regime: A Case Study in the Changjiang River (Yangtze) Basin“. Water 12, Nr. 6 (07.06.2020): 1634. http://dx.doi.org/10.3390/w12061634.

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Data and literature related to water quality as well as nutrient loads were used to evaluate the Changjiang River (also Yangtze or Yangzi) Basin with respect to its hydrological regime, sediment transport, and eutrophication status. Waterbodies exhibited different eutrophic degrees following the ranking order of river < reservoir < lake. Most of the eutrophic lakes and reservoirs distributed in the upstream Sichuan Basin and Jianghan Plain are located in the middle main stream reaches. During the past decade, the water surface area proportion of moderately eutrophic lakes to total evaluated lakes continually increased from 31.3% in 2009 to 42.7% in 2018, and the trophic level of reservoirs rapidly developed from mesotrophic to slightly eutrophic. Construction and operation of numerous gates and dams changed the natural transportation rhythm of runoff, suspended solids (SS), and nutrients, and reduced flow velocity, resulting in decreased discharge runoff, slow water exchange, and decreased connectivity between rivers and lakes as well as accumulated nutrient and SS, which are the main driving forces of eutrophication. To mitigate eutrophication, jointly controlling and monitoring nutrient concentrations and flux at key sections, strengthening water quality management for irrigation backwater and aquaculture wastewater, and balancing transportation among runoff, SS, and nutrients is recommended.

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9

SATO, Osamu, Takao NAKAGAWA und Tetsuo HASHIMOTO. „Recent tritium levels in environmental waters collected at the drainage basin of Changjiang (Yangtze river), China.“ RADIOISOTOPES 38, Nr. 12 (1989): 529–36. http://dx.doi.org/10.3769/radioisotopes.38.12_529.

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10

Li, Gen, Xingchen T. Wang, Zhongfang Yang, Changping Mao, A. Joshua West und Junfeng Ji. „Dam-triggered organic carbon sequestration makes the Changjiang (Yangtze) river basin (China) a significant carbon sink“. Journal of Geophysical Research: Biogeosciences 120, Nr. 1 (Januar 2015): 39–53. http://dx.doi.org/10.1002/2014jg002646.

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11

Yang, S. L., Z. Shi, H. Y. Zhao, P. Li, S. B. Dai und A. Gao. „Research Note:Effects of human activities on the Yangtze River suspended sediment flux into the estuary in the last century“. Hydrology and Earth System Sciences 8, Nr. 6 (31.12.2004): 1210–16. http://dx.doi.org/10.5194/hess-8-1210-2004.

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Abstract. The surface erosion area in the Yangtze River basin increased from 364×103 km2 in the 1950s to 707×103 km2 in 2001 due to a great increase in population. Based on the regression relationship between surface erosion area and population, the surface erosion area was predicted to be about 280×103 km2 at the beginning of the 20th century. The sediment yield, which increased by about 30% during the first six decades of the 20th century, was closely related to the surface erosion area in this river basin. The Yangtze annual suspended sediment flux into the estuary was about 395×106 t a-1 at the beginning of the century, and this gradually increased to an average of 509×106 t a-1 in the 1960s. The increase in the suspended sediment flux into the estuary was accelerated in the 1950s and the 1960s due to the rapid increase in population and land use immediately after the Second World War and the Liberation War. After the riverine suspended sediment flux reached its maximum in the 1960s, it decreased to <206×106 t a-1 in 2003. Construction of dams was found to be the principal cause for this decreasing trend because, during the same period, (a) the riverine water discharge did not show a decreasing trend, (b) water diversion was not influential and (c) sedimentation in lakes and canals of the middle and lower reaches did not increase. The total storage capacity of reservoirs has increased dramatically over the past half century. The amount of sediment trapped in reservoirs has increased to more than half a billion t a-1. As a result, the suspended sediment flux into the estuary dramatically decreased, even though the sediment yield from many areas of the basin increased in recent decades. Human activities gradually increased the suspended sediment flux into the estuary before the 1960s and then rapidly decreased it. The last century was a period when the Yangtze suspended sediment flux into the estuary was dramatically affected by human activities. Keywords: riverine sediment flux, human activities, surface erosion, dam, Yangtze (Changjiang) River

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12

Hu, Bangqi, Houjie Wang, Zuosheng Yang und Xiaoxia Sun. „Temporal and spatial variations of sediment rating curves in the Changjiang (Yangtze River) basin and their implications“. Quaternary International 230, Nr. 1-2 (Januar 2011): 34–43. http://dx.doi.org/10.1016/j.quaint.2009.08.018.

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13

Gong, Lebing, Chong-yu Xu, Deliang Chen, Sven Halldin und Yongqin David Chen. „Sensitivity of the Penman–Monteith reference evapotranspiration to key climatic variables in the Changjiang (Yangtze River) basin“. Journal of Hydrology 329, Nr. 3-4 (Oktober 2006): 620–29. http://dx.doi.org/10.1016/j.jhydrol.2006.03.027.

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14

Hao, Qiang, Min Tang, Xiangtong Huang, Chi Zhang, Shaohua Dang und Shouye Yang. „Holocene wildfire regime shifts induced by the enhancement of human activities in the Changjiang (Yangtze River) Basin“. CATENA 240 (Mai 2024): 107998. http://dx.doi.org/10.1016/j.catena.2024.107998.

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15

Yang, Chengfan, Nathalie Vigier, Shouye Yang, Marie Revel und Lei Bi. „Clay Li and Nd isotopes response to hydroclimate changes in the Changjiang (Yangtze) basin over the past 14,000 years“. Earth and Planetary Science Letters 561 (Mai 2021): 116793. http://dx.doi.org/10.1016/j.epsl.2021.116793.

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16

Chen, Xiqing, Yongqiang Zong, Erfeng Zhang, Jiangang Xu und Shijie Li. „Human impacts on the Changjiang (Yangtze) River basin, China, with special reference to the impacts on the dry season water discharges into the sea“. Geomorphology 41, Nr. 2-3 (November 2001): 111–23. http://dx.doi.org/10.1016/s0169-555x(01)00109-x.

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17

Taofa, Zhou, Wu Mingan, Fan Yu, Duan Chao, Yuan Feng, Zhang Lejun, Liu Jun, Qian Bing, Franco Pirajno und David R. Cooke. „Geological, geochemical characteristics and isotope systematics of the Longqiao iron deposit in the Lu-Zong volcano-sedimentary basin, Middle-Lower Yangtze (Changjiang) River Valley, Eastern China“. Ore Geology Reviews 43, Nr. 1 (Dezember 2011): 154–69. http://dx.doi.org/10.1016/j.oregeorev.2011.04.004.

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18

LI, Daoji. „Oxygen depletion off the Changjiang (Yangtze River) Estuary“. Science in China Series D 45, Nr. 12 (2002): 1137. http://dx.doi.org/10.1360/02yd9110.

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19

Chen, Jingsheng, Feiyue Wang, Xinghui Xia und Litian Zhang. „Major element chemistry of the Changjiang (Yangtze River)“. Chemical Geology 187, Nr. 3-4 (August 2002): 231–55. http://dx.doi.org/10.1016/s0009-2541(02)00032-3.

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20

Patra, Sivaji, Congqiang Liu, Siliang Li, Fushun Wang und Baoli Wang. „Water chemical behavior at Yangtze (Changjiang) River estuary“. Chinese Journal of Geochemistry 25, S1 (März 2006): 269–70. http://dx.doi.org/10.1007/bf02840267.

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21

Zhang, G. L., J. Zhang, S. M. Liu, J. L. Ren und Y. C. Zhao. „Nitrous oxide in the Changjiang (Yangtze River) Estuary and its adjacent marine area: riverine input, sediment release and atmospheric fluxes“. Biogeosciences Discussions 7, Nr. 3 (03.05.2010): 3125–51. http://dx.doi.org/10.5194/bgd-7-3125-2010.

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Abstract. Dissolved nitrous oxide (N2O) was measured in the waters of the Changjiang (Yangtze River) Estuary and its adjacent marine area during five surveys covering the period of 2002–2006. Dissolved N2O concentrations ranged from 6.04 to 21.3 nM, and indicate seasonal variations with high values occurring in summer and spring. Dissolved riverine N2O was observed monthly at station Xuliujing of the Changjiang, and ranged from 12.4 to 33.3 nM with an average of 20.8±7.8 nM. The average annual input of N2O from the Changjiang to the estuary and its adjacent area was estimated to be 15.8×106 mol/yr. N2O emission rates from the sediments of the Changjiang Estuary in spring ranged from −1.88 to 2.02 μmol m−2 d−1, which suggest that sediment can act as either a source or a sink of N2O in the Changjiang Estuary. The annual sea to air N2O fluxes from the Changjiang Estuary were estimated to be 6.8±3.7, 13.3±7.2 and 14.9±8.3 μmol m−2 d−1 using LM86, W92 and RC01 relationships, respectively. The annual sea to air N2O fluxes from the adjacent marine area were estimated to be 8.5±7.8, 15.3±13.5 and 17.4&plusmn15.7 μmol m−2 d−1 using LM86, W92 and RC01 relationship, respectively. Hence the Changjiang Estuary and its adjacent marine area is a net source of atmospheric N2O.

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22

Zhang, G. L., J. Zhang, S. M. Liu, J. L. Ren und Y. C. Zhao. „Nitrous oxide in the Changjiang (Yangtze River) Estuary and its adjacent marine area: Riverine input, sediment release and atmospheric fluxes“. Biogeosciences 7, Nr. 11 (09.11.2010): 3505–16. http://dx.doi.org/10.5194/bg-7-3505-2010.

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Abstract. Dissolved nitrous oxide (N2O) was measured in the waters of the Changjiang (Yangtze River) Estuary and its adjacent marine area during five surveys covering the period of 2002–2006. Dissolved N2O concentrations ranged from 6.04 to 21.3 nM, and indicate great temporal and spatial variations. Distribution of N2O in the Changjiang Estuary was influenced by multiple factors and the key factor varied between cruises. Dissolved riverine N2O was observed monthly at station Xuliujing of the Changjiang, and ranged from 12.4 to 33.3 nM with an average of 19.4 ± 7.3 nM. N2O concentrations in the river waters showed obvious seasonal variations with higher values occurring in both summer and winter. Annual input of N2O from the Changjiang to the estuary was estimated to be 15.0 × 106 mol/yr. N2O emission rates from the sediments of the Changjiang Estuary in spring ranged from −1.88 to 2.02 μmol m−2 d−1, which suggests that sediment can act as either a source or a sink of N2O in the Changjiang Estuary. Average annual sea-to-air N2O fluxes from the studied area were estimated to be 7.7 ± 5.5, 15.1 ± 10.8 and 17.0 ± 12.6 μmol m−2d−1 using LM86, W92 and RC01 relationships, respectively. Hence the Changjiang Estuary and its adjacent marine area are a net source of atmospheric N2O.

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23

Wang, Baodong. „Assessment of trophic status in Changjiang (Yangtze) River estuary“. Chinese Journal of Oceanology and Limnology 25, Nr. 3 (Juli 2007): 261–69. http://dx.doi.org/10.1007/s00343-007-0261-z.

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24

Cheng, F., X. Song, Z. Yu und D. Liu. „Historical records of eutrophication in Changjiang (Yangtze) River estuary and its adjacent East China Sea“. Biogeosciences Discussions 9, Nr. 6 (01.06.2012): 6261–91. http://dx.doi.org/10.5194/bgd-9-6261-2012.

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Abstract. Two sediment cores from the Changjiang (Yangtze) River estuary and its adjacent East China Sea were collected and studied for eutrophication history using paleoecological records of environmental changes over the last century. A multiproxy approach by using biological and geochemical analyses revealed changes in diatom assemblages, total organic carbon (TOC), total nitrogen (TN) and biogenic silica (BSi) and give an indication of nutrient in status and trends in Changjiang River estuary and its adjacent East China Sea. The diatom assemblages in the two cores generally increased gradually from the 1970s, and accelerated from the 1990s until now, reflecting the increased eutrophication and causing large algae blooms/red tides. The TOC, TN and BSi showing the similar trends, supported the interpretation of the eutrophication process indicated by diatom analyses. The two cores were located in different sea areas of the East China Sea, and we discuss their relative changes based on their environment characteristics. We also discuss the potential effect of anthropogenic influences and ongoing projects on eutrophication in the Changjiang River and its adjacent East China Sea.

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25

Wang, Baodong, Qinsheng Wei, Jianfang Chen und Linping Xie. „Annual cycle of hypoxia off the Changjiang (Yangtze River) Estuary“. Marine Environmental Research 77 (Juni 2012): 1–5. http://dx.doi.org/10.1016/j.marenvres.2011.12.007.

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26

Dai, S. B., und X. X. Lu. „Sediment load change in the Yangtze River (Changjiang): A review“. Geomorphology 215 (Juni 2014): 60–73. http://dx.doi.org/10.1016/j.geomorph.2013.05.027.

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27

Yao, Qing-Zheng, Zhi-Gang Yu, Hong-Tao Chen, Peng-Xia Liu und Tie-Zhu Mi. „Phosphorus transport and speciation in the Changjiang (Yangtze River) system“. Applied Geochemistry 24, Nr. 11 (November 2009): 2186–94. http://dx.doi.org/10.1016/j.apgeochem.2009.09.023.

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28

Jiang, Tao, Hongbo Liu, Yuhai Hu, Xiubao Chen und Jian Yang. „Revealing Population Connectivity of the Estuarine Tapertail Anchovy Coilia nasus in the Changjiang River Estuary and Its Adjacent Waters Using Otolith Microchemistry“. Fishes 7, Nr. 4 (23.06.2022): 147. http://dx.doi.org/10.3390/fishes7040147.

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The estuarine tapertail anchovy, Coilia nasus, is a migratory fish with high economic value in China. We collected fish from the Changjiang River (the Yangtze River) estuary, the Qiantang River estuary, and the southern Yellow Sea, and studied their relationships using otolith elemental and stable isotopic microchemistry signatures to assess the population connectivity of C. nasus. Results show that, in addition to Ca, other elements were present in the otolith core. The δ18O, Na/Ca, Fe/Ca, and Cu/Ca values of the Qiantang population were significantly higher than those of the others, whereas its δ13C and Ba/Ca values were found to be significantly lower. Otolith multi-element composition and stable isotope ratios differed significantly between the Qiantang and Changjiang estuary groups (p < 0.05); however, no difference was observed between the latter and the Yellow Sea group. Cluster analysis, linear discriminant analysis, and a self-organizing map strongly suggest possible connectivity between the fish populations of the Changjiang estuary and Yellow Sea, while the population of the Qiantang River estuary appears to be independent. Notably, results suggest a much closer connectivity between the fish populations of the Changjiang River and the Yellow Sea.

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29

Wu, Hui, Bing Deng, Rui Yuan, Jun Hu, Jinghua Gu, Fang Shen, Jianrong Zhu und Jing Zhang. „Detiding Measurement on Transport of the Changjiang-Derived Buoyant Coastal Current“. Journal of Physical Oceanography 43, Nr. 11 (01.11.2013): 2388–99. http://dx.doi.org/10.1175/jpo-d-12-0158.1.

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Abstract Measuring the transport of the Changjiang (also known as the Yangtze) River–derived buoyant coastal current, that is, the Min–Zhe Coastal Current, is of great importance for understanding the fate of terrestrial materials from this large river into the open ocean, but it is usually difficult to achieve because of the energetic tidal currents along the Chinese coast. In February 2012, a detiding cruise survey was carried out using the phase-averaging method. For the first time, this coastal current has been quantified with in situ data and has been shown to have a volume transport of 0.215 Sv (1 Sv ≡ 106 m3 s−1) and a maximum surface velocity of ~50 cm s−1. The ratio between the volume transport of the buoyant coastal current and that of the Changjiang is O(10). Freshwater transport by the buoyant coastal current accounts for over 90% of the Changjiang River's discharge. Buoyancy and winds are both important in driving this current.

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Große, Fabian, Katja Fennel, Haiyan Zhang und Arnaud Laurent. „Quantifying the contributions of riverine vs. oceanic nitrogen to hypoxia in the East China Sea“. Biogeosciences 17, Nr. 10 (19.05.2020): 2701–14. http://dx.doi.org/10.5194/bg-17-2701-2020.

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Abstract. In the East China Sea, hypoxia (oxygen ≤ 62.5 mmol m−3) is frequently observed off the Changjiang (or Yangtze River) estuary covering up to about 15 000 km2. The Changjiang is a major contributor to hypoxia formation because it discharges large amounts of freshwater and nutrients into the region. However, modeling and observational studies have suggested that intrusions of nutrient-rich oceanic water from the Kuroshio Current also contribute to hypoxia formation. The relative contributions of riverine vs. oceanic nutrient sources to hypoxia have not been estimated before. Here, we combine a three-dimensional physical-biogeochemical model with an element-tracing method to quantify the relative contributions of nitrogen from different riverine and oceanic sources to hypoxia formation during 2008–2013. Our results suggest that the hypoxic region north of 30∘ N is dominated by Changjiang inputs, with its nitrogen loads supporting 74 % of oxygen consumption. South of 30∘ N, oceanic nitrogen sources become more important, supporting 39 % of oxygen consumption during the hypoxic season, but the Changjiang remains the main control on hypoxia formation also in this region. Model scenarios with reduced Changjiang nitrogen loads and reduced open-ocean oxygen levels suggest that nitrogen load reductions can significantly reduce hypoxia in the East China Sea and counteract a potential future decline in oxygen supply from the open ocean into the region.

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Tseng, Y. F., J. Lin, M. Dai und S. J. Kao. „Joint effect of freshwater plume and coastal upwelling on phytoplankton growth off the Changjiang River“. Biogeosciences 11, Nr. 2 (28.01.2014): 409–23. http://dx.doi.org/10.5194/bg-11-409-2014.

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Abstract. The Changjiang (Yangtze) River discharges vast amount of unbalanced nutrients (dissolved inorganic nitrogen and phosphorus with N / P ratio > 80 in general) into the East China Sea in summer. To study nutrient dynamics and P-stress potential for phytoplankton, a cruise was conducted in the Changjiang plume during summer 2011. With 3-D observations of nutrients, chlorophyll a (Chl a), and bulk alkaline phosphatase activity (APA), we concluded that the Changjiang Diluted Water and coastal upwelling significantly influenced the horizontal and vertical heterogeneities of phytoplankton P deficiency in the Changjiang plume. Allochthonous APA was detected at nutrient-enriched freshwater end. Excessive N (~ 10 to 112 μM) was observed throughout the entire plume surface. In the plume fringe featuring stratification and excess N, diapycnal phosphate supply was blocked and phytoplankton APA was stimulated for growth. We observed an upwelling just attaching to the turbidity front at seaward side where Chl a peaked yet much less APA was detected. An external phosphate supply from subsurface, which promoted phytoplankton growth but inhibited APA, was suggested to be sourced from the Nearshore Kuroshio Branch Current. In the so hydrographically complicated Changjiang plume, phosphate supply instead of its concentration may be more important in determining the expression of APA. Meanwhile, allochthonous APA may also alter the usefulness of APA as a P-stress indicator.

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Pei, Shaofeng, Zhiliang Shen und Edward A. Laws. „Nutrient Dynamics in the Upwelling Area of Changjiang (Yangtze River) Estuary“. Journal of Coastal Research 253 (Mai 2009): 569–80. http://dx.doi.org/10.2112/07-0948.1.

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33

Zhou, Jian-yin, Min Wang, Zheng-bing Chen, Jin-qiong Zhao und Chun-yan Hu. „Evolution Trend of the Changjiang (Yangtze) Estuary with reduced incoming sediment“. IOP Conference Series: Earth and Environmental Science 371 (13.12.2019): 032048. http://dx.doi.org/10.1088/1755-1315/371/3/032048.

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34

Beardsley, R. C., R. Limeburner, H. Yu und G. A. Cannon. „Discharge of the Changjiang (Yangtze River) into the East China Sea“. Continental Shelf Research 4, Nr. 1-2 (Januar 1985): 57–76. http://dx.doi.org/10.1016/0278-4343(85)90022-6.

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35

Wu, Jiaxue, Yonghong Wang und Heqin Cheng. „Bedforms and bed material transport pathways in the Changjiang (Yangtze) Estuary“. Geomorphology 104, Nr. 3-4 (März 2009): 175–84. http://dx.doi.org/10.1016/j.geomorph.2008.08.011.

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36

Wang, Baodong. „Cultural eutrophication in the Changjiang (Yangtze River) plume: History and perspective“. Estuarine, Coastal and Shelf Science 69, Nr. 3-4 (September 2006): 471–77. http://dx.doi.org/10.1016/j.ecss.2006.05.010.

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37

Dai, Zhijun, Xuefei Mei, Stephen E. Darby, Yaying Lou und Weihua Li. „Fluvial sediment transfer in the Changjiang (Yangtze) river-estuary depositional system“. Journal of Hydrology 566 (November 2018): 719–34. http://dx.doi.org/10.1016/j.jhydrol.2018.09.019.

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38

Yanling, Liang. „Preliminary study of the aquatic Oligochaeta of the Changjiang (Yangtze) River“. Hydrobiologia 155, Nr. 1 (Dezember 1987): 195–98. http://dx.doi.org/10.1007/bf00025651.

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39

Liblik, Taavi, Yijing Wu, Daidu Fan und Dinghui Shang. „Wind-driven stratification patterns and dissolved oxygen depletion off the Changjiang (Yangtze) Estuary“. Biogeosciences 17, Nr. 10 (29.05.2020): 2875–95. http://dx.doi.org/10.5194/bg-17-2875-2020.

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Abstract. Multiple factors have been accused of triggering coastal hypoxia off the Changjiang Estuary, and their interactions lead to high yearly variation in hypoxia development time window and distribution extent. Two oceanographic cruises, conducted in July 2015 and August–September 2017, were complemented by river discharge, circulation simulation, remotely sensed wind, salinity and sea level anomaly data to study the dissolved oxygen (DO) depletion off the Changjiang Estuary from synoptic to interannual timescales. Intensification of the Chinese Coastal Current and Changjiang Diluted Water (CDW) spreading to the south together with coastal downwelling caused by the northerly wind was observed in the summer of 2015. This physical forcing led to a well-ventilated area in the north and a hypoxic area of 1.3×104 km2 in the south, while in 2017 the summer monsoon (southerly winds) induced offshore transport in the surface layer that caused a subsurface intrusion of Kuroshio-derived water to the shallower areas (<10 m depth) in the north and upwelling in the south. Wind-driven Ekman surface flow and reversal of the geostrophic current related to the upwelling compelled alteration of the Chinese Coastal Current. Consequently, intense hypoxia (DO down to 0.6 mg L−1) starting from 4 to 8 m depth connected to CDW and deep water intrusion in the north and coastal hypoxia linked to the upwelling in the south were observed in 2017. Distinct situations of stratification and DO distributions can be explained by wind forcing and concurrent features in surface and deep layer circulation, upwelling and downwelling events. Enhanced primary production in the upper layer of the CDW or the upwelled water determines the location and extent of DO depletion. Likewise, the pycnocline created by Kuroshio subsurface water intrusion is an essential precondition for hypoxia formation. Wind forcing largely controls the interannual change of hypoxic area location and extent. If the summer monsoon prevails, extensive hypoxia more likely occurs in the north. Hypoxia in the south occurs if the summer monsoon is considerably weaker than the long-term mean.

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Guo, Shujin, und Xiaoxia Sun. „Concentrations and distribution of transparent exopolymer particles in a eutrophic coastal sea: a case study of the Changjiang (Yangtze River) estuary“. Marine and Freshwater Research 70, Nr. 10 (2019): 1389. http://dx.doi.org/10.1071/mf18211.

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Transparent exopolymer particles (TEPs) contribute to carbon export and can represent a significant part of the carbon pool, most notably in eutrophic systems. This study represents the first investigation of the concentrations and distribution of TEPs in the Changjiang (Yangtze River) estuary, one of the most eutrophic coastal seas in the world. The concentration of TEPs was determined on a seasonal basis (spring, summer and autumn), and the distribution patterns of TEPs were studied with respect to physical, chemical and biological conditions. Spatially, TEP concentrations exhibited a significant positive correlation with chlorophyll-a concentrations in spring and summer, which implies a consistent production of TEPs by phytoplankton cells. Vertically, TEP concentrations decreased gradually from the surface layer to the bottom layer in spring and summer, but were distributed homogenously in the water column in autumn. Values of nitrogen:phosphorus ratio (N:P) were found to have a significant positive correlation with TEP concentrations in summer, indicating that a P limitation would probably accelerate production and formation of TEPs. TEP-carbon (TEP-C) concentration was found to be similar to phytoplankton-C in the study area, highlighting the fact that TEP-C could represent a significant fraction of the particulate organic carbon pool in the Changjiang (Yangtze River) estuary.

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Duan, Zongqi, Qingsong Liu, Xuefa Shi, Zhengquan Yao, Jianxing Liu und Kai Su. „Reconstruction of high-resolution magnetostratigraphy of the Changjiang (Yangtze) River Delta, China“. Geophysical Journal International 204, Nr. 2 (15.12.2015): 948–60. http://dx.doi.org/10.1093/gji/ggv497.

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42

Dai, Zhijun, James T. Liu und Yunbo Xiang. „Human interference in the water discharge of the Changjiang (Yangtze River), China“. Hydrological Sciences Journal 60, Nr. 10 (20.08.2015): 1770–82. http://dx.doi.org/10.1080/02626667.2014.944182.

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43

Nian, Xiaomei, Weiguo Zhang, Zhanghua Wang, Qianli Sun, Jing Chen und Zhongyuan Chen. „Optical dating of Holocene sediments from the Yangtze River (Changjiang) Delta, China“. Quaternary International 467 (Februar 2018): 251–63. http://dx.doi.org/10.1016/j.quaint.2018.01.011.

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44

Hori, Kazuaki, Yoshiki Saito, Quanhong Zhao und Pinxian Wang. „Architecture and evolution of the tide-dominated Changjiang (Yangtze) River delta, China“. Sedimentary Geology 146, Nr. 3-4 (Januar 2002): 249–64. http://dx.doi.org/10.1016/s0037-0738(01)00122-1.

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45

Hori, Kazuaki, Yoshiki Saito, Quanhong Zhao, Xinrong Cheng, Pinxian Wang, Yoshio Sato und Congxian Li. „Sedimentary facies and Holocene progradation rates of the Changjiang (Yangtze) delta, China“. Geomorphology 41, Nr. 2-3 (November 2001): 233–48. http://dx.doi.org/10.1016/s0169-555x(01)00119-2.

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46

Lou, Yaying, Zhijun Dai, Yuying He, Xuefei Mei und Wen Wei. „Morphodynamic couplings between the Biandan Shoal and Xinqiao Channel, Changjiang (Yangtze) Estuary“. Ocean & Coastal Management 183 (Januar 2020): 105036. http://dx.doi.org/10.1016/j.ocecoaman.2019.105036.

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47

Weihua, Li, He-Qin Cheng, Li Jiufa und Dong Ping. „Temporal and spatial changes of dunes in the Changjiang (Yangtze) estuary, China“. Estuarine, Coastal and Shelf Science 77, Nr. 1 (März 2008): 169–74. http://dx.doi.org/10.1016/j.ecss.2007.09.006.

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48

Gao, Lei, Dao-Ji Li und Ping-Xing Ding. „Nutrient budgets averaged over tidal cycles off the Changjiang (Yangtze River) Estuary“. Estuarine, Coastal and Shelf Science 77, Nr. 3 (April 2008): 331–36. http://dx.doi.org/10.1016/j.ecss.2007.09.018.

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49

Jianrong, Zhu, Qi Dingman und Xiao Chengyou. „Simulated circulations off the Changjiang (Yangtze) River mouth in spring and autumn“. Chinese Journal of Oceanology and Limnology 22, Nr. 3 (September 2004): 286–91. http://dx.doi.org/10.1007/bf02842561.

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50

Chen, Dong, Zhijun Dai, Ren Xu, Daoji Li und Xuefei Mei. „Impacts of anthropogenic activities on the Changjiang (Yangtze) estuarine ecosystem (1998–2012)“. Acta Oceanologica Sinica 34, Nr. 6 (Juni 2015): 86–93. http://dx.doi.org/10.1007/s13131-015-0679-7.

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