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Статті в журналах з теми "Alpine lake sediments"
Pisaric, Michael FJ, Julian M. Szeicz, Tammy Karst, and John P. Smol. "Comparison of pollen and conifer stomates as indicators of alpine treeline in northwestern Canadian lake sediments." Canadian Journal of Botany 78, no. 9 (September 1, 2000): 1180–86. http://dx.doi.org/10.1139/b00-092.
Повний текст джерелаFélix-Faure, J., M. Ramon, C. Hatté, F. Rimet, J. Gaillard, V. Chanudet, A. L. Develle, J. Garcia-Orellana, and E. Dambrine. "Effects of hydropower management on the sediment composition and metabolism of a small Alpine lake." Hydroécologie Appliquée 22 (2022): 1. http://dx.doi.org/10.1051/hydro/2021003.
Повний текст джерелаParker, Brian R., Frank M. Wilhelm, and David W. Schindler. "Recovery of Hesperodiaptomus arcticus populations from diapausing eggs following elimination by stocked salmonids." Canadian Journal of Zoology 74, no. 7 (July 1, 1996): 1292–97. http://dx.doi.org/10.1139/z96-144.
Повний текст джерелаLyon, Eva C., Michael M. McGlue, Edward W. Woolery, Sora L. Kim, Jeffery R. Stone, and Susan R. H. Zimmerman. "Sublacustrine geomorphology and modern sedimentation in a glacial scour basin, June Lake, eastern Sierra Nevada, U.S.A." Journal of Sedimentary Research 89, no. 10 (October 21, 2019): 919–34. http://dx.doi.org/10.2110/jsr.2019.52.
Повний текст джерелаKapusta, Juraj, Juraj Hreško, František Petrovič, Dávid Tomko-Králo, and Jozef Gallik. "Water Surface Overgrowing of the Tatra’s Lakes." Ekológia (Bratislava) 37, no. 1 (March 1, 2018): 11–23. http://dx.doi.org/10.2478/eko-2018-0002.
Повний текст джерелаPigati, Jeffrey S., Ian M. Miller, Kirk R. Johnson, Jeffrey S. Honke, Paul E. Carrara, Daniel R. Muhs, Gary Skipp, and Bruce Bryant. "Geologic setting and stratigraphy of the Ziegler Reservoir fossil site, Snowmass Village, Colorado." Quaternary Research 82, no. 3 (November 2014): 477–89. http://dx.doi.org/10.1016/j.yqres.2013.12.011.
Повний текст джерелаRiedel, Jon L., John J. Clague, and Brent C. Ward. "Timing and extent of early marine oxygen isotope stage 2 alpine glaciation in Skagit Valley, Washington." Quaternary Research 73, no. 2 (March 2010): 313–23. http://dx.doi.org/10.1016/j.yqres.2009.10.004.
Повний текст джерелаWestgate, J. A., D. J. Easterbrook, N. D. Naeser, and R. J. Carson. "Lake Tapps Tephra: An Early Pleistocene Stratigraphic Marker in the Puget Lowland, Washington." Quaternary Research 28, no. 3 (November 1987): 340–55. http://dx.doi.org/10.1016/0033-5894(87)90002-0.
Повний текст джерелаBunbury, Joan, and Konrad Gajewski. "Temperatures of the past 2000 years inferred from lake sediments, southwest Yukon Territory, Canada." Quaternary Research 77, no. 3 (May 2012): 355–67. http://dx.doi.org/10.1016/j.yqres.2012.01.002.
Повний текст джерелаDas, Biplob, Rolf D. Vinebrooke, Arturo Sanchez-Azofeifa, Benoit Rivard, and Alexander P. Wolfe. "Inferring sedimentary chlorophyll concentrations with reflectance spectroscopy: a novel approach to reconstructing historical changes in the trophic status of mountain lakes." Canadian Journal of Fisheries and Aquatic Sciences 62, no. 5 (May 1, 2005): 1067–78. http://dx.doi.org/10.1139/f05-016.
Повний текст джерелаДисертації з теми "Alpine lake sediments"
Czymzik, Markus. "Mid- to Late Holocene flood reconstruction from two varved sediment profiles of pre-alpine Lake Ammersee (Southern Germany)." Phd thesis, Universität Potsdam, 2012. http://opus.kobv.de/ubp/volltexte/2013/6509/.
Повний текст джерелаGlobale Klimamodelle prognostizieren eine Zunahme von Starkhochwassern infolge der Klimaerwärmung. Weiterhin werden natürliche Klimafaktoren die Intensität und Häufigkeit solcher Ereignisse auf Zeitskalen von Jahren bis Jahrtausenden beeinflussen. Für ein umfassendes Verständnis hochwassergenerierender Klimamechanismen müssen daher lange Zeiträume und regionale Muster in Betracht gezogen werden. Aufgrund der Limitierung der meisten instrumentellen Abflusszeitreihen auf die letzten 100 Jahre, bieten diese nur einen sehr begrenzten Einblick in das Spektrum möglicher Klima-Hochwasser Zusammenhänge. Die Nutzung natürlicher Hochwasserarchive, wie warvierter Seesedimente, erlaubt die Untersuchung von Hochwasseraktivität auf Zeitskalen von Jahrtausenden. Durch Hochwasser in einen See eingetragenes detritisches Material bildet, eingeschaltet in den jährlichen Sedimentationszyklus, eine charakteristische Abfolge von Hochwasserlagen auf dem Seeboden. Das Zählen jährlicher Laminierungen und die Position innerhalb eines jährlichen Sedimentationszyklus ermöglichen die Datierung von Hochwasserlagen mit saisonaler Genauigkeit. Der Ammersee bildet ein ideales Archiv zur Rekonstruktion von Hochwassern. Detritisches Material wird durch nur einen Hauptzufluss, die Ammer, in das rinnenförmige Becken transportiert. Die warvierten Sedimente erlauben eine zuverlässige Detektion und Datierung selbst mikroskopischer Hochwasserlagen. An zwei warvierten Sedimentprofilen des Ammersees sind hochauflösende Mikrofazies und Röntgenfluoreszenz (µ-XRF) Analysen durchgeführt worden. Zum besseren Verständnis der Sedimentverteilung im See lag der Fokus der Untersuchungen auf der Detektion detritischer Lagen anhand ihrer sedimentologischen und geochemischen Eigenschaften und der Korrelation dieser Lagen zwischen beiden Sedimentprofilen. Die Datierung der detritschen Lagen erfolgte durch Warvenzählung und wurde durch AMS Radiokarbondatierungen bestätigt. In den Sedimenten der letzten 5500 Jahre wurden 1573 detritische Lagen gefunden. Aufgrund ihrer Eigenschaften lassen sich diese Lagen als Ammerhochwasserlagen interpretieren: (1) Die Mikrofazies deutet auf eine Ablagerung nach Starkabflussereignissen hin. (2) Die geochemische Zusammensetzung beweist die terrestrische Herkunft des Materials. (3) Das proximal-distale Ablagerungsmuster deutet auf die Ammer als Eintragsquelle des Materials hin. Eine Kalibrierung mit instrumentellen Hochwasserdaten der Ammer im Zeitraum von AD 1926 bis 1999 bestätigt die Sukzession der detritischen Lagen als eine Zeitreihe starker Ammerhochwasser im Frühling und Sommer, der Hochwassersaison am Ammersee. Die Häufigkeit der Hochwasserlagen in den letzten 5500 Jahren weist eine deutliche dekadische Variabilität auf. Trends in der Häufigkeit von Hochwasserlagen korrelieren negativ mit dem Index der East Atlantic-Western Russia Oszillation (EA-WR) während der letzten 250 Jahre (Zeitraum der durch die genutzten atmosphärischen Daten abgedeckt ist) und der solaren Aktivität während des kompletten Zeitraums. Diese Übereinstimmungen deuten möglicherweise auf einen solaren Einfluss auf die atmosphärische Zirkulation über Europa und damit auf die Häufigkeit von Hochwassern am Ammersee hin. Weiterhin weist die Zeitreihe der Hochwasserlagen drei Veränderungen der durchschnittlichen Lagenhäufigkeit und -mächtigkeit vor etwa 5500, 2800 und 500 Jahren auf. Die Kombination der Daten beider Sedimentprofile ermöglicht es, diese Veränderungen als schrittweise Anstiege der Hochwasserintensität zu interpretieren. Vermutliche Auslöser sind graduelle Reduktion der solaren Insolation in der Nordhemisphäre und langfristige Minima der solaren Aktivität. Die wahrscheinliche atmosphärische Reaktion auf dieses Klimaforcing ist ein verstärkter Temperaturgradient zwischen den niederen und hohen Breiten, der zu einer Erhöhung der potenziellen Energie in der Atmosphäre und verstärkter Baroklinität führt. Diese Energie wird transferiert in eine Verstärkung der zyklonalen Westwindzirkulation, extremere Niederschläge und eine Intensivierung der Hochwasser am Ammersee. Die Interpretation der Häufigkeit und Mächtigkeit von Hochwasserlagen in den Sedimenten des Ammersees ermöglicht eine Rekonstruktion der Hochwassergeschichte und die Identifizierung hochwasserauslösender Klimafaktoren in der Ammerseeregion während der letzten 5500 Jahre. Hochwasserhäufigkeit und -intensität sind nicht stationär, sondern durch komplexe Veränderungen im Klimasystem auf Zeitskalen von Jahren bis Jahrtausenden geprägt. In diesem Zusammenhang erscheinen die Resultate globaler Klimamodelle, die einen Anstieg des Hochwasserrisikos allein auf Basis eines thermodynamisch intensivierten hydrologischen Kreislaufs infolge der Klimaerwärmung prognostizieren, als stark simplifiziert.
Foster, Gerald Colin. "The geomorphic significance of lake sediments : an integrated lake-catchment study of process and response in a sub-alpine landscape." Thesis, University of Liverpool, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250541.
Повний текст джерелаRubensdotter, Lena. "Alpine lake sediment archives and catchment geomorphology : causal relationships and implications for paleoenvironmental reconstructions." Doctoral thesis, Stockholm : Department of Physical Geography and Quaternary Geology, Stockholm University, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-945.
Повний текст джерелаCzymzik, Markus [Verfasser], and Brauer [Akademischer Betreuer] Achim. "Mid- to Late Holocene flood reconstruction from two varved sediment profiles of pre-alpine Lake Ammersee (Southern Germany) / Markus Czymzik. Betreuer: Brauer Achim." Potsdam : Universitätsbibliothek der Universität Potsdam, 2013. http://d-nb.info/1035307324/34.
Повний текст джерелаEvans, Martin. "Holocene sediment yield and geomorphic sensitivity in alpine landscape, Cathedral Lakes, British Columbia." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq25044.pdf.
Повний текст джерелаDuval, Bastien. "Ecodynamics of trace metals and metalloids in Pyrenean lakes in relation to climate change and anthropogenic pressure." Thesis, Pau, 2020. http://www.theses.fr/2020PAUU3046.
Повний текст джерелаThe management and conservation of Pyrenean high mountain lakes within the current context of climate change and increasing anthropogenic pressure require detailed knowledge of their biogeochemical functioning. In this doctoral thesis, five sampling campaigns were carried out (2017-2019) in more than 20 alpine lakes. The analysis of water samples allowed us to study the occurrence, the depth profiles, the geographical distribution and the seasonal trends of a large array of physico-chemical and biogeochemical parameters. Specifically, the cycle of carbon dioxide (CO2) and the fate of Potentially Harmful Trace Elements (PHTEs) were investigated. The mercury (Hg) was specially studied through the development of an analytical procedure for the measurement of trace concentrations in natural waters and through biogeochemical investigations on the distribution and the fate of Hg species in the water column, as well as in sediment archives.The new and robust procedure developed in this work to measure the total alkalinity (TA) and the dissolved inorganic carbon (DIC) allowed us to determine the other two parameters of the CO2 system, the pH and the fugacity of CO2 (fCO2). The bedrock characteristics of the watershed appear to be the most important parameters influencing the acid status of the studied lakes. Moreover, obtained fCO2 values indicate that lakes are sources of CO2 for the atmosphere.The measurement of various physico-chemical parameters allowed us to discriminate and classify the studied lakes according to their water geochemistry, highlighting the importance of the trophic status of the lakes, the geological background and the atmospheric inputs. The occurrence, sources and behaviour of the PHTEs were investigated with evidence of a contrast between geological and atmospheric inputs. Intensive monitoring revealed some PHTEs to be highly sensitive to environmental changes such as temperature and redox conditions.Monitoring natural concentrations of total Hg in aquatic systems remains a difficult challenge and there is a need for the development of low cost and easy handling analytical methods. The method for analysis of trace Hg concentrations developed and optimized in this work was successfully operational and exhibits a suitable limit of detection and an excellent reproducibility. Hg speciation results in the water column demonstrated the pristine state and the dynamic of the Pyrenean lakes. The homogeneity in the non-gaseous total Hg concentrations in the studied lakes confirmed the absence of local sources and the potential use of these ecosystems as sentinels of regional to global Hg contamination. While inorganic mercury (iHg) did not show seasonal variations, monomethylmercury(MMHg) was significantly higher in autumn 2018 and dissolved gaseous mercury (DGM) varied strongly within and among lakes. In-situ experiments confirmed the conditions that promote Hg methylation (stratified anoxic waters), demethylation and photoreduction (intense UV light).The historical Hg record in sediment archives highlighted temporal trends in Hg accumulation rates (HgARs) with a progressive increase since the 16th Century and the industrialization, mirroring the Hg production in Almadén mines (Southern Spain). Besides, Hg stable isotopes allow the identification of distinct anthropogenic sources as well as past climate variability.Overall, environmental changes in lake ecosystems, induced by either climatic conditions (temperature, light intensity) or anthropogenic pressure (atmospheric inputs, eutrophication, atmospheric CO2) are likely to produce significant impacts among CO2, specific PHTEs and Hg biogeochemical cycles in mountainous ecosystems
Lister, Guy. "Late Pleistocene Alpine deglaciation and post-glacial climatic developments in Switzerland the record from sediments in a peri-alpine lake basin /." 1985. http://catalog.hathitrust.org/api/volumes/oclc/24036988.html.
Повний текст джерелаEvans, Martin. "Holocene sediment yield and geomorphic sensitivity in alpine landscapes, Cathedral Lakes, British Columbia." Thesis, 1997. http://hdl.handle.net/2429/6688.
Повний текст джерелаLou, Jiann-Yuh, and 羅建育. "The Distribution of Elements in the Sediments of Alpine Lakes in Taiwan and the Paleoclimate." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/10261721120794287666.
Повний текст джерела國立中山大學
海洋地質研究所
84
Humic substances can absorb the energy of solar radiation and transfer it to produce singlet oxygen in aqueous system. Singlet oxygen has higher reactivities to oxidize many organic compounds than the ground state triplet oxygen. In this research, the photooxidization of 4 different kinds of polycyclic aromatic hydrocarbons (PAHs), including naphthalene , anthracene, phenathrene and pyrene were studied. Humic substances can act as photosensitizer in the photoreaction of PAHs. The photooxidization rate of PAHs in humic water was faster than that without the existance of humic substances. The effects of soil humic substances are higher than those of the marine ones. The more rings the PAHs have, the slower photooxidization is. Changes in salinity and pH do not alter the photooxidization rates of PAHs, however, the higher concentration of humic substances or higher temperature can speed up the sensitized photoreaction. The addition of Ni2+ or Cu2+ can retard the indirect photoreaction rate, but the addition of Zn2+ makes no difference. Comparing the photoreaction rates irradiated with light sources of 546nm or 435nm wavelength, faster reaction rate was observed for the light with shorter wavelength. The PAHs themselves can also produce singlet oxygen under irradiation even without humic substances. The reactivities of PAHs to 3O2 are in the following order : naphthalene > anthracene > phenanthrene > pyrene. For 1O2, the reactivities are : naphthalene > anthracene > phenanthrene > pyrene.
Tang, Zih-Wei, and 唐子惟. "Late Holocene Diatom Records and Paleo-environmental Changes of the Lacustrine Sediments in Central Alpine Taiwan." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/b76xyz.
Повний текст джерела國立臺灣海洋大學
地球科學研究所
106
Late Quaternary terrestrial environment reconstructions in Taiwan were mostly used palynology and geochemical proxies; however, diatom assembly was used rarely for paleo-environmental reconstructions. In this study, we used multi-proxy methods, including diatom, grain size and Itrax-XRF elemental analysis from a lacustrine sediment core (TLM-1) which was drilled from the littoral side of an alpine lake, Tunlumei Pond (TLM), at Nantou County of central Taiwan. For the diatom analysis, diatom valves were only preserved in upper 95 cm of the core TLM-1, and 34 genera and 83 species of fossil diatoms were identified. On the basis of cluster analysis, four diatom biostratigraphy zones were recognized. Concurrently, the occurrence of diatom valves and the increasing of wetland pollen suggested that the TLM water level attended to the present condition since 750 cal BP. During 750-610 cal. BP, the planktonic species S. pinnata increased, indicating the water level rose. Then, during 610-540 cal. BP, benthic species increased, indicating the water level declined. During 540-470 cal. BP, acidophilous diatom Eunotia intermedia presented a remarkable increase, which may link with frequent hydrological disturbances, such as typhoon or heavy rainfall events. Since 470 cal. BP, S. pinnata was continued to be dominant, indicating the stable aquatic environment as today. Due to the small catchment area of TLM, the large grain sets should be caused by heavy rainfall. Thus, there might have four heavy rainfall periods at approximately 550-450 cal. BP, 1050-950 cal. BP, 1550-1450 cal. BP, and 2200-2100 cal. BP.
Частини книг з теми "Alpine lake sediments"
Steinberg, Christian, Wolfgang Beckstette, Roland Psenner, and Norbert Schulz. "Chemical sediment stratigraphy of four high alpine lakes in Austria." In Paleolimnology IV, 343–48. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-4047-5_45.
Повний текст джерелаArzet, Klaus, Christian Steinberg, Roland Psenner, and Norbert Schulz. "Diatom distribution and diatom inferred pH in the sediment of four alpine lakes." In Paleolimnology IV, 247–54. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-4047-5_32.
Повний текст джерелаCaine, Nel. "Geomorphic Systems of Green Lakes Valley." In Structure and Function of an Alpine Ecosystem. Oxford University Press, 2001. http://dx.doi.org/10.1093/oso/9780195117288.003.0009.
Повний текст джерелаKoster, Eduard. "River Environments, Climate Change, and Human Impact." In The Physical Geography of Western Europe. Oxford University Press, 2005. http://dx.doi.org/10.1093/oso/9780199277759.003.0015.
Повний текст джерелаEtlicher, Bernard. "French and Belgian Uplands." In The Physical Geography of Western Europe. Oxford University Press, 2005. http://dx.doi.org/10.1093/oso/9780199277759.003.0022.
Повний текст джерелаТези доповідей конференцій з теми "Alpine lake sediments"
Muscott, Amelia, Darren J. Larsen, Sarah Crump, and Lane Wang. "A 14,000-YEAR RECORD OF ROCK GLACIER ACTIVITY IN THE TETON RANGE, WY FROM ALPINE LAKE SEDIMENTS." In GSA Connects 2021 in Portland, Oregon. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021am-369997.
Повний текст джерелаMuscott, Amelia, Darren J. Larsen, and Sarah Crump. "A CONTINUOUS RECORD OF HOLOCENE PALEOENVIRONMENTS AND NEOGLACIATION IN THE TETON RANGE, WYOMING, FROM ALPINE LAKE SEDIMENTS." In GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-383472.
Повний текст джерелаAnderson, Lesleigh, Gary L. Skipp, Laura E. Strickland, Jeffrey Honke, Jeremey Havens, and Paco VanSistine. "HOLOCENE PALEOHYDROLOGY AND DROUGHT IN THE UPPER COLORADO RIVER BASIN FROM ALPINE LAKE SEDIMENT ON THE WASATCH PLATEAU, CENTRAL UTAH, USA." In GSA Connects 2021 in Portland, Oregon. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021am-365821.
Повний текст джерелаЗвіти організацій з теми "Alpine lake sediments"
Summary geochemical maps for samples of rock, stream sediment, and nonmagnetic heavy-mineral concentrates, Carson-Iceberg and Leavitt Lake Roadless Areas, Alpine, Mono, and Tuolumne counties, California. US Geological Survey, 1986. http://dx.doi.org/10.3133/mf1416c.
Повний текст джерела