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Статті в журналах з теми "BGC-Argo"
Ford, David. "Assimilating synthetic Biogeochemical-Argo and ocean colour observations into a global ocean model to inform observing system design." Biogeosciences 18, no. 2 (January 21, 2021): 509–34. http://dx.doi.org/10.5194/bg-18-509-2021.
Повний текст джерелаYumruktepe, Veli Çağlar, Erik Askov Mousing, Jerry Tjiputra, and Annette Samuelsen. "An along-track Biogeochemical Argo modelling framework: a case study of model improvements for the Nordic seas." Geoscientific Model Development 16, no. 22 (November 28, 2023): 6875–97. http://dx.doi.org/10.5194/gmd-16-6875-2023.
Повний текст джерелаMignot, Alexandre, Hervé Claustre, Gianpiero Cossarini, Fabrizio D'Ortenzio, Elodie Gutknecht, Julien Lamouroux, Paolo Lazzari, et al. "Using machine learning and Biogeochemical-Argo (BGC-Argo) floats to assess biogeochemical models and optimize observing system design." Biogeosciences 20, no. 7 (April 12, 2023): 1405–22. http://dx.doi.org/10.5194/bg-20-1405-2023.
Повний текст джерелаTeruzzi, Anna, Giorgio Bolzon, Laura Feudale, and Gianpiero Cossarini. "Deep chlorophyll maximum and nutricline in the Mediterranean Sea: emerging properties from a multi-platform assimilated biogeochemical model experiment." Biogeosciences 18, no. 23 (November 30, 2021): 6147–66. http://dx.doi.org/10.5194/bg-18-6147-2021.
Повний текст джерелаRenosh, Pannimpullath Remanan, Jie Zhang, Raphaëlle Sauzède, and Hervé Claustre. "Vertically Resolved Global Ocean Light Models Using Machine Learning." Remote Sensing 15, no. 24 (December 7, 2023): 5663. http://dx.doi.org/10.3390/rs15245663.
Повний текст джерелаWang, Bin, Katja Fennel, and Liuqian Yu. "Can assimilation of satellite observations improve subsurface biological properties in a numerical model? A case study for the Gulf of Mexico." Ocean Science 17, no. 4 (August 26, 2021): 1141–56. http://dx.doi.org/10.5194/os-17-1141-2021.
Повний текст джерелаClaustre, Hervé, Kenneth S. Johnson, and Yuichiro Takeshita. "Observing the Global Ocean with Biogeochemical-Argo." Annual Review of Marine Science 12, no. 1 (January 3, 2020): 23–48. http://dx.doi.org/10.1146/annurev-marine-010419-010956.
Повний текст джерелаShu, Chan, Peng Xiu, Xiaogang Xing, Guoqiang Qiu, Wentao Ma, Robert J. W. Brewin, and Stefano Ciavatta. "Biogeochemical Model Optimization by Using Satellite-Derived Phytoplankton Functional Type Data and BGC-Argo Observations in the Northern South China Sea." Remote Sensing 14, no. 5 (March 7, 2022): 1297. http://dx.doi.org/10.3390/rs14051297.
Повний текст джерелаIzett, Robert W., Katja Fennel, Adam C. Stoer, and David P. Nicholson. "Reviews and syntheses: expanding the global coverage of gross primary production and net community production measurements using Biogeochemical-Argo floats." Biogeosciences 21, no. 1 (January 2, 2024): 13–47. http://dx.doi.org/10.5194/bg-21-13-2024.
Повний текст джерелаTerzić, Elena, Paolo Lazzari, Emanuele Organelli, Cosimo Solidoro, Stefano Salon, Fabrizio D'Ortenzio, and Pascal Conan. "Merging bio-optical data from Biogeochemical-Argo floats and models in marine biogeochemistry." Biogeosciences 16, no. 12 (July 1, 2019): 2527–42. http://dx.doi.org/10.5194/bg-16-2527-2019.
Повний текст джерелаДисертації з теми "BGC-Argo"
Cornec, Marin. "La dynamique des Maxima profonds de phytoplancton : une approche globale avec les flotteurs BGC-Argo." Electronic Thesis or Diss., Sorbonne université, 2020. http://www.theses.fr/2020SORUS383.
Повний текст джерелаThe main objective of this thesis is to map the regional and seasonal distribution of Deep Chlorophyll Maxima (DCM) in the global ocean, to understand the environmental parameters that control their formation and persistence, and to estimate their contribution to global primary production (PP) budgets. This approach is based on measurements from the Biogeochemical-Argo Profiling Floats (BGC-Argo). A method for the detection of DCMs and their typology (biomass or photoacclimation maxima) has been developed and applied to ~60,000 chlorophyll a fluorescence profiles and particle backscatter coefficient (respective proxies of chlorophyll a concentration [Chla], and particulate organic carbon). From this classification, the spatial and temporal occurrence of DCMs was described in 28 regions of the world ocean, allowing to refine the description of their main characteristics (i.e. depth and intensity), and to group the regions into four main types according to the similarity of their DCMs. The estimation of vertical profiles of nitrate concentration and downward irradiance then allowed to describe the main environmental configurations of the different types of regions. In a second step, the impact of mesoscale eddies was studied on the presence of DCMs and their properties by co-locating the BGC-Argo profile database with an atlas of mesoscale eddies detected by satellite altimetry. Finally, an estimate of the contribution of DCMs to global PP was estimated, as well as a regional performance analysis of two models for estimating the vertical profiles of [Chla] from satellite observations, compared to the [Chla] profiles of the BGC-Argo database
TERZIĆ, ELENA. "Marine bio-optical properties applied to biogeochemical modelling." Doctoral thesis, Università degli Studi di Trieste, 2019. http://hdl.handle.net/11368/2940012.
Повний текст джерелаPetit, Flavien. "Developement and exploitation of new approaches for observation of phytoplankton community composition from BGC-Argo floats in open ocean." Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS112.
Повний текст джерелаPhytoplankton play a key role in the regulation of many biogeochemical cycles. It is responsible for half of the world's primary production, contributing to the marine food chain and regulating carbon fluxes between the ocean and the atmosphere. These processes vary with both phytoplankton biomass and community composition. It is therefore a critical challenge to monitor phytoplankton biomass and community composition on a global scale. The BioGeoChemical-Argo (BGC-Argo) program aims to monitor and understand key biogeochemical processes on a global scale by developing an array of profiled Argo floats equipped with an array of biogeochemical sensors. The floats provide information on the phytoplankton community by measuring fluorescence, an indicator of chlorophyll-a concentration, used as a proxy of phytoplankton biomass. However, this measurement has been shown to be highly variable on a global scale. Moreover, it remains complicated to describe the composition of the phytoplankton community from in-situ sensors. First, this thesis presents the role of the phytoplankton community in the variability of the in-situ fluorescence response. A database of fluorescence and chlorophyll-a concentration measurements was studied to demonstrate the key role of phytoplankton community composition on the relationship between fluorescence and chlorophyll-a concentration at different spatial and temporal scales. Then, we developed two different methods to evaluate the phytoplankton community composition. The first one is based on the use of multispectral fluorescence, to estimate a taxonomic index of phytoplankton composition. The second uses a combination of optical and hydrographic measurements to estimate the concentration of four different plankton groups in organic carbon and total particulate organic carbon concentration. Both approaches are based on machine learning methods. In the first case, we established a protocol that collected laboratory and field data to better understand the fluorescence response at different wavelengths as a function of phytoplankton community composition. For the second method we collected data at sea during one year to increase an already existing database. These two methods allowed us to highlight the possibility of estimating the composition of the phytoplankton community from the BGC-Argo profiling floats
Barbieux, Marie. "Étude des relations bio-optiques dans l’océan global et du fonctionnement biogéochimique des maxima de subsurface de chlorophylle en Méditerranée à partir des mesures des flotteurs profileurs BGC-Argo." Electronic Thesis or Diss., Sorbonne université, 2019. http://www.theses.fr/2019SORUS490.
Повний текст джерелаThe main objective of this thesis is to improve our understanding of the spatio-temporal and vertical variability of phytoplankton biomass in the open ocean. First, we investigated the variability of the relationship between the particulate backscattering coefficient (bbp), a bio-optical proxy of the particulate organic carbon, and the chlorophyll a concentration (Chla) at a global scale. In subpolar regimes, concomitant changes in Chla and bbp correspond to variations in phytoplankton biomass. In contrast, in subtropical regimes, a decoupling between the two variables was attributed to photoacclimation processes or a change in the relative abundance of non-algal particles to the particulate assemblage. The Mediterranean Sea stands as an intermediate regime between these two end-members. Next, we analysed the seasonal and regional dynamics of subsurface Chla maxima (SCMs) in the Mediterranean basin by developing a classification of the vertical profiles of Chla and bbp. In the Eastern Mediterranean, SCMs corresponded to an increase in the intracellular Chla induced by photoacclimation of phytoplankton cells. However, in the Western basin of the Mediterranean Sea SCMs corresponded to an actual increase in carbon biomass at depth (SBMs). Lastly, we investigated the potentially significant contribution of SCMs to carbon production, by quantifying the gross community production in the subsurface layer. A method based on the diurnal cycle of bio-optical properties was used in order to estimate production in two distinct regions of the Mediterranean Sea during the oligotrophic season. Our study revealed that SCMs might contribute over 40% of the depth-integrated production in some areas, thereby suggesting the potentially important biogeochemical role of SCMs
Ricour, Florian. "Towards a new insight of the carbon transport in the global ocean." Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS191.
Повний текст джерелаThe ocean is known to play a key role in the carbon cycle. Without it, atmospheric CO2 levels would be much higher than what they are today thanks to the presence of carbon pumps that maintain a gradient of dissolved inorganic carbon (DIC) between the surface and the deep ocean. The biological carbon pump (BCP) is primarily responsible for this gradient. It consists in a series of ocean processes through which inorganic carbon is fixed as organic matter by photosynthesis in sunlit surface waters and then transported to the ocean interior and possibly the sediment where it will be sequestered from the atmosphere for millions of years. The BCP was long thought as solely the gravitational settling of particulate organic carbon (POC). However, a new paradigm for the BCP has recently been defined in which physically and biologically mediated particle injection pumps have been added to the original definition. Physically mediated particle injection pumps provide a pathway to better understand the transport of dissolved organic carbon (DOC) whereas biologically mediated particle injection pumps focus on the transport of POC by vertically migrating animals, either daily or seasonally. Therefore, a better understanding of these processes could help bridge the gap between carbon leaving the surface and carbon demand in the ocean interior. To address this new paradigm, this work will benefit from the advent of recent sensors that equip a new generation of Biogeochemical-Argo floats (BGC-Argo). The first part focuses on the development of an embedded zooplankton classification model for the Underwater Vision Profiler 6 (UVP6) under strict technical and energy constraints. The second part studies particle and carbon fluxes in the Labrador Sea using BGC-Argo floats equipped for the first time with the UVP6 and an optical sediment trap (OST), providing two independent measurements of sinking particles. The last part consists in revisiting the BCP using a new framework called CONVERSE for Continuous Vertical Sequestration. With this new approach, we re-evaluate the total carbon sequestered from the atmosphere (> 100 years) by the BCP and its transport pathways on the entire water column, in contrast to the carbon sequestration typically assumed below a fixed reference depth
Lacour, Léo. "Dynamique des blooms phytoplanctoniques dans le gyre subpolaire de l'Atlantique Nord." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066685/document.
Повний текст джерелаThe North Atlantic Subpolar Gyre exhibits the largest phytoplancton bloom of the global ocean. This major biological event plays a crucial role for the functioning of marine ecosystems and the global carbon cycle. The aim of this thesis is to better understand the bio-physical processes driving the dynamics of the phytoplankton bloom and carbon export at various spatiotemporal scales.In a first study, based on satellite data at a climatological scale, the subpolar gyre is bioregionalized according to distinct annual phytoplankton biomass cycles. The light-mixing regime controls the phytoplankton bloom dynamics in the different bioregions.In a second study, the new generation of BGC-Argo floats allowed for processes to be explored at a finer scale, especially during the overlooked winter season. In winter, intermittent and local restratifications of the mixed layer, triggered by sub-mesoscale processes, initiate transient winter blooms impacting the spring bloom dynamics.Finally, a third study showed how the high-frequency variability of the mixed layer depth during the winter-spring transition plays a crucial role on carbon export
Terrats, Louis. "Le flux de carbone particulaire et le lien avec la communauté phytoplanctonique : une approche par flotteurs-profileurs biogéochimiques." Electronic Thesis or Diss., Sorbonne université, 2022. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2022SORUS550.pdf.
Повний текст джерелаThe ocean plays a key role in the climate by exchanging large quantities of carbon with the atmosphere. Atmospheric carbon is fixed at the ocean surface by phytoplankton that transforms it into biogenic carbon, part of which is transported to the deep ocean by physical and biological mechanisms; this is the Biological Carbon Pump (BCP). A tiny fraction of this biogenic carbon reaches sufficient depths to be sequestered for several centuries before it returns to the atmosphere, thus regulating concentrations of atmospheric CO2. Today, we know enough about the BCP to recognize its importance in climate, but our knowledge of its functioning is limited due to insufficient sampling of biogenic carbon fluxes. Here, we used BioGeoChimical-Argo floats, observational platforms designed to solve the undersampling problem, to explore a major mechanism of the BCP called the gravitational pump. The gravitational pump is the transport of biogenic carbon in the form of organic particles (POC) that sink from the surface into the deep ocean. Our study of the gravitational pump is divided into three axes. The first axis consisted of developing a method to detect blooms of coccolithophores, a major phytoplankton group that potentially has an important control on the transport of POC at depth. The second axis focused on the seasonal and regional variability of POC fluxes in the Southern Ocean, an undersampled area in which several floats have been deployed with an optical sediment trap (OST). Only ten floats were equipped with an OST, which is low compared to the whole BGC-Argo fleet (i.e. several hundred floats). Therefore, in the third axis, we developed a method to estimate the POC flux with the standard sensors of BGC-Argo floats. This method was then applied to hundreds of floats to describe the seasonal variability of the POC flux in many regions. In this study, we also highlighted the link between the POC flux and the nature of surface particles. For example, we calculated relationships between phytoplankton community composition and POC flux at 1000m. Using these relationships, we then used satellite observations to extrapolate POC flux to large spatial scales, such as the entire Southern Ocean and the global ocean
Lacour, Léo. "Dynamique des blooms phytoplanctoniques dans le gyre subpolaire de l'Atlantique Nord." Electronic Thesis or Diss., Paris 6, 2016. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2016PA066685.pdf.
Повний текст джерелаThe North Atlantic Subpolar Gyre exhibits the largest phytoplancton bloom of the global ocean. This major biological event plays a crucial role for the functioning of marine ecosystems and the global carbon cycle. The aim of this thesis is to better understand the bio-physical processes driving the dynamics of the phytoplankton bloom and carbon export at various spatiotemporal scales.In a first study, based on satellite data at a climatological scale, the subpolar gyre is bioregionalized according to distinct annual phytoplankton biomass cycles. The light-mixing regime controls the phytoplankton bloom dynamics in the different bioregions.In a second study, the new generation of BGC-Argo floats allowed for processes to be explored at a finer scale, especially during the overlooked winter season. In winter, intermittent and local restratifications of the mixed layer, triggered by sub-mesoscale processes, initiate transient winter blooms impacting the spring bloom dynamics.Finally, a third study showed how the high-frequency variability of the mixed layer depth during the winter-spring transition plays a crucial role on carbon export
Тези доповідей конференцій з теми "BGC-Argo"
Jemai, Ahlem, Hendrik Bunger, Rohan Henkel, Daniela Vos, Jochen Wollschlager, and Oliver Zielinski. "Hyperspectral underwater light field sensing onboard BGC-Argo Floats." In OCEANS 2021: San Diego – Porto. IEEE, 2021. http://dx.doi.org/10.23919/oceans44145.2021.9705770.
Повний текст джерелаStahl, Frederic, Lars Nolle, Oliver Zielinski, and Ahlem Jemai. "A Model for Predicting the Amount of Photosynthetically Available Radiation from BGC-ARGO Float Observations in the Water Column." In 36th ECMS International Conference on Modelling and Simulation. ECMS, 2022. http://dx.doi.org/10.7148/2022-0174.
Повний текст джерелаЗвіти організацій з теми "BGC-Argo"
Cossarini, Gianpiero. Results of the BGC data assimilation. EuroSea, 2023. http://dx.doi.org/10.3289/eurosea_d4.10.
Повний текст джерелаWimart-Rousseau, Cathy, Marine Fourrier, and Fiedler Björn. Development of BGCArgo data quality validation based on an integrative multiplatform approach. EuroSea, 2022. http://dx.doi.org/10.3289/eurosea_d7.2.
Повний текст джерелаFourrier, Marine. Integration of in situ and satellite multi-platform data (estimation of carbon flux for trop. Atlantic). EuroSea, 2023. http://dx.doi.org/10.3289/eurosea_d7.6.
Повний текст джерелаRémy, Elisabeth, Romain Escudier, and Alexandre Mignot. Access impact of observations. EuroSea, 2023. http://dx.doi.org/10.3289/eurosea_d4.8.
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