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A BGC-Argo Guide: Planning, Deployment, Data Handling and Usage ArchiMer
Bittig, Henry C.; Maurer, Tanya L.; Plant, Joshua N.; Schmechtig, Catherine; Wong, Annie P. S.; Claustre, Hervé; Trull, Thomas W.; Udaya Bhaskar, T. V. S.; Boss, Emmanuel; Dall’olmo, Giorgio; Organelli, Emanuele; Poteau, Antoine; Johnson, Kenneth S.; Hanstein, Craig; Leymarie, Edouard; Le Reste, Serge; Riser, Stephen C.; Rupan, A. Rick; Taillandier, Vincent; Thierry, Virginie; Xing, Xiaogang.
The Biogeochemical-Argo program (BGC-Argo) is a new profiling-float-based, ocean wide, and distributed ocean monitoring program which is tightly linked to, and has benefited significantly from, the Argo program. The community has recommended for BGC-Argo to measure six additional properties in addition to pressure, temperature and salinity measured by Argo, to include oxygen, pH, nitrate, downwelling light, chlorophyll fluorescence and the optical backscattering coefficient. The purpose of this addition is to enable the monitoring of ocean biogeochemistry and health, and in particular, monitor major processes such as ocean deoxygenation, acidification and warming and their effect on phytoplankton, the main source of energy of marine ecosystems. Here we...
Tipo: Text Palavras-chave: Ocean observation; Ocean biogeochemical cycles; Sensors; Carbon cycle; Ocean optics; Best practices; Argo.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00512/62344/66607.pdf
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Multivariate approach for the retrieval of phytoplankton size structure from measured light absorption spectra in the Mediterranean Sea (BOUSSOLE site) ArchiMer
Organelli, Emanuele; Bricaud, Annick; Antoine, David; Uitz, Julia.
Models based on the multivariate partial least squares (PLS) regression technique are developed for the retrieval of phytoplankton size structure from measured light absorption spectra (BOUSSOLE site, northwestern Mediterranean Sea). PLS-models trained with data from the Mediterranean Sea showed good accuracy in retrieving, over the nine-year BOUSSOLE time series, the concentrations of total chlorophyll a [Tchl a], of the sum of seven diagnostic pigments and of pigments associated with micro, nano, and picophytoplankton size classes separately. PLS-models trained using either total particle or phytoplankton absorption spectra performed similarly, and both reproduced seasonal variations of biomass and size classes derived by high performance liquid...
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Ano: 2013 URL: http://archimer.ifremer.fr/doc/00185/29655/28031.pdf
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Processing BGC-Argo CDOM concentration at the DAC level ArchiMer
Schmechtig, Catherine; Organelli, Emanuele; Poteau, Antoine; Claustre, Hervé; D'Ortenzio, Fabrizio.
In the open ocean, Colored Dissolved Organic Matter (CDOM) is the fraction of the total Dissolved Organic Matter (DOM), composed by a mixture of chemically complex algal degradation products that interact with light. CDOM absorbs solar radiation in the UV and visible ranges (Bricaud et al., 1981) and, if illuminated, re-emits light as fluorescence (i.e., FDOM; Coble 1996). These optical measurements can be used as proxies of CDOM concentration. Whereas CDOM absorption measurements are given by the entire pool of the organic matter, FDOM measurements detect only sub-fractions. Depending on excitation and emission wavelengths of the fluorometer, FDOM can represent the fresh-material produced by microbial degradation of phytoplankton cells and/or from...
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Ano: 2017 URL: http://archimer.ifremer.fr/doc/00434/54541/55910.pdf
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Quality control for BGC-Argo radiometry ArchiMer
Poteau, Antoine; Organelli, Emanuele; Boss, Emmanuel; Xing, Xiaogang.
This document is the BGC-Argo quality control manual for radiometry observations. This first version of the document is to apply an initial QC to all radiometry values. Except for data failing the following tests, all the other values will be flagged as probably good data (‘2’). Probably good data need to be validated (i.e., flagged as good “1”) in delay mode.
Tipo: Text Palavras-chave: Argo; Physical oceanography; In-situ marine data; Profiling floats; Radiometry; Operational oceanography.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00513/62466/66773.pdf
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Retrieval of Particulate Backscattering Using Field and Satellite Radiometry: Assessment of the QAA Algorithm ArchiMer
Pitarch, Jaime; Bellacicco, Marco; Organelli, Emanuele; Volpe, Gianluca; Colella, Simone; Vellucci, Vincenzo; Marullo, Salvatore.
Particulate optical backscattering (bbp) is a crucial parameter for the study of ocean biology and oceanic carbon estimations. In this work, bbp retrieval, by the quasi-analytical algorithm (QAA), is assessed using a large in situ database of matched bbp and remote-sensing reflectance (Rrs). The QAA is also applied to satellite Rrs (ESA OC-CCI project) as well, after their validation against in situ Rrs. Additionally, the effect of Raman Scattering on QAA retrievals is studied. Results show negligible biases above random noise when QAA-derived bbp is compared to in situ bbp. In addition, Rrs from the CCI archive shows good agreement with in situ data. The QAA’s functional form of spectral backscattering slope, as derived from in situ radiometry, is...
Tipo: Text Palavras-chave: Particulate optical backscattering; Raman scattering; QAA algorithm; ESA OC-CCI.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00607/71889/70588.pdf
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