FN Archimer Export Format PT J TI Assessing the Variability in the Relationship Between the Particulate Backscattering Coefficient and the Chlorophyll a Concentration From a Global Biogeochemical-Argo Database BT AF BARBIEUX, Marie UITZ, Julia BRICAUD, Annick ORGANELLI, Emanuele POTEAU, Antoine SCHMECHTIG, Catherine GENTILI, Bernard OBOLENSKY, Grigor LEYMARIE, Edouard PENKERC'H, Christophe D'ORTENZIO, Fabrizio CLAUSTRE, Herve AS 1:1;2:1;3:1;4:1,2;5:1;6:3,4;7:1;8:5;9:1;10:1;11:1;12:1; FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:; C1 UPMC Univ Paris 06, Sorbonne Univ, CNRS, Observ Oceanol Villefranche,Lab Oceanog Villefran, Villefranche Sur Mer, France. Plymouth Marine Lab, Prospect Pl, Plymouth, Devon, England. CNRS, UMS 3455, OSU Ecce Terra, Paris, France. Univ Pierre & Marie Curie Paris 6, Paris, France. ERIC Euro Argo, F-29280 Plouzane, France. C2 UNIV PARIS 06, FRANCE PML, UK CNRS, FRANCE UNIV PARIS 6, FRANCE ERIC EURO ARGO, FRANCE IF 3.235 TC 52 UR https://archimer.ifremer.fr/doc/00673/78495/80780.pdf https://archimer.ifremer.fr/doc/00673/78495/80781.docx https://archimer.ifremer.fr/doc/00673/78495/80783.docx https://archimer.ifremer.fr/doc/00673/78495/80784.docx https://archimer.ifremer.fr/doc/00673/78495/80785.xlsx https://archimer.ifremer.fr/doc/00673/78495/80786.xlsx https://archimer.ifremer.fr/doc/00673/78495/80787.xlsx LA English DT Article CR OISO - OCÉAN INDIEN SERVICE D'OBSERVATION AB Characterizing phytoplankton distribution and dynamics in the world's open oceans requires in situ observations over a broad range of space and time scales. In addition to temperature/salinity measurements, Biogeochemical-Argo (BGC-Argo) profiling floats are capable of autonomously observing at high-frequency bio-optical properties such as the chlorophyll fluorescence, a proxy of the chlorophyll a concentration (Chla), the particulate backscattering coefficient (b(bp)), a proxy of the stock of particulate organic carbon, and the light available for photosynthesis. We analyzed an unprecedented BGC-Argo database of more than 8,500 multivariable profiles collected in various oceanic conditions, from subpolar waters to subtropical gyres. Our objective is to refine previously established Chla versus b(bp) relationships and gain insights into the sources of vertical, seasonal, and regional variability in this relationship. Despite some regional, seasonal and vertical variations, a general covariation occurs at a global scale. We distinguish two main contrasted situations: (1) concomitant changes in Chla and b(bp) that correspond to actual variations in phytoplankton biomass, e.g., in subpolar regimes; (2) a decoupling between the two variables attributed to photoacclimation or changes in the relative abundance of nonalgal particles, e.g., in subtropical regimes. The variability in the b(bp):Chla ratio in the surface layer appears to be essentially influenced by the type of particles and by photoacclimation processes. The large BGC-Argo database helps identifying the spatial and temporal scales at which this ratio is predominantly driven by one or the other of these two factors. PY 2018 PD FEB SO Journal Of Geophysical Research-oceans SN 2169-9275 PU Amer Geophysical Union VL 123 IS 2 UT 000427970400030 BP 1229 EP 1250 DI 10.1002/2017JC013030 ID 78495 ER EF