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TI Biological production in two contrasted regions of the Mediterranean Sea during the oligotrophic period: An estimate based on the diel cycle of optical properties measured by BGC-Argo profiling floats
BT 
AF Barbieux, Marie
   Uitz, Julia
   Mignot, Alexandre
   Roesler, Collin
   Claustre, Hervé
   Gentili, Bernard
   Taillandier, Vincent
   D'Ortenzio, Fabrizio
   Loisel, Hubert
   Poteau, Antoine
   Leymarie, Edouard
   Penkerc'h, Christophe
   Schmechtig, Catherine
   Bricaud, Annick
AS 1:1;2:1;3:2;4:3;5:1;6:1;7:1;8:1;9:4;10:1;11:1;12:1;13:5;14:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;14:;
C1 CNRS and Sorbonne Université, Laboratoire d’Océanographie de Villefranche, LOV, 06230 Villefranche-sur-Mer, France
   Mercator Océan, 31520 Ramonville-Saint-Agne, France
   Bowdoin College, Earth and Oceanographic Science, Brunswick, Maine 04011, USA
   Université Littoral Côte d’Opale, Université Lille, CNRS, Laboratoire d’Océanologie et de Géosciences, 59000 Lille, France
   OSU Ecce Terra, UMS 3455, CNRS and Sorbonne Université, Paris 6, 4 place Jussieu, 75252 Paris CEDEX 05, France
C2 UNIV SORBONNE, FRANCE
   MERCATOR OCEAN, FRANCE
   BOWDOIN COLL, USA
   UNIV LITTORAL COTE D’OPALE, FRANCE
   UNIV SORBONNE, FRANCE
IN DOAJ
TC 0
UR https://archimer.ifremer.fr/doc/00750/86247/91546.pdf
   https://archimer.ifremer.fr/doc/00750/86247/93443.pdf
LA English
DT Article
CR BOUSSOLE
   PEACETIME
BO Pourquoi pas ?
AB This study assesses marine biological production of organic carbon based on the diel variability of bio-optical properties monitored by two BioGeoChemical-Argo (BGC-Argo) floats. Experiments were conducted in two distinct Mediterranean systems, the Northwestern Ligurian Sea and the Central Ionian Sea during summer months. We derived particulate organic carbon (POC) stock and gross community production integrated within the surface, euphotic and subsurface chlorophyll maximum (SCM) layers, using an existing approach applied to diel cycle measurements of the particulate beam attenuation (cp) and backscattering (bbp) coefficients. The diel cycle of cp provided a robust proxy for quantifying biological production in both systems; that of bbp was comparatively less robust. Derived primary production estimates vary by a factor of 2 depending upon the choice of the bio-optical relationship that converts the measured optical coefficient to POC, which is thus a critical step to constrain. Our results indicate a substantial, yet variable, contribution to the water column production of the SCM layer (16–42%). In the Ligurian Sea, the SCM is a seasonal feature that behaves as a subsurface biomass maximum (SBM) with the ability to respond to episodic abiotic forcing by increasing production. In contrast, in the Ionian Sea, the SCM is permanent, induced by phytoplankton photoacclimation and contributes moderately to water column production. These results emphasize the strong potential for transmissometers deployed on BGC-Argo profiling floats to quantify non-intrusively in situ biological production of organic carbon in the water column of stratified oligotrophic systems with recurring or permanent SCMs, which are widespread features in the global ocean. 
PY 2022
SO Biogeosciences
SN 1726-4189
PU Copernicus GmbH
VL 19
IS 4
BP 1165
EP 1194
DI 10.5194/bg-2021-123
ID 86247
ER

EF