Poster (Scientific congresses and symposiums)
Biogeochemistry and carbon budget during a coccolithophorid bloom in the northern Bay of Biscay (June 2006)
Harlay, Jérôme; Borges, Alberto; De Bodt, Caroline et al.
2009EGU General Assembly
 

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Abstract :
[en] Carbon cycling processes (primary production (PPp), calcification (CAL), bacterial production and pelagic community respiration (PCR)) and variables (partial pressure of CO2 (pCO2) and total alkalinity (TA)) were measured in early June 2006 at several stations in the northern Bay of Biscay. These measurements were characterized with respect to the coccolithophorid blooming (growth or decline) based on satellite remote sensing (high reflectance (HR)) and other biogeochemical measurements i.e. inorganic nutrients, chlorophyll-a (Chl-a), phaeopigments (Phaeo), particulate inorganic carbon (PIC), particulate organic carbon (POC) and particulate nitrogen (PN)). The major HR patch was located over the shelf, along the continental margin and corresponded to declining bloom conditions characterized by moderate Chl-a <1.0 µg L-1, dissolved phosphate (PO4) depletion, low (<2.0 µmol L-1) dissolved silicate (DSi), low potential primary production (<0.25 µmol C L-1 h-1) and calcification rates (0.02-0.10 µmol C L-1 h-1). Yet, surface waters were undersaturated in CO2 with respect to atmospheric equilibrium. We present a coherent scheme of the C dynamics of a coccolithophorid bloom along the continental margin of the Bay of Biscay, an active hydrodynamic area, based on standing stocks and processes including 14C-based particulate primary production, CAL and PCR. A carbon budget obtained by integrating PPp, CAL and PCR over the water column highlights the importance of C extracellular production to sustain the bacterial demand in the twilight zone, which has also several repercussions on the fate of organic and inorganic C production in the photic zone during the different stages of the bloom.
Disciplines :
Aquatic sciences & oceanology
Environmental sciences & ecology
Author, co-author :
Harlay, Jérôme ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique
Borges, Alberto  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique
De Bodt, Caroline;  Laboratoire d’Océanographie Chimique et Géochimie des Eaux, Faculté des Sciences, Université Libre de Bruxelles, B-1050 Brussels, Belgium
d'Hoop, Quentin;  Laboratoire d’Océanographie Chimique et Géochimie des Eaux, Faculté des Sciences, Université Libre de Bruxelles, B-1050 Brussels, Belgium
Piontek, Judith;  Alfred Wegener Institute for Polar and Marine Research, D-27515 Bremerhaven, Germany
Roevros, Nathalie;  Laboratoire d’Océanographie Chimique et Géochimie des Eaux, Faculté des Sciences, Université Libre de Bruxelles, B-1050 Brussels, Belgium
Suykens, Kim;  Unité d’Océanographie Chimique, Université de Liège, B-4000 Liège, Belgium
Van Oostende, Nicolas;  Protistologie & Aquatische Ecologie, Universiteit Gent, B-9000 Gent, Belgium
Engel, Anja;  Alfred Wegener Institute for Polar and Marine Research, D-27515 Bremerhaven, Germany
Groom, Steve;  Remote Sensing Group, Plymouth Marine Laboratory, Plymouth PL1 3DH, United Kingdom
Sabbe, Koen;  Protistologie & Aquatische Ecologie, Universiteit Gent, B-9000 Gent, Belgium
Chou, Lei;  Laboratoire d’Océanographie Chimique et Géochimie des Eaux, Faculté des Sciences, Université Libre de Bruxelles, B-1050 Brussels, Belgium
Language :
English
Title :
Biogeochemistry and carbon budget during a coccolithophorid bloom in the northern Bay of Biscay (June 2006)
Publication date :
19 April 2009
Event name :
EGU General Assembly
Event organizer :
http://www.egu.eu/
Event place :
Vienna, Austria
Event date :
19-24 April 2009
Audience :
International
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since 05 January 2011

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