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Poster (Scientific congresses and symposiums)
On the coupling of primary production and calcification during a field experiment in the northeastern Atlantic
Chou, Lei; Harlay, Jérôme; Roevros, Nathalie et al.
2003EGS-AGU-EUG Joint Assembly
 

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Abstract :
[en] The role of calcifying phytoplanktonic organisms in ocean carbon biogeochemistry and in climate change has received increasing attention in the marine community. The quantification of the production of biogenic calcium carbonate and associated organic matter in the photic zone and of their fate during settling is essential for a better assessment of the oceanic carbon cycle. In the framework of the Belgian global change programme, we conducted a field experiment on board the R/V Belgica in Spring 2002 along the Northern Bay of Biscay margin during successive coccolithophorid Emiliania huxleyi (Ehux) blooms. We aim, in particular, at quantifying the role of calcifying phytoplanktonic organisms in sequestering carbon. With near real-time transmission of remote sensing data during the survey, we were able to track the position and evolution of the various coccolithophore blooms along the shelf break. Bio-optical measurements were performed for modelling purpose and for calibration of the recently launched MERIS Sensor. During the field campaign, special attention was paid to the precise determination of the dissolved inorganic carbon chemistry. Primary production and rate of calcification were measured using C14 incorporation experiments and the organic to inorganic particulate carbon ratio quantified. Phytoplankton speciation was determined by microscopic examination, flow cytometry and HPLC pigment analyses. Zooplankton grazing experiments on phytoplankton were also performed. Suspended particles were characterised by their chemical composition and morphology. Th234 was used to quantify particle residence times and particulate organic carbon fluxes in surface waters. The results indicate significant particle export during the sampling period, with particle residence times in the upper 80 m ranging from 15 to 45 days. In this presentation, we will integrate the results obtained from remote sensing, biooptical investigation, water chemistry and process studies to elucidate the coupling of primary production and calcification during Ehux blooms and its importance in the marine biogeochemical cycle of carbon.
Disciplines :
Environmental sciences & ecology
Aquatic sciences & oceanology
Author, co-author :
Chou, Lei;  Laboratoire d’Océanographie Chimique et Géochimie des Eaux, Faculté des Sciences, Université Libre de Bruxelles, B-1050 Brussels, Belgium
Harlay, Jérôme ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique
Roevros, Nathalie;  Laboratoire d’Océanographie Chimique et Géochimie des Eaux, Faculté des Sciences, Université Libre de Bruxelles, B-1050 Brussels, Belgium
Wollast, Roland;  Laboratoire d’Océanographie Chimique et Géochimie des Eaux, Faculté des Sciences, Université Libre de Bruxelles, B-1050 Brussels, Belgium
Delille, Bruno  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique
Aerts, Katrien;  Micro and Trace Analysis Centre (MiTAC), Universiteit Antwerpen, B-2610 Antwerp, Belgium
Lapernat, Pascale-Emmanuelle;  Laboratorium voor Ecologie en Systematiek,ECOL, Vrij Universiteit Brussel, B-1050 Brussels, Belgium
Smyth, Tim;  Remote Sensing Group, Plymouth Marine Laboratory, Plymouth PL1 3DH, United Kingdom
Schmidt, Sabine;  EPOC, UMR 5805, Université Bordeaux 1, Talence, France
Language :
English
Title :
On the coupling of primary production and calcification during a field experiment in the northeastern Atlantic
Publication date :
06 April 2003
Event name :
EGS-AGU-EUG Joint Assembly
Event organizer :
http://www.egu.eu/
Event place :
Nice, France
Event date :
6-11 April 2003
Audience :
International
Available on ORBi :
since 05 January 2011

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