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Communications KEOPS2

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2013


Special session at the ASLO meeting

18-22 februrary 2013, New orleans, USA.


SS51: Iron, Carbon Cycling, and Ecosystem Dynamics in the Southern Ocean —

Conveners:Stephane Blain, Universite Pierre et Marie Curie, This e-mail address is being protected from spambots. You need JavaScript enabled to view it ; Queguiner, Universite d'Aix-Marseille, This e-mail address is being protected from spambots. You need JavaScript enabled to view it ; Strass, Alfred Wegener Institute for Polar and Marine Research, This e-mail address is being protected from spambots. You need JavaScript enabled to view it ; Dieter Wolf-Gladrow, Alfred Wegener Institute for Polar and Marine Research, This e-mail address is being protected from spambots. You need JavaScript enabled to view it

In the macronutrient-rich waters of the Southern Ocean, the biological pump of CO2 is likely controlled by the supply and bioavailability of iron. Through diverse interactions, iron limitation causes co-limitations principally by the light regime or by silicon. These processes are themselves modulated by the biological couplings in the food webs, and iron availability drives the functional structure and the biodiversity within the Southern Ocean ecosystems. Iron impacts the coupling between the different biogeochemical cycles with feedbacks on climate or on the productivity of adjacent ocean basins, possibly affecting the global carbon cycle. Resolving this complex multi-faceted story requires a large international effort which is underway. This session aims to bring together the most recent findings on the following issues: the impact of iron supply on carbon sequestration and atmospheric CO2 drawdown, the interaction between iron availability and the structure, biodiversity, and functioning of pelagic ecosystems, the identification of iron sources and transport pathways, the transformations of iron mediated by biotic or abiotic processes, and the coupling/decoupling between iron and major nutrient biogeochemical cycles. We invite submissions addressing any of these topics, either obtained from the most recent field studies (such as KEOPS2, or Eddy Pump), modeling studies or re-analysis of relevant previous observations.


Blain, S. SPATIAL AND TEMPORAL RESPONSES OF THE SOUTHERN OCEAN TO LARGE SCALE NATURAL IRON FERTILIZATION (KERGUELEN REGION) abstract, oral presentation

Zhou, M., d'Ovidio, F., Park, Y. H., Zhu, Y., Durand, I., Kestenare, E., Sanial, V., Van-Beek, P., Queguiner, B., Blain, S.,ESTIMATES OF HORIZONTAL SURFACE CIRCULATION AND UPWELLING USING SURFACE DRIFTERS IN KERGUELEN PLATEAU REGIONS DURING THE 2011 AUSTRAL SPRING CRUISE abstract, oral presentation

Bowie, A. R., Quéroué, F., Sarthou, G., Chever, F., van der Merwe, P., Bucciarelli, E., Townsend, A. T., Blain, S.,DISSOLVED AND PARTICULATE TRACE METALS IN THE VICINITY OF THE KERGUELEN ISLANDS, SOUTHERN OCEAN, DURING THE KEOPS 2 EXPERIMENT abstract, oral presentation

Sanial, V., van Beek, P., Lansard, B., Zhou, M., Kestenare, E., Souhaut, M., USE OF THE RADIUM QUARTET (223RA, 224RA, 226RA, 228RA) TO STUDY THE NATURAL IRON FERTILIZATION OFF CROZET AND KERGUELEN ISLANDS (SOUTHERN OCEAN) abstract, oral presentation

Lasbleiz, M., Closset, I.,Quéguiner, B., Leblanc, K., Cardinal, D., Navez, J.,SPECIES–SPECIFIC CONTRIBUTION OF DIATOMS TO SI PRODUCTION IN THE FE-FERTILIZED KERGUELEN REGION OF THE SOUTHERN OCEAN (KEOPS2) abstract, oral presentation

 Cavagna, A., Quéguiner, B., Planchon, F., Jacquet, S., Closset, I., Dehairs, F.,PRODUCTION REGIME AND POTENTIAL FOR CARBON EXPORT IN THE NATURALLY IRON FERTILIZED KERGUELEN AREA (SOUTHERN OCEAN) abstract, oral presentation

Closset, I., Lasbleiz, M., Leblanc, K., Quéguiner, B., Navez, J., Cardinal, D., COMPARISON OF SI BIOGEOCHEMICAL BUDGET IN CONTRASTED SOUTHERN OCEAN REGIONS THROUGH SILICA PRODUCTION-DISSOLUTION MEASUREMENTS (KEOPS-2) abstract, oral presentation

Dehairs, F., Trull, T. W., Fernandez, C., Davies, D., Cavagna, A. J., Piniella, A. E.,NITRATE ISOTOPIC COMPOSITION IN THE KERGUELEN AREA (SOUTHERN OCEAN) DURING KEOPS 2 abstract, oral presentation

Jouandet, M., guidi, L., carlotti, F., Stemmann, L., Picheral, M., Zhou, M., Trull, T., Blain, S.,PARTICLE SIZE DISTRIBUTIONS IN RESPONSE TO NATURAL IRON FERTILISATION IN THE SOUTHERN OCEAN (KERGUELEN ISLAND)-IMPLICATION FOR CARBON EXPORT. abstract, oral presentation

Zhu, Y., Zhou, M., Queguiner, B., Leblanc, K., Carlotti, F., Armand, L., Jouandet, M. P., Kestenare, E., Trull, T., Blain, S.,ESTIMATES OF PARTICLE SETTLING AND SCAVENGING USING LISST-LOPC IN KERGUELEN PLATEAU REGIONS DURING THE 2011 AUSTRAL SPRING KEOPS II CRUISE abstract, oral presentation

Jacquet, S. H., Dehairs, F., Cavagna, A. J., Planchon, F., Closset, I.,  Cardinal, D.,SEASONAL VARIABILITY OF MESOPELAGIC ORGANIC CARBON REMINERALIZATION IN THE NATURALLY IRON-FERTILIZED KERGUELEN AREA (SOUTHERN OCEAN) abstract, poster presentation

Carlotti, F., Nowaczyk, A., Jouandet, M. P., Lefèvre, D., Harmelin, M.,MESOZOOPLANKTON STRUCTURE AND FUNCTIONING DURING THE ONSET OF THE KERGUELEN SPRING BLOOM: FIRST RESULTS OF THE KEOPS2 SURVEY. abstract, poster presentation

González, M. L. Oriol, L., Dehairs, F., Cavagna, A. J., Fernandez, C.,MOLECULAR NITROGEN FIXATION IN THE SOUTHERN OCEAN: CASE OF STUDY OF THE FE-FERTILIZED KERGUELEN REGION (KEOPSII CRUISE) abstract, poster presentation




 

Cavagna A.-J., Dehairs F., Jacquet S., Planchon F. Primary production and potential for carbon export in naturally iron-fertized waters in the Southern Ocean.45th international Liège colloquium Liège Belgique, 13-17 may 2013.


Blain S. What is the upper limit for primary production in the Southern ocean?45th international Liège colloquium Liège Belgique, 13-17 may 2013


 D'Ovidio F.The structuring role of horizontal stirring on primary production. 45th international Liège colloquium Liège Belgique, 13-17 may 2013


 Pieter Van Beek, Virginie Sanial, Bruno Lansard, Marc Souhaut, Elodie Kestenare, Francesco d’Ovidio, Meng Zhou and Stéphane Blain. Study of the natural iron fertilization off Crozet and Kerguelen Islands (Southern Ocean) using radium isotopes as tracers. Goldschmidt Conference, abstract


 Sanial V., van Beek P. , Lansard B. , Souhaut M. , Zhou M., d’Ovidio F. , Kestenare E. and Blain S. Study of the natural fertilization off Kerguelen Islands (Southern Ocean) using radium isotopes, Goldschmidt Conference, Florence, Italy. poster


2012

 

Sarthou  G. , F. Queroué, F. Chever, A.R. Bowie, P. Van der merve, E. Bucciarelli, M. Fourquez , S. Blain.  Dissolved iron in the vicinity of the Kerguelen Islands, Southern Ocean, during the KEOPS 2 experiment.  Goldschmidt Conference, 24-29 June,  Montreal, Canada)


 D'Ovidio F., M. Zhou, Y.H. Park, F. Nencioli, , L. Resplandy, A. Doglioli, A. Petrenko, , B. Queguiner,  S. Blain , Guiding biogeochemical campaigns with high resolution altimetry: waiting for the SWOT mission conference "20 years of progress in radar altimetry", 24-29 September 2012 Venice, Italy. abstract.


Cavagna A.-J. , F. Dehairs, B. Quéguiner, C. Fernandez, M. Elskens, D. Lefèvre, Regimes of production and potential for carbon export in naturally iron-fertilized waters in the Southern Ocean, ASLO summer meeting, 8-13July, Shiga, Japan. abstract.


Lansard B,  Sanial V., Van Beek P., Souhaut M., D’Ovidio F. What do we learn from radium isotopes about natural iron fertilization off Crozet and Kerguelen Islands, Southern Ocean? 4th International Ra-Rn workshop June3-8 2012, Narragansett, RI, USA . abstract


Laurenceau, E., T. Trull, D. Davies, C. De La Rocha, S. Blain, Sinking velocity of marine aggregates, from simple theory to complex reality: insights from roller tank experiments in a naturally iron-fertilised area of the Southern Ocean. IWOMA 2012, 2nd international workshop on marine agregats, from molecular principles to biochemical impact, 15-17 august 2012, Bremen (Germany).abstract


Blain S. 2012 KEOPS2 Objectives and strategy, TANGGO meeting, 22-24 Mai, Grenoble (France).


Sanial.V, van Beek P., Lansard B. and Zhou M. Land-Ocean Connectivity: tracing and quantifying the iron input that fuels the phytoplankton blooms off Kerguelen and Crozet Islands. 24-27 Septembre 2012 - Aber Wrac'h, France - Land Ocean Connectivity: from hydrological to ecological understanding of groundwater effects in the coastal zone.


Communications at the international workshop

" diagnosis of vertical exchanges at submesoscales and their impact on ecosystems from integrated satelitte and in-situ observations.

28-29 Nov. 2012 Plouzané.

Blain S. strategies and implemention of pluridisciplinary cruises in the Southern ocean. (pdf)


Rio, M.H., Pujol, M.I., Faugere Y., D'Ovidio F. A new regional high resolution altimeter product for the KEOPS2 oceanographic campaign. (pdf)



 



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