Reference : Antarctic landfast sea ice: autotrophy vs heterotrophy, sink vs source of CO2
Scientific congresses and symposiums : Unpublished conference/Abstract
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
http://hdl.handle.net/2268/227287
Antarctic landfast sea ice: autotrophy vs heterotrophy, sink vs source of CO2
English
Van der Linden, Fanny mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Chemical Oceanography Unit (AGO) >]
Moreau, Sébastien mailto [Norwegian Polar Institute > > > >]
Champenois, Willy mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Chemical Oceanography Unit (AGO) >]
Heinesch, Bernard mailto [Université de Liège - ULiège > Ingénierie des biosystèmes (Biose) > Biosystems Dynamics and Exchanges >]
Kotovitch, Marie mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Chemical Oceanography Unit (AGO) >]
Carnat, Gauthier mailto [Université Libre de Bruxelles - ULB > > > >]
Fripiat, François [Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Département de Biologie, Ecologie et Evolution >]
Deman, Florian mailto [Vrije Universiteit Brussel - VUB > Analytical, Environmental and Geo-Chemistry > > >]
Dehairs, Frank [Vrije Universiteit Brussel - VUB > > > >]
Haskell, Tim [Callaghan Innovation, New Zealand > > > >]
Tison, Jean-Louis mailto [Université Libre de Bruxelles - ULB > > > >]
Delille, Bruno mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
20-Jun-2018
No
No
International
Open Science Conference POLAR2018
18 juin 2018 au 23 juin 2018
SCAR/IASC
Davos
Suisse
[en] Sea ice is a biome actively participating in the regional cycling of CO2 as both a source and a sink at different times of the year depending on its trophic status (autotrophic vs heterotrophic). In the frame of the YROSIAE project (Year-Round survey of Ocean-Sea-Ice-Atmosphere Exchanges), carried out at Cape Evans in McMurdo Sound (Antarctica) from Nov. 2011 to Dec. 2012, ice cores, seawater, and brines were collected at regular time intervals. We used dissolved inorganic carbon (DIC) and chlorophyll-a (chl-a) as proxies of net community production and autotrophic biomass, respectively. From spring, very high chl-a concentrations (>2400𝜇𝑔.𝐿!!) were observed at the bottom of the ice. This suggests high primary production. Strikingly, at the same time, nutrients increased significantly indicating strong remineralization at the bottom. In the ice interior, evolution of DIC was marked by a succession of autotrophic and heterotrophic phases. The overall increase of DIC suggests that the ice interior was rather heterotroph. Such sea ice system should expel CO2. Yet, strong under-saturation in CO2 and DIC depletion appeared at the ice surface, suggesting that sea ice should take up CO2 from the atmosphere. On the whole, land fast sea ice in McMurdo Sound appears as a puzzling ecosystem. High primary production and remineralization develop simultaneously at the bottom while the top of the ice is rather heterotrophic but still able to pump CO2 from the atmosphere.
http://hdl.handle.net/2268/227287

There is no file associated with this reference.

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.