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How snow affects air-sea ice CO2 fluxes
Delille, Bruno  ; Kotovitch, Marie  ; Van Der Linden, Fanny  et al.
2014 • Workshop on Chemical Atmosphere-Snow-Sea Ice Interaction (CASSII)
 

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Abstract :
[en] Sea ice is a significant contributor to the sink of atmospheric CO2 by polar oceans. Physical and biogeochemical sea ice processes affect partial pressure of CO2 within sea ice, that in turn controls the way and magnitude of air-sea ice CO2 fluxes. Snow cover appears to affect the magnitude of the fluxes. In order to understand the role of snow, we compared chamber and micrometeorological measurements of air-ice CO2 fluxes over snow covered and uncovered sea ice (land fast and pack ice) in both arctic and antarctic. We observed significant differences between fluxes over uncovered and covered sea ice. In addition chamber and micrometeorological measurement show different patterns that are partially due to snow cover. By gathering these observations, we observed at least three effects of snow on air-ice CO2 fluxes. Snow appears to (i) act as transient CO2 reservoir (ii) affect thermal properties of the ice surface (iii) control gas transfer depending on snow structure (superimposed ice, slush).
Disciplines :
Earth sciences & physical geography
Author, co-author :
Delille, Bruno  ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique
Kotovitch, Marie ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique
Van Der Linden, Fanny ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique
Nomura, D
Champenois, Willy ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Unité d'Océanographie chimique (UOC)
Heinesch, Bernard ;  Université de Liège > Ingénierie des biosystèmes (Biose) > Echanges Ecosystèmes - Atmosphère
Geilfus, N.-X.
Zhou, Jiayun
Tison, J.-L.
Language :
English
Title :
How snow affects air-sea ice CO2 fluxes
Publication date :
October 2014
Event name :
Workshop on Chemical Atmosphere-Snow-Sea Ice Interaction (CASSII)
Event organizer :
British Antarctic Survey
Event place :
Cambridge, United Kingdom
Event date :
13-15 October, 2014
Audience :
International

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