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DOI	10.5194/tc-9-1701-2015
	Winter observations of CO2 exchange between sea ice and the atmosphere in a coastal fjord environment
	Sievers J.; Sørensen L.L.; Papakyriakou T.; Else B.; Sejr M.K.; Haubjerg Søgaard D.; Barber D.; Rysgaard S.
发表日期	2015
ISSN	19940416
卷号	9 期号:4
英文摘要	Eddy covariance observations of CO2 fluxes were conducted during March-April 2012 in a temporally sequential order for 8, 4 and 30 days, respectively, at three locations on fast sea ice and on newly formed polynya ice in a coastal fjord environment in northeast Greenland. CO2 fluxes at the sites characterized by fast sea ice (ICEI and DNB) were found to increasingly reflect periods of strong outgassing in accordance with the progression of springtime warming and the occurrence of strong wind events: FCO2ICE1 = 1.73 ± 5 mmol m-2 day-1 and FCO2DNB = 8.64 ± 39.64 mmol m-2 day-1, while CO2 fluxes at the polynya site (POLYI) were found to generally reflect uptake FCO2POLY1 = -9.97 ± 19.8 mmol m-2 day-1. Values given are the mean and standard deviation, and negative/positive values indicate uptake/outgassing, respectively. A diurnal correlation analysis supports a significant connection between site energetics and CO2 fluxes linked to a number of possible thermally driven processes, which are thought to change the pCO2 gradient at the snow-ice interface. The relative influence of these processes on atmospheric exchanges likely depends on the thickness of the ice. Specifically, the study indicates a predominant influence of brine volume expansion/contraction, brine dissolution/concentration and calcium carbonate formation/dissolution at sites characterized by a thick sea-ice cover, such that surface warming leads to an uptake of CO2 and vice versa, while convective overturning within the sea-ice brines dominate at sites characterized by comparatively thin sea-ice cover, such that nighttime surface cooling leads to an uptake of CO2 to the extent permitted by simultaneous formation of superimposed ice in the lower snow column. © Author(s) 2015.
学科领域	air-sea interaction; atmosphere; brine; canonical analysis; carbon dioxide; carbon flux; coastal zone; concentration (composition); eddy covariance; fjord; net ecosystem exchange; phase transition; polynya; sea ice; spatiotemporal analysis; thermal convection; winter; Arctic; Greenland
语种	英语
scopus关键词	air-sea interaction; atmosphere; brine; canonical analysis; carbon dioxide; carbon flux; coastal zone; concentration (composition); eddy covariance; fjord; net ecosystem exchange; phase transition; polynya; sea ice; spatiotemporal analysis; thermal convection; winter; Arctic; Greenland
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119828
作者单位	Department of Environmental Science, Aarhus University, Roskilde, 4000, Denmark; Department of Bioscience, Aarhus University, Silkeborg, 8600, Denmark; Arctic Research Centre, Aarhus University, Aarhus, 8000, Denmark; Greenland Climate Research Centre, C/o Greenland Institute of Natural Resources, box 570, Nuuk, Greenland; Centre for Earth Observation Science, CHR Faculty of Environment Earth and Resources, University of Manitoba, 499 Wallace Building, Winnipeg, MB R3T 2N2, Canada; Department of Geological Sciences, University of Manitoba, Winnipeg, MB R3T 2N2, Canada; Department of Geography, University of Calgary, Calgary, AB T2N 1N4, Canada; Department of Biology, University of Southern Denmark, Campusvej 55, Odense M, 5230, Denmark
推荐引用方式 GB/T 7714	Sievers J.,Sørensen L.L.,Papakyriakou T.,et al. Winter observations of CO2 exchange between sea ice and the atmosphere in a coastal fjord environment[J],2015,9(4).
APA	Sievers J..,Sørensen L.L..,Papakyriakou T..,Else B..,Sejr M.K..,...&Rysgaard S..(2015).Winter observations of CO2 exchange between sea ice and the atmosphere in a coastal fjord environment.Cryosphere,9(4).
MLA	Sievers J.,et al."Winter observations of CO2 exchange between sea ice and the atmosphere in a coastal fjord environment".Cryosphere 9.4(2015).