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• W2139920198 abstract "Abstract. The annual variability of CO2 exchange in most ecosystems is primarily driven by the activities of plants and soil microorganisms. However, little is known about the carbon balance and its controlling factors outside the growing season in Arctic regions dominated by soil freeze/thaw processes, long-lasting snow cover, and several months of darkness. This study presents a complete annual cycle of the CO2 net ecosystem exchange (NEE) dynamics for a high Arctic tundra area at the west coast of Svalbard based on eddy covariance flux measurements. The annual cumulative CO2 budget is close to 0 g C m−2 yr−1, but displays a strong seasonal variability. Four major CO2 exchange seasons have been identified. (1) During summer (snow-free ground), the CO2 exchange occurs mainly as a result of biological activity, with a dominance of strong CO2 assimilation by the ecosystem. (2) The autumn (snow-free ground or partly snow-covered) is dominated by CO2 respiration as a result of biological activity. (3) In winter and spring (snow-covered ground), low but persistent CO2 release occurs, overlayed by considerable CO2 exchange events in both directions associated with high wind speed and changes of air masses and atmospheric air pressure. (4) The snow melt season (pattern of snow-free and snow-covered areas) is associated with both meteorological and biological forcing, resulting in a carbon uptake by the high Arctic ecosystem. Data related to this article are archived at http://doi.pangaea.de/10.1594/PANGAEA.809507." @default.
• W2139920198 created "2016-06-24" @default.
• W2139920198 creator A5000727064 @default.
• W2139920198 creator A5011080965 @default.
• W2139920198 creator A5045120084 @default.
• W2139920198 creator A5090160350 @default.
• W2139920198 date "2014-11-24" @default.
• W2139920198 modified "2023-09-30" @default.
• W2139920198 title "Annual CO&lt;sub&gt;2&lt;/sub&gt; budget and seasonal CO&lt;sub&gt;2&lt;/sub&gt; exchange signals at a high Arctic permafrost site on Spitsbergen, Svalbard archipelago" @default.
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• W2139920198 doi "https://doi.org/10.5194/bg-11-6307-2014" @default.
• W2139920198 hasPublicationYear "2014" @default.
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