A comparison of annual and seasonal carbon dioxide effluxes between sub-Arctic Sweden and High-Arctic Svalbard

Polar research

Robert G. Björk²  Elke Morgner³  Bo Elberling³  Elisabeth J. Cooper⁵  Mats P. Björkman⁶  Leif Klemedtsson⁷ 

[1] Department of Geography and Geology, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K., Denmark;The University Centre in Svalbard, NO-9171 Longyearbyen, Norway;Department of Arctic and Marine Biology, University of Tromsø, NO-9037 Tromsø, Norway;Department of Plant and Environmental Sciences, University of Gothenburg, PO Box 461, SE-405 30 Gothenburg, Sweden;Department of Plant and Environmental Sciences, University of Gothenburg, PO Box 461, SE-405 30 Gothenburg, SwedenCorrespondence;Norwegian Polar Institute, Polar Environmental Centre, NO-9296 Tromsø, Norway;The University Centre in Svalbard, NO-9171 Longyearbyen, Norway

关键词: Arctic;    carbon dioxide;    snow;    soil respiration;    tundra;    winter;   

DOI  :  10.1111/j.1751-8369.2010.00150.x

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

Recent climate change predictions suggest altered patterns of winter precipitation across the Arctic. It has been suggested that the presence, timing and quantity of snow all affect microbial activity, thus influencing CO2 production in soil. In this study annual and seasonal emissions of CO2 were estimated in High-Arctic Adventdalen, Svalbard, and sub-Arctic Latnjajaure, Sweden, using a new trace gas-based method to track real-time diffusion rates through the snow. Summer measurements from snow-free soils were made using a chamber-based method. Measurements were obtained from different snow regimes in order to evaluate the effect of snow depth on winter CO2 effluxes. Total annual emissions of CO2 from the sub-Arctic site (0.662-1.487 kg CO2 m-2 yr-1) were found to be more than double the emissions from the High-Arctic site (0.369-0.591 kg CO2 m-2 yr-1). There were no significant differences in winter effluxes between snow regimes or vegetation types, indicating that spatial variability in winter soil CO2...

【 授权许可】

CC BY-NC