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The role of snow cover affecting boreal-arctic soil freeze – thaw and carbon dynamics
| Content Provider | Semantic Scholar |
|---|---|
| Author | Yi, Yonghong Moghaddam, Masood |
| Copyright Year | 2015 |
| Abstract | Northern Hemisphere permafrost affected land ar eas contain abont twice as mnch carbon as the global at mosphere. This vast carbon pool is vnlnerable to acceler ated losses throngh mobilization and decomposition nnder projected global warming. Satellite data records sparming the past 3 decades indicate widespread redactions ( ~ 0.81.3 days decade “ ̂ ) in the mean aimnal snow cover extent and frozen-season dnration across the pan-Arctic domain, coinci dent with regional climate warming trends. How the soil car bon pool responds to these changes will have a large impact on regional and global climate. Here, we developed a conpled terrestrial carbon and hydrology model framework with a de tailed 1-D soil heat transfer representation to investigate the sensitivity of soil organic carbon stocks and soil decompo sition to climate warming and changes in snow cover condi tions in the pan-Arctic region over the past 3 decades (19822010). Om resnlts indicate widespread soil active layer deep ening across the pan-Arctic, with a mean decadal trend of 6.6 ± 12.0 (SD) cm, corresponding to widespread warming. Warming promotes vegetation growth and soil heterotrophic respiration particnlarly within snrface soil layers (< 0.2 m). The model simnlations also show that seasonal snow cover has a large impact on soil temperatmes, whereby increases in snow cover promote deeper (> 0.5 m) soil layer warm ing and soil respiration, while inhibiting soil decomposition from snrface (< 0.2 m) soil layers, especially in colder cli mate zones (mean armnal T < -10°C ). Onr resnlts demon strate the important control of snow cover on northem soil freeze-thaw and soil carbon decomposition processes and the necessity of considering both warming and a change in precipitation and snow cover regimes in characterizing per mafrost soil carbon dynamics. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://scholarworks.umt.edu/cgi/viewcontent.cgi?article=1308&context=ntsg_pubs |
| Alternate Webpage(s) | https://www.geo.umass.edu/climate/papers2/Yi_BG_2015.pdf |
| Alternate Webpage(s) | http://scholarworks.umt.edu/cgi/viewcontent.cgi?article=1308&context=ntsg_pubs |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | File spanning Global Warming Köppen climate classification Permafrost Projections and Predictions Simulation Terrestrial television anatomical layer |
| Content Type | Text |
| Resource Type | Article |
