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Substantial non-growing season carbon dioxide loss across Tibetan alpine permafrost region.
- Source :
-
Global change biology [Glob Chang Biol] 2022 Sep; Vol. 28 (17), pp. 5200-5210. Date of Electronic Publication: 2022 Jul 07. - Publication Year :
- 2022
-
Abstract
- One of the major uncertainties for projecting permafrost carbon (C)-climate feedback is a poor representation of the non-growing season carbon dioxide (CO <subscript>2</subscript> ) emissions under a changing climate. Here, combining in situ field observations, regional synthesis and a random forest model, we assessed contemporary and future soil respired CO <subscript>2</subscript> (i.e., soil respiration, R <subscript>s</subscript> ) across the Tibetan alpine permafrost region, which has received much less attention compared with the Arctic permafrost domain. We estimated the regional mean R <subscript>s</subscript> of 229.8, 72.9 and 302.7 g C m <superscript>-2</superscript>  year <superscript>-1</superscript> during growing season, non-growing season and the entire year, respectively; corresponding to the contemporary losses of 296.9, 94.3 and 391.2 Tg C year <superscript>-1</superscript> from this high-altitude permafrost-affected area. The non-growing season R <subscript>s</subscript> accounted for a quarter of the annual soil CO <subscript>2</subscript> efflux. Different from the prevailing view that temperature is the most limiting factor for cold-period CO <subscript>2</subscript> release in Arctic permafrost ecosystems, precipitation determined the spatial pattern of non-growing season R <subscript>s</subscript> on the Tibetan Plateau. Using the key predictors, model extrapolation demonstrated additional losses of 38.8 and 74.5 Tg C from the non-growing season for a moderate mitigation scenario and a business-as-usual emissions scenario, respectively. These results provide a baseline for non-growing season CO <subscript>2</subscript> emissions from high-altitude permafrost areas and help for accurate projection of permafrost C-climate feedback.<br /> (© 2022 John Wiley & Sons Ltd.)
- Subjects :
- Carbon Dioxide analysis
Ecosystem
Seasons
Soil
Tibet
Permafrost
Subjects
Details
- Language :
- English
- ISSN :
- 1365-2486
- Volume :
- 28
- Issue :
- 17
- Database :
- MEDLINE
- Journal :
- Global change biology
- Publication Type :
- Academic Journal
- Accession number :
- 35748703
- Full Text :
- https://doi.org/10.1111/gcb.16315