Spatial heterogeneity and environmental predictors of permafrost region soil organic carbon stocks


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umishra [ at ] sandia.gov

Abstract

Large stocks of soil organic carbon (SOC) have accumulated in the northern hemisphere permafrost region, but their current mounts and future fate remain uncertain. By analyzing an unprecedented dataset combining >2,700 soil profiles with environmental variables in a geospatial framework, we generated spatially explicit estimates of permafrost-region SOC stocks, quantified spatial heterogeneity, and identified key environmental predictors. We estimated 1014−175+194 Pg C are stored in the top 3 m of permafrost region soils. The greatest uncertainties occurred in circumpolar toe-slope positions and in flat areas of the Tibetan region. We found that soil wetness index and elevation are the dominant topographic controllers and surface air temperature (circumpolar region) and precipitation (Tibetan region) are significant climatic controllers of SOC stocks. Our results provide the first high-resolution geospatial assessment of permafrost region SOC stocks and their relationships with environmental factors, which are crucial for modeling the response of permafrost affected soils to changing climate.



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Article
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Primary Division
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ISI/Scopus peer-reviewed
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Published
Eprint ID
53729
DOI 10.1126/sciadv.aaz5236

Cite as
Mishra, U. , Hugelius, G. , Shelef, Y. , Yang, Y. , Strauss, J. , Lupachev, A. , Harden, J. , Jastrow, J. D. , Ping, C. L. , Riley, W. , Schuur, E. A. G. , Matamala, R. , Siewert, M. B. , Nave, L. , Koven, C. , Fuchs, M. , Palmtag, J. , Kuhry, P. , Treat, C. , Zubrzycki, S. , Hoffman, F. , Elberling, B. , Camill, P. , Veremeeva, A. A. and Orr, A. (2021): Spatial heterogeneity and environmental predictors of permafrost region soil organic carbon stocks , Science Advances . doi: 10.1126/sciadv.aaz5236


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Geographical region

Research Platforms

Campaigns
Arctic Land Expeditions > RU-Land_2015_CentralYakutia_Yukechi
Arctic Land Expeditions > AK-Land_2012_Itkillik
Arctic Land Expeditions > RU-Land_2007_Lena-transect
Arctic Land Expeditions > Laptev_Sea_2010
Arctic Land Expeditions > RU-Land_2010_Lena
Arctic Land Expeditions > RU-Land_2011_Lena
Arctic Land Expeditions > RU-Land_2012_Lena
Arctic Land Expeditions > RU-Land_2014_Lena_Sobo-Byk
Arctic Land Expeditions > RU-Land_2011_MamontovKlyk
Arctic Land Expeditions > RU-Land_2013_Pokhodsk

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info:eu-repo/grantAgreement/EC/H2020/851181


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