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Storage, patterns, and environmental controls of soil organic carbon stocks in the permafrost regions of the Northern Hemisphere

Wu, Tonghua ; Wang, Dong ; Mu, Cuicui ; Zhang, Wenxin LU orcid ; Zhu, Xiaofan ; Zhao, Lin ; Li, Ren ; Hu, Guojie ; Zou, Defu and Chen, Jie , et al. (2022) In Science of the Total Environment 828.
Abstract

Large stocks of soil organic carbon (SOC) accumulated in the Northern Hemisphere permafrost regions may be vulnerable to climatic warming, but global estimates of SOC distribution and magnitude in permafrost regions still have large uncertainties. Based on multiple high-resolution environmental variables and a compiled soil sample dataset (>3000 soil profiles), we used machine-learning methods to estimate the size and spatial distribution of SOC for the top 3 m soils in the Northern Hemisphere permafrost regions. We also identified key environmental predictors of SOC. The results showed that the SOC storage for the top 3 m soil was 1079 ± 174 Pg C across the Northern Hemisphere permafrost regions (20.8 × 106... (More)

Large stocks of soil organic carbon (SOC) accumulated in the Northern Hemisphere permafrost regions may be vulnerable to climatic warming, but global estimates of SOC distribution and magnitude in permafrost regions still have large uncertainties. Based on multiple high-resolution environmental variables and a compiled soil sample dataset (>3000 soil profiles), we used machine-learning methods to estimate the size and spatial distribution of SOC for the top 3 m soils in the Northern Hemisphere permafrost regions. We also identified key environmental predictors of SOC. The results showed that the SOC storage for the top 3 m soil was 1079 ± 174 Pg C across the Northern Hemisphere permafrost regions (20.8 × 106 km2), including 1057 ± 167 Pg C in the northern permafrost regions and 22 ± 7 Pg C in the Third Pole permafrost regions. The mean annual air temperature and NDVI are the main controlling factors for the spatial distribution of SOC stocks in the northern and the Third Pole permafrost regions. Our estimations were more accurate than the existing global SOC stock maps. The results improve our understanding of the regional and global permafrost carbon cycle and their feedback to the climate system.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Machine learning, Northern Hemisphere, Permafrost, Soil organic carbon
in
Science of the Total Environment
volume
828
article number
154464
publisher
Elsevier
external identifiers
  • pmid:35278536
  • scopus:85126303370
ISSN
0048-9697
DOI
10.1016/j.scitotenv.2022.154464
language
English
LU publication?
yes
additional info
Funding Information: This work was supported by the National Key Research and Development Program of China ( 2020YFA0608501 , 2019YFA0607003 ), the National Natural Science Foundation of China ( 41941015 , 32061143032 , 41961144021 , 41931180 ), the grant from the Swedish Research Council VR 2020-05338, and the West Light Foundation of the Chinese Academy of Sciences . Publisher Copyright: © 2022 Elsevier B.V.
id
36cff977-b684-4ef3-b9aa-4d2f6ac2cb30
date added to LUP
2022-04-07 14:20:17
date last changed
2025-03-15 12:36:37
@article{36cff977-b684-4ef3-b9aa-4d2f6ac2cb30,
  abstract     = {{<p>Large stocks of soil organic carbon (SOC) accumulated in the Northern Hemisphere permafrost regions may be vulnerable to climatic warming, but global estimates of SOC distribution and magnitude in permafrost regions still have large uncertainties. Based on multiple high-resolution environmental variables and a compiled soil sample dataset (&gt;3000 soil profiles), we used machine-learning methods to estimate the size and spatial distribution of SOC for the top 3 m soils in the Northern Hemisphere permafrost regions. We also identified key environmental predictors of SOC. The results showed that the SOC storage for the top 3 m soil was 1079 ± 174 Pg C across the Northern Hemisphere permafrost regions (20.8 × 10<sup>6</sup> km<sup>2</sup>), including 1057 ± 167 Pg C in the northern permafrost regions and 22 ± 7 Pg C in the Third Pole permafrost regions. The mean annual air temperature and NDVI are the main controlling factors for the spatial distribution of SOC stocks in the northern and the Third Pole permafrost regions. Our estimations were more accurate than the existing global SOC stock maps. The results improve our understanding of the regional and global permafrost carbon cycle and their feedback to the climate system.</p>}},
  author       = {{Wu, Tonghua and Wang, Dong and Mu, Cuicui and Zhang, Wenxin and Zhu, Xiaofan and Zhao, Lin and Li, Ren and Hu, Guojie and Zou, Defu and Chen, Jie and Wei, Xianhua and Wen, Amin and Shang, Chengpeng and La, Yune and Lou, Peiqing and Ma, Xin and Wu, Xiaodong}},
  issn         = {{0048-9697}},
  keywords     = {{Machine learning; Northern Hemisphere; Permafrost; Soil organic carbon}},
  language     = {{eng}},
  month        = {{07}},
  publisher    = {{Elsevier}},
  series       = {{Science of the Total Environment}},
  title        = {{Storage, patterns, and environmental controls of soil organic carbon stocks in the permafrost regions of the Northern Hemisphere}},
  url          = {{http://dx.doi.org/10.1016/j.scitotenv.2022.154464}},
  doi          = {{10.1016/j.scitotenv.2022.154464}},
  volume       = {{828}},
  year         = {{2022}},
}