The permafrost carbon inventory on the Tibetan Plateau: a new evaluation using deep sediment cores
The permafrost organic carbon (OC) stock is of global significance because of its large pool size and the potential positive feedback to climate warming. However, due to the lack of systematic field observations and appropriate upscaling methodologies, substantial uncertainties exist in the permafro...
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ftchiacadscibcas:oai:ir.ibcas.ac.cn:2S10CLM1/25159 2023-05-15T17:55:28+02:00 The permafrost carbon inventory on the Tibetan Plateau: a new evaluation using deep sediment cores Ding, Jinzhi Li, Fei Yang, Guibiao Chen, Leiyi Zhang, Beibei Liu, Li Fang, Kai Qin, Shuqi Chen, Yongliang Peng, Yunfeng Ji, Chengjun He, Honglin Smith, Pete Yang, Yuanhe 2016 http://ir.ibcas.ac.cn/handle/2S10CLM1/25159 https://doi.org/10.1111/gcb.13257 英语 eng WILEY GLOBAL CHANGE BIOLOGY http://ir.ibcas.ac.cn/handle/2S10CLM1/25159 doi:10.1111/gcb.13257 cn.org.cspace.api.content.CopyrightPolicy@6cf1464a alpine permafrost carbon-climate feedback deep sediment soil organic carbon stock support vector machine Biodiversity Conservation Ecology Environmental Sciences SOIL ORGANIC-CARBON CLIMATE-CHANGE VEGETATION STORAGE MATTER STOCKS CHINA PERFORMANCE ENRICHMENT PATTERNS Science Citation Index Expanded (SCI-EXPANDED) Article 期刊论文 2016 ftchiacadscibcas https://doi.org/10.1111/gcb.13257 2022-07-27T09:10:54Z The permafrost organic carbon (OC) stock is of global significance because of its large pool size and the potential positive feedback to climate warming. However, due to the lack of systematic field observations and appropriate upscaling methodologies, substantial uncertainties exist in the permafrost OC budget, which limits our understanding of the fate of frozen carbon in a warming world. In particular, the lack of comprehensive estimates of OC stocks across alpine permafrost means that current knowledge on this issue remains incomplete. Here, we evaluated the pool size and spatial variations of permafrost OC stock to 3m depth on the Tibetan Plateau by combining systematic measurements from a substantial number of pedons (i.e. 342 three-metre-deep cores and 177 50-cm-deep pits) with a machine learning technique (i.e. support vector machine, SVM). We also quantified uncertainties in permafrost carbon budget by conducting Monte Carlo simulations. Our results revealed that the combination of systematic measurements with the SVM model allowed spatially explicit estimates to be made. The OC density (OC amount per unit area, OCD) exhibited a decreasing trend from the south-eastern to the north-western plateau, with the exception that OCD in the swamp meadow was substantially higher than that in surrounding regions. Our results also demonstrated that Tibetan permafrost stored a large amount of OC in the top 3m, with the median OC pool size being 15.31 Pg C (interquartile range: 13.03-17.77Pg C). 44% of OC occurred in deep layers (i.e. 100-300cm), close to the proportion observed across the northern circumpolar permafrost region. The large carbon pool size together with significant permafrost thawing suggests a risk of carbon emissions and positive climate feedback across the Tibetan alpine permafrost region. Article in Journal/Newspaper permafrost Institute of Botany: IBCAS OpenIR (Chinese Academy Of Sciences) Global Change Biology 22 8 2688 2701 |
institution |
Open Polar |
collection |
Institute of Botany: IBCAS OpenIR (Chinese Academy Of Sciences) |
op_collection_id |
ftchiacadscibcas |
language |
English |
topic |
alpine permafrost carbon-climate feedback deep sediment soil organic carbon stock support vector machine Biodiversity Conservation Ecology Environmental Sciences SOIL ORGANIC-CARBON CLIMATE-CHANGE VEGETATION STORAGE MATTER STOCKS CHINA PERFORMANCE ENRICHMENT PATTERNS Science Citation Index Expanded (SCI-EXPANDED) |
spellingShingle |
alpine permafrost carbon-climate feedback deep sediment soil organic carbon stock support vector machine Biodiversity Conservation Ecology Environmental Sciences SOIL ORGANIC-CARBON CLIMATE-CHANGE VEGETATION STORAGE MATTER STOCKS CHINA PERFORMANCE ENRICHMENT PATTERNS Science Citation Index Expanded (SCI-EXPANDED) Ding, Jinzhi Li, Fei Yang, Guibiao Chen, Leiyi Zhang, Beibei Liu, Li Fang, Kai Qin, Shuqi Chen, Yongliang Peng, Yunfeng Ji, Chengjun He, Honglin Smith, Pete Yang, Yuanhe The permafrost carbon inventory on the Tibetan Plateau: a new evaluation using deep sediment cores |
topic_facet |
alpine permafrost carbon-climate feedback deep sediment soil organic carbon stock support vector machine Biodiversity Conservation Ecology Environmental Sciences SOIL ORGANIC-CARBON CLIMATE-CHANGE VEGETATION STORAGE MATTER STOCKS CHINA PERFORMANCE ENRICHMENT PATTERNS Science Citation Index Expanded (SCI-EXPANDED) |
description |
The permafrost organic carbon (OC) stock is of global significance because of its large pool size and the potential positive feedback to climate warming. However, due to the lack of systematic field observations and appropriate upscaling methodologies, substantial uncertainties exist in the permafrost OC budget, which limits our understanding of the fate of frozen carbon in a warming world. In particular, the lack of comprehensive estimates of OC stocks across alpine permafrost means that current knowledge on this issue remains incomplete. Here, we evaluated the pool size and spatial variations of permafrost OC stock to 3m depth on the Tibetan Plateau by combining systematic measurements from a substantial number of pedons (i.e. 342 three-metre-deep cores and 177 50-cm-deep pits) with a machine learning technique (i.e. support vector machine, SVM). We also quantified uncertainties in permafrost carbon budget by conducting Monte Carlo simulations. Our results revealed that the combination of systematic measurements with the SVM model allowed spatially explicit estimates to be made. The OC density (OC amount per unit area, OCD) exhibited a decreasing trend from the south-eastern to the north-western plateau, with the exception that OCD in the swamp meadow was substantially higher than that in surrounding regions. Our results also demonstrated that Tibetan permafrost stored a large amount of OC in the top 3m, with the median OC pool size being 15.31 Pg C (interquartile range: 13.03-17.77Pg C). 44% of OC occurred in deep layers (i.e. 100-300cm), close to the proportion observed across the northern circumpolar permafrost region. The large carbon pool size together with significant permafrost thawing suggests a risk of carbon emissions and positive climate feedback across the Tibetan alpine permafrost region. |
format |
Article in Journal/Newspaper |
author |
Ding, Jinzhi Li, Fei Yang, Guibiao Chen, Leiyi Zhang, Beibei Liu, Li Fang, Kai Qin, Shuqi Chen, Yongliang Peng, Yunfeng Ji, Chengjun He, Honglin Smith, Pete Yang, Yuanhe |
author_facet |
Ding, Jinzhi Li, Fei Yang, Guibiao Chen, Leiyi Zhang, Beibei Liu, Li Fang, Kai Qin, Shuqi Chen, Yongliang Peng, Yunfeng Ji, Chengjun He, Honglin Smith, Pete Yang, Yuanhe |
author_sort |
Ding, Jinzhi |
title |
The permafrost carbon inventory on the Tibetan Plateau: a new evaluation using deep sediment cores |
title_short |
The permafrost carbon inventory on the Tibetan Plateau: a new evaluation using deep sediment cores |
title_full |
The permafrost carbon inventory on the Tibetan Plateau: a new evaluation using deep sediment cores |
title_fullStr |
The permafrost carbon inventory on the Tibetan Plateau: a new evaluation using deep sediment cores |
title_full_unstemmed |
The permafrost carbon inventory on the Tibetan Plateau: a new evaluation using deep sediment cores |
title_sort |
permafrost carbon inventory on the tibetan plateau: a new evaluation using deep sediment cores |
publisher |
WILEY |
publishDate |
2016 |
url |
http://ir.ibcas.ac.cn/handle/2S10CLM1/25159 https://doi.org/10.1111/gcb.13257 |
genre |
permafrost |
genre_facet |
permafrost |
op_relation |
GLOBAL CHANGE BIOLOGY http://ir.ibcas.ac.cn/handle/2S10CLM1/25159 doi:10.1111/gcb.13257 |
op_rights |
cn.org.cspace.api.content.CopyrightPolicy@6cf1464a |
op_doi |
https://doi.org/10.1111/gcb.13257 |
container_title |
Global Change Biology |
container_volume |
22 |
container_issue |
8 |
container_start_page |
2688 |
op_container_end_page |
2701 |
_version_ |
1766163413185069056 |