Spatiotemporal Variability and Sources of DIC in Permafrost Catchments of the Yangtze River Source Region: Insights From Stable Carbon Isotope and Water Chemistry
Riverine dissolved inorganic carbon (DIC) exports play a central role in the regional and global carbon cycles. Here, we investigated the spatiotemporal variability and sources of DIC in eight catchments in the Yangtze River source region (YRSR) with variable permafrost coverage and seasonally thawe...
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Online Access: | http://ir.imde.ac.cn/handle/131551/34167 https://doi.org/10.1029/2019WR025343 |
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ftchinacadscimhe:oai:ir.imde.ac.cn:131551/34167 2023-05-15T17:57:08+02:00 Spatiotemporal Variability and Sources of DIC in Permafrost Catchments of the Yangtze River Source Region: Insights From Stable Carbon Isotope and Water Chemistry Song, Chunlin Wang, Genxu Mao, Tianxu Huang, Kewei Sun, Xiangyang Hu, Zhaoyong Chang, Ruiying Chen, Xiaopeng Raymond, Peter A. 2020 http://ir.imde.ac.cn/handle/131551/34167 https://doi.org/10.1029/2019WR025343 英语 eng AMER GEOPHYSICAL UNION WATER RESOURCES RESEARCH http://ir.imde.ac.cn/handle/131551/34167 doi:10.1029/2019WR025343 DISSOLVED INORGANIC CARBON TIBETAN PLATEAU ORGANIC-CARBON CO2 CONSUMPTION FLUVIAL GEOCHEMISTRY EASTERN SIBERIA CLIMATE-CHANGE GAS-EXCHANGE THAW DEPTH DIOXIDE Environmental Sciences & Ecology Marine & Freshwater Biology Water Resources Environmental Sciences Limnology 期刊论文 2020 ftchinacadscimhe https://doi.org/10.1029/2019WR025343 2022-12-19T18:23:09Z Riverine dissolved inorganic carbon (DIC) exports play a central role in the regional and global carbon cycles. Here, we investigated the spatiotemporal variability and sources of DIC in eight catchments in the Yangtze River source region (YRSR) with variable permafrost coverage and seasonally thawed active layers. The YRSR catchments are DIC-rich (averagely 25 mg C L-1) and export 3.51 g m(-2) yr(-1) of DIC. The seasonal changes of temperature, active layer, flow path, and discharge can alter DIC and stable carbon isotope of DIC (delta C-13-DIC). The most depleted delta C-13-DIC values were found in the thawed period, suggesting the soil-respired CO2 during the active layer thaw period can promote bicarbonate production via H2CO3 weathering. Spatially, delta C-13-DIC values increased downstream, likely due to CO2 outgassing and changed permafrost coverage and runoff. We found that evaporite dissolution and silicate weathering in the seasonally thawed active layer contributed 44.2% and 30.9% of stream HCO3-, respectively, while groundwater and rainwater contributed 16.7% and 7.3% of HCO3-, respectively. Pure carbonate rock weathering played a negligible role in DIC production. These results were compatible with delta C-13-DIC source approximation results. Silicate weathering increased from initial thaw to thawed period, reflecting the active layer thaw and subsequent hydrology change impacts. Silicate weathering consumed 1.25 x 10(10) mol of CO2 annually, while evaporite dissolution may produce CO2 and neutralize this CO2 sink. This study provides new understanding of the riverine DIC export processes of the YRSR. As permafrost degrades, the quantity, sources, and sinks of riverine DIC may also change spatiotemporally. Report permafrost Siberia IMHE OpenIR (Institute of Mountain Hazards and Environment, Chinese Academy of Sciences) Water Resources Research 56 1 |
institution |
Open Polar |
collection |
IMHE OpenIR (Institute of Mountain Hazards and Environment, Chinese Academy of Sciences) |
op_collection_id |
ftchinacadscimhe |
language |
English |
topic |
DISSOLVED INORGANIC CARBON TIBETAN PLATEAU ORGANIC-CARBON CO2 CONSUMPTION FLUVIAL GEOCHEMISTRY EASTERN SIBERIA CLIMATE-CHANGE GAS-EXCHANGE THAW DEPTH DIOXIDE Environmental Sciences & Ecology Marine & Freshwater Biology Water Resources Environmental Sciences Limnology |
spellingShingle |
DISSOLVED INORGANIC CARBON TIBETAN PLATEAU ORGANIC-CARBON CO2 CONSUMPTION FLUVIAL GEOCHEMISTRY EASTERN SIBERIA CLIMATE-CHANGE GAS-EXCHANGE THAW DEPTH DIOXIDE Environmental Sciences & Ecology Marine & Freshwater Biology Water Resources Environmental Sciences Limnology Song, Chunlin Wang, Genxu Mao, Tianxu Huang, Kewei Sun, Xiangyang Hu, Zhaoyong Chang, Ruiying Chen, Xiaopeng Raymond, Peter A. Spatiotemporal Variability and Sources of DIC in Permafrost Catchments of the Yangtze River Source Region: Insights From Stable Carbon Isotope and Water Chemistry |
topic_facet |
DISSOLVED INORGANIC CARBON TIBETAN PLATEAU ORGANIC-CARBON CO2 CONSUMPTION FLUVIAL GEOCHEMISTRY EASTERN SIBERIA CLIMATE-CHANGE GAS-EXCHANGE THAW DEPTH DIOXIDE Environmental Sciences & Ecology Marine & Freshwater Biology Water Resources Environmental Sciences Limnology |
description |
Riverine dissolved inorganic carbon (DIC) exports play a central role in the regional and global carbon cycles. Here, we investigated the spatiotemporal variability and sources of DIC in eight catchments in the Yangtze River source region (YRSR) with variable permafrost coverage and seasonally thawed active layers. The YRSR catchments are DIC-rich (averagely 25 mg C L-1) and export 3.51 g m(-2) yr(-1) of DIC. The seasonal changes of temperature, active layer, flow path, and discharge can alter DIC and stable carbon isotope of DIC (delta C-13-DIC). The most depleted delta C-13-DIC values were found in the thawed period, suggesting the soil-respired CO2 during the active layer thaw period can promote bicarbonate production via H2CO3 weathering. Spatially, delta C-13-DIC values increased downstream, likely due to CO2 outgassing and changed permafrost coverage and runoff. We found that evaporite dissolution and silicate weathering in the seasonally thawed active layer contributed 44.2% and 30.9% of stream HCO3-, respectively, while groundwater and rainwater contributed 16.7% and 7.3% of HCO3-, respectively. Pure carbonate rock weathering played a negligible role in DIC production. These results were compatible with delta C-13-DIC source approximation results. Silicate weathering increased from initial thaw to thawed period, reflecting the active layer thaw and subsequent hydrology change impacts. Silicate weathering consumed 1.25 x 10(10) mol of CO2 annually, while evaporite dissolution may produce CO2 and neutralize this CO2 sink. This study provides new understanding of the riverine DIC export processes of the YRSR. As permafrost degrades, the quantity, sources, and sinks of riverine DIC may also change spatiotemporally. |
format |
Report |
author |
Song, Chunlin Wang, Genxu Mao, Tianxu Huang, Kewei Sun, Xiangyang Hu, Zhaoyong Chang, Ruiying Chen, Xiaopeng Raymond, Peter A. |
author_facet |
Song, Chunlin Wang, Genxu Mao, Tianxu Huang, Kewei Sun, Xiangyang Hu, Zhaoyong Chang, Ruiying Chen, Xiaopeng Raymond, Peter A. |
author_sort |
Song, Chunlin |
title |
Spatiotemporal Variability and Sources of DIC in Permafrost Catchments of the Yangtze River Source Region: Insights From Stable Carbon Isotope and Water Chemistry |
title_short |
Spatiotemporal Variability and Sources of DIC in Permafrost Catchments of the Yangtze River Source Region: Insights From Stable Carbon Isotope and Water Chemistry |
title_full |
Spatiotemporal Variability and Sources of DIC in Permafrost Catchments of the Yangtze River Source Region: Insights From Stable Carbon Isotope and Water Chemistry |
title_fullStr |
Spatiotemporal Variability and Sources of DIC in Permafrost Catchments of the Yangtze River Source Region: Insights From Stable Carbon Isotope and Water Chemistry |
title_full_unstemmed |
Spatiotemporal Variability and Sources of DIC in Permafrost Catchments of the Yangtze River Source Region: Insights From Stable Carbon Isotope and Water Chemistry |
title_sort |
spatiotemporal variability and sources of dic in permafrost catchments of the yangtze river source region: insights from stable carbon isotope and water chemistry |
publisher |
AMER GEOPHYSICAL UNION |
publishDate |
2020 |
url |
http://ir.imde.ac.cn/handle/131551/34167 https://doi.org/10.1029/2019WR025343 |
genre |
permafrost Siberia |
genre_facet |
permafrost Siberia |
op_relation |
WATER RESOURCES RESEARCH http://ir.imde.ac.cn/handle/131551/34167 doi:10.1029/2019WR025343 |
op_doi |
https://doi.org/10.1029/2019WR025343 |
container_title |
Water Resources Research |
container_volume |
56 |
container_issue |
1 |
_version_ |
1766165512317829120 |