Spatiotemporal Variability and Sources of DIC in Permafrost Catchments of the Yangtze River Source Region: Insights From Stable Carbon Isotope and Water Chemistry
文献类型：期刊论文
| 作者 | Song Chunlin1,4 ; Wang Genxu4; Mao Tianxu5; Huang Kewei1,4; Sun Xiangyang4; Hu Zhaoyong4; Chang Ruiying4; Chen Xiaopeng2; Raymond Peter A.3
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| 刊名 | WATER RESOURCES RESEARCH
 |
| 出版日期 | 2020 |
| 卷号 | 56期号:1页码:e2019WR025343 |
| ISSN号 | 0043-1397 |
| DOI | 10.1029/2019WR025343 |
| 产权排序 | 1 |
| 通讯作者 | Wang, Genxu(wanggx@imde.ac.cn) |
| 文献子类 | Article |
| 英文摘要 | 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. |
| 电子版国际标准刊号 | 1944-7973 |
| WOS关键词 | DISSOLVED INORGANIC CARBON ; TIBETAN PLATEAU ; ORGANIC-CARBON ; CO2 CONSUMPTION ; FLUVIAL GEOCHEMISTRY ; EASTERN SIBERIA ; CLIMATE-CHANGE ; GAS-EXCHANGE ; THAW DEPTH ; DIOXIDE |
| 资助项目 | Key Program of the National Natural Science Foundation of China[91547203] ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP)[2019QZKK0304] ; National Natural Science Foundation of China[41701037] ; China Scholarship Council |
| WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:000520132500005 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 资助机构 | Key Program of the National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Natural Science Foundation of China ; China Scholarship Council |
| 源URL | [http://ir.imde.ac.cn/handle/131551/34143]  |
| 专题 | 成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室 |
| 通讯作者 | Wang Genxu |
| 作者单位 | 1.University of Chinese Academy of Sciences, Beijing, China; 2.College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Jinzhong, China; 3.Yale School of Forestry and Environmental Studies, Yale University, New Haven, CT, USA 4.Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, China; 5.College of Forestry, Guizhou University, Guiyang, China; |
| 推荐引用方式 GB/T 7714 | Song Chunlin,Wang Genxu,Mao Tianxu,et al. Spatiotemporal Variability and Sources of DIC in Permafrost Catchments of the Yangtze River Source Region: Insights From Stable Carbon Isotope and Water Chemistry[J]. WATER RESOURCES RESEARCH,2020,56(1):e2019WR025343. |
| APA | Song Chunlin.,Wang Genxu.,Mao Tianxu.,Huang Kewei.,Sun Xiangyang.,...&Raymond Peter A..(2020).Spatiotemporal Variability and Sources of DIC in Permafrost Catchments of the Yangtze River Source Region: Insights From Stable Carbon Isotope and Water Chemistry.WATER RESOURCES RESEARCH,56(1),e2019WR025343. |
| MLA | Song Chunlin,et al."Spatiotemporal Variability and Sources of DIC in Permafrost Catchments of the Yangtze River Source Region: Insights From Stable Carbon Isotope and Water Chemistry".WATER RESOURCES RESEARCH 56.1(2020):e2019WR025343. |
入库方式： OAI收割
来源：成都山地灾害与环境研究所
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