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Warming and monsoonal climate lead to large export of millennial-aged carbon from permafrost catchments of the Qinghai-Tibet Plateau

文献类型：期刊论文

作者Song,Chunlin1,5; Wang,Genxu5; Haghipour,Negar3,4; Raymond,Peter A2; Song Chunlin
刊名Environmental Research Letters
出版日期2020-06-22
卷号15期号:7页码:13
关键词riverine carbon export radiocarbon stable carbon isotope permafrost Qinghai-Tibet Plateau river climate warming
ISSN号1748-9326
DOI10.1088/1748-9326/ab83ac
通讯作者Wang,Genxu()
英文摘要AbstractPermafrost carbon pool destabilization causes substantial fluvial export of soil carbon, yet the export patterns and magnitudes are not well understood. Here we investigated the radiocarbon (14C) in dissolved organic and inorganic carbon (DOC and DIC, respectively) exported from a mid-sized river in the central Qinghai-Tibet Plateau (QTP) permafrost region. We utilized the radiocarbon dating technique to reveal the ages of riverine dissolved carbon and a statistical model to partition the riverine carbon from different age categories. DOC and DIC showed bomb-depleted 14C signatures corresponding to millennial ages. Seasonally, 14C-depleted DOC and DIC ages were associated with active layer thaw and flow path deepening. Spatially, older DOC and DIC were found in the valley sites correlated with warmer permafrost and higher groundwater flow. Further, isotopic mixing models suggested that 83 ± 27% of riverine DOC was derived from active layer and permafrost layer aged carbon. DIC export was comprised of a smaller portion of aged carbon (47.3 ± 2.6%) but a much larger flux of aged carbon due to higher annual DIC export. Interestingly, approximately 56% of annual aged DOC and DIC were exported in the short summer season (July to September). The monsoon climate-induced overlap of high discharge and maximum active layer thaw depth in summer enhanced the remarkably rapid fluvial export of millennial-aged carbon. Annual aged carbon yields in YRSR (275 ± 90 and 1661 ± 91 kg km?2 yr?1 for DOC and DIC, respectively) are much larger than those of Kolyma River (160 ± 89 and 234 ± 105 kg km?2 yr?1 for DOC and DIC, respectively). These results suggest a unique old carbon loss pattern in the QTP permafrost region compared to higher latitude permafrost regions with a non-monsoonal climate. As climate warms, more old carbon export is expected, which may affect the permafrost carbon pool and the river biogeochemical processes.
WOS关键词DISSOLVED ORGANIC-CARBON ; NORTHERN-HEMISPHERE ; SOIL CARBON ; RIVERINE EXPORT ; YUKON RIVER ; FLOW PATH ; THAW ; DEGRADATION ; MATTER ; DEPTH
资助项目Second Tibetan Plateau Scientific Expedition and Research Program (STEP)[2019QZKK0304] ; National Natural Science Foundation of China[41890821] ; China Postdoctoral Science Foundation[2019M663566] ; China Scholarship Council
WOS研究方向Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
语种英语
WOS记录号IOP:1748-9326-15-7-AB83AC
出版者IOP Publishing
资助机构Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Scholarship Council
源URL[http://ir.imde.ac.cn/handle/131551/35040]  
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.Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, Sichuan, People’s Republic of China
2.School of Forestry and Environmental Studies, Yale University, New Haven, Connecticut, United States of America
3.Laboratory of Ion Beam Physics, ETHZ, Otto-Stern-Weg 5, Zurich 8093, Switzerland
4.Geological Institute, Department of Earth Sciences, ETH Zürich, Sonneggstrasse 5, Zürich 8092, Switzerland
5.State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, Sichuan, People’s Republic of China
推荐引用方式
GB/T 7714		 Song,Chunlin,Wang,Genxu,Haghipour,Negar,et al. Warming and monsoonal climate lead to large export of millennial-aged carbon from permafrost catchments of the Qinghai-Tibet Plateau[J]. Environmental Research Letters,2020,15(7):13.
APA Song,Chunlin,Wang,Genxu,Haghipour,Negar,Raymond,Peter A,&Song Chunlin.(2020).Warming and monsoonal climate lead to large export of millennial-aged carbon from permafrost catchments of the Qinghai-Tibet Plateau.Environmental Research Letters,15(7),13.
MLA Song,Chunlin,et al."Warming and monsoonal climate lead to large export of millennial-aged carbon from permafrost catchments of the Qinghai-Tibet Plateau".Environmental Research Letters 15.7(2020):13.

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来源：成都山地灾害与环境研究所

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