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

doi:10.1088/1748-9326/ab83ac

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部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

	Warming and monsoonal climate lead to large export of millennial-aged carbon from permafrost catchments of the Qinghai-Tibet Plateau
	Song Chunlin 2,3; Wang Genxu 3; Haghipour Negar 1,4; Raymond Peter A.5
刊名	ENVIRONMENTAL RESEARCH LETTERS
	2020
卷号	15 期号:7 页码:74012
关键词	riverine carbon export radiocarbon stable carbon isotope permafrost Qinghai-Tibet Plateau river climate warming
ISSN号	1748-9326
DOI	10.1088/1748-9326/ab83ac
产权排序	1
文献子类	Article
英文摘要	Permafrost 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 (C-14) 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(14)C signatures corresponding to millennial ages. Seasonally,C-14-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.
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关键词	DISSOLVED ORGANIC-CARBON ; NORTHERN-HEMISPHERE ; SOIL CARBON ; RIVERINE EXPORT ; YUKON RIVER ; FLOW PATH ; THAW ; DEGRADATION ; MATTER ; DEPTH
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
语种	英语
出版者	IOP Publishing
WOS记录号	WOS:000547010600001
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
内容类型	期刊论文
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.Laboratory of Ion Beam Physics, ETHZ, Otto-Stern-Weg 5, Zurich 8093, Switzerland; 2.Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, Sichuan, People’s Republic of China; 3.State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, Sichuan, People’s Republic of China; 4.Geological Institute, Department of Earth Sciences, ETH Zürich, Sonneggstrasse 5, Zürich 8092, Switzerland; 5.School of Forestry and Environmental Studies, Yale University, New Haven, Connecticut, United States of America
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):74012.
APA	Song Chunlin,Wang Genxu,Haghipour Negar,&Raymond Peter A..(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),74012.
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):74012.