Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1088/1748-9326/ab83ac |
Warming and monsoonal climate lead to large export of millennial-aged carbon from permafrost catchments of the Qinghai-Tibet Plateau | |
Song, Chunlin1,2; Wang, Genxu2; Haghipour, Negar3,4; Raymond, Peter A.5 | |
2020-07-01 | |
发表期刊 | ENVIRONMENTAL RESEARCH LETTERS
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ISSN | 1748-9326 |
出版年 | 2020 |
卷号 | 15期号:7 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; Switzerland; USA |
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. |
英文关键词 | riverine carbon export radiocarbon stable carbon isotope permafrost Qinghai-Tibet Plateau river climate warming |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000547010600001 |
WOS关键词 | DISSOLVED ORGANIC-CARBON ; NORTHERN-HEMISPHERE ; SOIL CARBON ; RIVERINE EXPORT ; YUKON RIVER ; FLOW PATH ; THAW ; DEGRADATION ; MATTER ; DEPTH |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/289395 |
专题 | 气候变化 |
作者单位 | 1.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu, Sichuan, Peoples R China; 2.Sichuan Univ, State Key Lab Hydraul & Mt River Engn, Coll Water Resource & Hydropower, Chengdu, Sichuan, Peoples R China; 3.Swiss Fed Inst Technol, Inst Geol, Dept Earth Sci, Sonneggstr 5, CH-8092 Zurich, Switzerland; 4.ETHZ, Lab Ion Beam Phys, Otto Stern Weg 5, CH-8093 Zurich, Switzerland; 5.Yale Univ, Sch Forestry & Environm Studies, New Haven, CT 06511 USA |
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). |
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). |
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). |
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