Seasonal and spatial variations in riverine DOC exports in permafrost-dominated Arctic river basins
文献类型：期刊论文
| 作者 | Liu, Shiqi3; Wang, Ping1,3; Huang, Qiwei1,3; Yu, Jingjie1,3; Pozdniakov, Sergey P.2; Kazak, Ekaterina S.2 |
| 刊名 | JOURNAL OF HYDROLOGY
 |
| 出版日期 | 2022-09-01 |
| 卷号 | 612页码:13 |
| ISSN号 | 0022-1694 |
| 关键词 | Riverine dissolved organic carbon Permafrost Climate warming Arctic rivers |
| DOI | 10.1016/j.jhydrol.2022.128060 |
| 通讯作者 | Wang, Ping(wangping@igsnrr.ac.cn) |
| 英文摘要 | Climate warming is accelerating the release of voluminous organic carbon from thawing permafrost into the Arctic Ocean via riverine transport. However, the seasonal variations in riverine dissolved organic carbon (DOC) exports in Arctic river basins with different areal extents of permafrost and how changes in water temperature (T-w) impact seasonal DOC exports are not fully understood. In this study, the concentrations, ages and seasonality of riverine DOC in the estuaries of six major Arctic rivers (Ob, Yenisei, Lena, Kolyma, Yukon and Mackenzie) were analysed using Arctic Great Rivers Observatory (ArcticGRO) datasets from 2003 to 2019. The results showed that DOC concentrations generally increased with the increases in the streamflow, but always dropped to the minimum with the oldest Delta C-14-DOC ages (as old as 1650 years BP) in the freezing period (November-April), when the streamflow originates predominantly from groundwater. During the flood pulse period (May or June), a rapid increase in riverine DOC concentration with younger organic carbon (Delta C-14 values from -61 to 152 parts per thousand) was observed, likely associated with snowmelt-dominated runoff regimes (lower delta O-18-H2O of approximately -20.4 +/- 1.6 parts per thousand). During the ice-free period (June-September), DOC concentrations decreased due to the enhanced dilution of streamflow from precipitation. In the Lena and Kolyma River basins with large areal extents of continuous permafrost, over 70% of DOC flux exported during the ice-free period originated from DOC sources from similar to 410 years and similar to 230 years BP to the present, respectively; this suggests that greater permafrost extents restrict the release of older DOC into rivers. However, riverine DOC exports likely respond positively to changes in T-w during the ice-free period. In addition, such a positive response is likely to be enhanced in basins with larger percentages of sporadic permafrost, thicker active layers, more precipitation and less soil organic carbon. Ultimately, under a warming climate, riverine DOC exports are expected to rise with increasing river water temperatures. |
| WOS关键词 | DISSOLVED ORGANIC-CARBON ; ICE BREAKUP ; OB RIVER ; WATER ; DYNAMICS ; STREAM ; THAW ; SNOWMELT ; NUTRIENT ; HYDROGEOCHEMISTRY |
| 资助项目 | National Natural Science Foundation of China[E1C10060AE] ; NSFC-RSF[42061134017] ; NSFC-RSF[21-47-00008] ; China Postdoctoral Science Foundation[O7Z76095Z1] ; Science and Technology Basic Resources Investigation Program of China[2017FY101302] |
| WOS研究方向 | Engineering ; Geology ; Water Resources |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:000833520700004 |
| 资助机构 | National Natural Science Foundation of China ; NSFC-RSF ; China Postdoctoral Science Foundation ; Science and Technology Basic Resources Investigation Program of China |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/181627]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Wang, Ping |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Lomonosov Moscow State Univ, Dept Hydrogeol, GSP-1 Leninskie Gory, Moscow 119899, Russia 3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, 11A,Datun Rd, Beijing 100101, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Shiqi,Wang, Ping,Huang, Qiwei,et al. Seasonal and spatial variations in riverine DOC exports in permafrost-dominated Arctic river basins[J]. JOURNAL OF HYDROLOGY,2022,612:13. |
| APA | Liu, Shiqi,Wang, Ping,Huang, Qiwei,Yu, Jingjie,Pozdniakov, Sergey P.,&Kazak, Ekaterina S..(2022).Seasonal and spatial variations in riverine DOC exports in permafrost-dominated Arctic river basins.JOURNAL OF HYDROLOGY,612,13. |
| MLA | Liu, Shiqi,et al."Seasonal and spatial variations in riverine DOC exports in permafrost-dominated Arctic river basins".JOURNAL OF HYDROLOGY 612(2022):13. |
入库方式： OAI收割
来源：地理科学与资源研究所
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