Isotopic composition and emission characteristics of CO 2 and CH 4 in glacial lakes of the Tibetan Plateau
Bibliographic Data
| ID | 15545596 |
|---|---|
| Authors | Fangping Yan (0000-0002-5611-0239, Chinese Academy of Sciences), Zhiheng Du (0009-0002-9350-7574, Chinese Academy of Sciences, corresponding author), Tao Pu (0000-0002-1876-1487, Chinese Academy of Sciences), Qian Xu (0000-0001-8130-0846, Chinese Academy of Sciences), Lei Wang (0000-0001-5326-565X, Beijing Normal University), Ruifang Ma (0000-0002-3663-2240, Chinese Academy of Sciences), Chao Zhang (0000-0003-3686-4743, Chinese Academy of Sciences), Zhengliang Yu (0000-0002-6336-3509, Chinese Academy of Sciences), Chaoliu Li (0000-0003-2092-2435, Chinese Academy of Sciences), Shichang Kang (0000-0003-2115-9005, Chinese Academy of Sciences), Lekhendra Tripathee (0000-0001-6210-5105) |
| Year | 2023 |
| Volume | 18 |
| Issue | 9 |
| Pages | 094025-094025 |
| Publication date | 2023-07-28 |
| Peer Reviewed | Yes |
| Open Access | Yes |
| Type | ARTICLE |
| Venue | Environmental Research Letters (JOURNAL) |
| Journal identifiers | ISSN: 1748-9326 • E-ISSN: 1748-9326 |
| Publisher | IOP Publishing (PUBLISHER • GB) |
| DOI | 10.1088/1748-9326/aceb7b |
| OpenAlex | W4385332715 |
| Language | EN |
| References cited | 66 |
Carbon dioxide (CO 2 ) and methane (CH 4 ) emissions from freshwater ecosystems are predicted to increase under climate warming. However, freshwater ecosystems in glacierized regions differ critically from those in non-glacierized regions. The potential emissions of CO 2 and CH 4 from glacierized environments in the Tibetan Plateau (TP) were only recently recognized. Here, the first direct measurement of CO 2 and CH 4 emission fluxes and isotopic composition during the spring of 2022 in 13 glacial lakes of the TP revealed that glacial lakes were the previously overlooked CO 2 sinks due to chemical weathering in glacierized regions. The daily average CO 2 flux was −5.1 ± 4.4 mmol m −2 d −1 , and the CO 2 consumption could reach 38.9 Gg C-CO 2 yr −1 by all glacial lakes in the TP. This consumption might be larger during summer when glaciers experience intensive melting, highlighting the importance of CO 2 uptake by glacial lakes on the global carbon cycle. However, the studied glacial lakes were CH 4 sources with total emission flux ranging from 4.4 ± 3.3 to 4082.5 ± 795.6 μ mol m −2 d −1 . The large CH 4 range was attributed to ebullition found in three of the glacial lakes. Low dissolved organic carbon concentrations and CH 4 oxidation might be responsible for the low CH 4 diffusive fluxes of glacial lakes without ebullition. In addition, groundwater input could alter CO 2 and CH 4 emissions from glacial lakes. CH 4 in glacial lakes probably had a thermogenic source; whereas CO 2 was influenced mainly by atmospheric input, as well as organic matter remineralization and CH 4 oxidation. Overall, glacial lakes in the TP play an important role in the global carbon cycle and budget, and more detailed isotopic and microbial studies are needed to constrain the contributions of different pathways to CO 2 and CH 4 production, consumption and emissions
Atmospheric sciences · Carbon cycle · Carbon dioxide · Ecosystem · Geography · Geomorphology · Glacial period · Glacier · Last Glacial Maximum · Physical geography · Plateau (mathematics · Weathering · Arctic and Antarctic ice dynamics · Atmospheric and Environmental Gas Dynamics · Chemistry · Cryospheric studies and observations · Environmental Science · Ecology · Environmental Chemistry · Geology
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| Citation velocity | historical |
|---|---|
| Highly cited | No |