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Observation of CO2 degassing in Tianshuihai Lake Basin of the Qinghai-Tibetan Plateau |
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| Authors: | Xiaodong Wu Lin Zhao Tonghua Wu Ji Chen Qiangqiang Pang Erji Du Hongbing Fang Zhiwei Wang Yonghua Zhao Yongjian Ding |
| Institution: | 1. Cryosphere Research Station on the Qinghai-Tibetan Plateau, Chinese Academy of Sciences, Lanzhou, China 2. State Key Laboratory of Cryospheric Sciences, Lanzhou, China 3. Cold and Arid Regions Environmental and Engineering Research Institute, Lanzhou, China 4. State Key Laboratory of Frozen Soil Engineering, Lanzhou, China 5. School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou, China |
| Abstract: | A large volume of underground gas in the permafrost region of the Qinghai-Tibetan Plateau has been identified. Although many studies were performed to investigate the soil organic carbon dynamics and Earth degassing in volcanic areas, this is the first report of a large amount of non-volcanic CO2 contained in permafrost. The gas was mostly CO2 (81.76 vol. %) and nitrogen (14.59 vol. %). The gas composition and the evidence from carbon stable isotope values (?23.9 ‰, PDB) suggested that the gases possibly had a deep origin. The gas emissions may be triggered by permafrost degradation, which means mitigation of the barrier effect of permafrost for the gas. In addition, plate tectonic processes may also lead to gas emissions, as the tectonic activity is strong in the area. Therefore, particular attention should be paid to the underground gases in the study of global change and permafrost degradation. |
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