CH4 and CO2 observations from a melting high mountain glacier,Laohugou Glacier No.12

• Published in: 气候变化研究进展（英文版） Vol. 13; no. 1; pp. 146 - 155
• Main Authors: Zhi-Heng DU, Lei WANG, Zhi-Qiang WEI, Jing-Feng LIU, Peng-Lin LIN, Jia-Hui LIN, Yan-Zhao LI, Zi-Zhen JIN, Ji-Zu CHEN, Xiao-Xiang WANG, Xiang QIN, Cun-De XIAO
• Format: Journal Article
• Language: English
• Published: State Key Laboratory of Cryospheric Science,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China%State Key Laboratory of Earth Surface Processes and Resource Ecology,Beijing Normal University,Beijing 100875,China%Zhuhai Branch of State Key Laboratory of Earth Surface Processes and Resource Ecology,Beijing Normal University,Zhuhai 519087,China%College of Geography and Environment Science,Northwest Normal University,Lanzhou 730000,China%Qilian Shan Station of Glaciology and Ecological Environment,State Key Laboratory of Cryospheric Science,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China 2022
• Subjects: Source and sink; Laohugou glacier No.12; CO2; Subglacial drainage systems; CH4
• ISSN: 1674-9278; 1674-9278

With global warming,glaciers in the high mountains of China are retreating rapidly.However,few data have been reported on whether greenhouse gases from these glaciers are released into the atmosphere or absorbed by glacial meltwater.In this study,we collected meltwater and ice samples from Laohugou Glacier No.12 in western China and measured CH4 and CO2 concentrations.Meltwater from the glacier terminus was continually sampled between 3 and 5 August 2020 to measure CH4 and CO2 concentrations.The results demonstrated that meltwater is a source of CH4 because the average saturations are over 100％.It could be concluded that CH4 in the atmosphere can be released by glacial meltwater.However,the CO2 saturations are various,and CO2 fluxes exhibit positive (released CO2) or negative (absorbed CO2) values because the water and atmospheric conditions are variable.More importantly,the CH4 and CO2 concentrations were higher in meltwater samples from the glacier terminus than in samples from the surface ice (including an ice core) and a surface stream.Although the meltwater effect from the upper part of the glacier cannot be excluded,we speculated that subglacial drainage systems with an anaerobic environment may represent the CH4 source,but it needs to be further investigated in the future.However,high mountain glaciers are currently ignored in global carbon budgets,and the increased melting of glaciers with global warming may accelerate the absorption of much more CO2 and lead to the release of CH4.