CH_(4) and C0_(2) observations from a melting high mountain glacier,Laohugou Glacier No.12  

作　　者：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 

机构地区：[1]State Key Laboratory of Cryospheric Science,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China [2]State Key Laboratory of Earth Surface Processes and Resource Ecology,Beijing Normal University,Beijing 100875,China [3]Zhuhai Branch of State Key Laboratory of Earth Surface Processes and Resource Ecology,Beijing Normal University,Zhuhai 519087,China [4]College of Geography and Environment Science,Northwest Normal University,Lanzhou 730000,China [5]Qilian Shan Station of Glaciology and Ecological Environment,State Key Laboratory of Cry ospheric Science,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China

出　　处：《Advances in Climate Change Research》2022年第1期146-155,共10页气候变化研究进展（英文版）

基　　金：This research has been supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(XAD19070103);the National Key Research and Development Program of China(2020YFA0608501);the State Key Laboratory of Cryospheric Science(SKLCS-ZZ-2021);the Youth Innovation Promotion Association,CAS(2020419);the Second Tibetan Plateau Scientific Expedition and Research Program(2019QZKK0605).

摘　　要：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 CH_(4)and CO_(2)concentrations.Meltwater from the glacier terminus was continually sampled between 3 and 5 August 2020 to measure CH_(4)and CO_(2)concentrations.The results demonstrated that meltwater is a source of CH_(4)because the average saturations are over 100%.It could be con eluded that CH_(4)in the atmosphere can be released by glacial meltwater.However,the CO_(2)saturations are various,and CO_(2)fluxes exhibit positive(released CO_(2))or negative(absorbed CO_(2))values because the water and atmospheric conditions are variable.More importantly,the CH_(4)and CO_(2)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 CH_(4)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 CO_(2)and lead to the release of CH_(4).

关 键 词：CO_(2) CH_(4) Source and sink:Subglacial drainage systems Laohugou glacier No.12 

分 类 号：P343.6[天文地球—水文科学]