In-situ measurement on air-water flux of CH_(4),CO_(2) and their carbon stable isotope in lakes of northeast Tibetan Plateau  

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作  者:Lei WANG Cun-De XIAO Zhi-Heng DU Damien T.MAHER Jing-Feng LIU Zhi-Qiang WEI 

机构地区:[1]State Key Laboratory of Earth Surface Processes and Resource Ecology,Beijing Normal University,Beijing 100875,China [2]State Key Laboratory of Cryospheric Science,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China [3]Southern Cross Geoscience,Southern Cross University,Lismore,NSW 2480,Australia [4]College of Geography and Environmental Science,Northwest Normal University,Lanzhou 730070,China [5]Zhuhai Branch of State Key Laboratory of Earth Surface Process and Resource Ecology,Beijing Normal University,Zhuhai 519087,China

出  处:《Advances in Climate Change Research》2022年第2期279-289,共11页气候变化研究进展(英文版)

基  金:funded by the National Natural Science Foundation of China(41801054);Beijing Normal University Talent Introduction Project(12807-312232101);Youth Innovation Promotion Association,CAS(2020419);Scientific Research Foundation of the Key Laboratory of Cryospheric Sciences(SKLCSZZ-2021).

摘  要:Inland waters are important sources of greenhouse gases(GHGs)to the atmosphere that may partially offset the terrestrial carbon sink.However,GHG emissions from high altitude saline lakes on the Tibetan Plateau are currently poorly constrained.In this study,we measured methane(CH_(4))and carbon dioxide(CO_(2))concentrations and their carbon stable isotope(δ13C),and calculated diffusive water-to-air fluxes from two saline high-altitude lakes,Qinghai Lake and Hala Lake,located in northeast Tibetan Plateau in October 2020.The two lakes were mostly supersaturated in CH_(4)(89.8%-4623.9%sat)and acted as sources of CH_(4) to the atmosphere.Conversely,more than 96%investigated area of Qinghai Lake and all investigated area of Hala Lake was a sink of CO_(2).The average diffusive fluxes of CH_(4) and CO_(2) in the surface waters of Qinghai Lake were 34.51μmol m−2 d−1 and−1.29 mmol m−2 d−1,while diffusive fluxes of CH_(4) and CO_(2) in Hala Lake averaged 5.48μmol m−2 d−1 and−5.24 mmol m−2 d−1,respectively.Salinity(Sal),fluorescent dissolved organic matter(fDOM),temperature(Temp)and dissolved oxygen(DO)are key factors for diffusive CH_(4) and CO_(2) flux in Qinghai Lake and Hala Lake.CH_(4) diffusive fluxes across water-air interface from Qinghai Lake and Hala Lake were found to be significantly lower than other freshwater lakes,likely due to their saline nature.A simple isotope mixing model(Miller-Tans plots)revealed a distinctly different isotopic source values of CO_(2) and CH_(4) in Qinghai Lake and Hala Lake.The CH_(4) production pathway of Qinghai Lake was mainly by the acetate fermentation,while that of Hala Lake was mainly by the CO_(2) reduction.The results show that the continuous measurement can help capture the spatial variability of GHGs fluxes in saline lakes.

关 键 词:Greenhouse gas Air-water flux Carbon stable isotope Tibetan Plateau Saline lakes 

分 类 号:P423[天文地球—大气科学及气象学]

 

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