气候变化领域集成服务门户(CCPortal): In-situ measurement on air-water flux of CH4, CO2 and their carbon stable isotope in lakes of northeast Tibetan Plateau

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DOI	10.1016/j.accre.2022.02.001
	In-situ measurement on air-water flux of CH4, CO2 and their carbon stable isotope in lakes of northeast Tibetan Plateau
	Wang, Lei; Xiao, Cun-De; Du, Zhi-Heng; Maher, Damien T.; Liu, Jing-Feng; Wei, Zhi-Qiang
通讯作者	Du, ZH (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, Lanzhou 730000, Peoples R China.
发表日期	2022
ISSN	1674-9278
起始页码	279
结束页码	289
卷号	13 期号:2
英文摘要	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 (CH4) and carbon dioxide (CO2) concentrations and their carbon stable isotope (delta C-13), 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 CH4 (89.8%-4623.9% sat) and acted as sources of CH4 to the atmosphere. Conversely, more than 96% investigated area of Qinghai Lake and all investigated area of Hala Lake was a sink of CO2. The average diffusive fluxes of CH4 and CO2 in the surface waters of Qinghai Lake were 34.51 mu mol m(-2) d(-1) and -1.29 mmol m(-2) d(-)(1), while diffusive fluxes of CH4 and CO2 in Hala Lake averaged 5.48 mu mol 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 CH4 and CO2 flux in Qinghai Lake and Hala Lake. CH4 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 CO2 and CH4 in Qinghai Lake and Hala Lake. The CH4 production pathway of Qinghai Lake was mainly by the acetate fermentation, while that of Hala Lake was mainly by the CO2 reduction. The results show that the continuous measurement can help capture the spatial variability of GHGs fluxes in saline lakes.
关键词	METHANE EMISSIONS GREENHOUSE GASES METHANOGENIC PATHWAYS LITTORAL-ZONE DIOXIDE SHALLOW CHINA SEA FRACTIONATION EBULLITION
英文关键词	Greenhouse gas; Air-water flux; Carbon stable isotope; Tibetan Plateau; Saline lakes
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000777105900014
来源期刊	ADVANCES IN CLIMATE CHANGE RESEARCH
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254271
作者单位	[Wang, Lei; Xiao, Cun-De] Beijing Normal Univ, State Key Lab Earth Surface Proc & Resource, Beijing 100875, Peoples R China; [Du, Zhi-Heng] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, Lanzhou 730000, Peoples R China; [Maher, Damien T.] Southern Cross Univ, Southern Cross Geosci, Lismore, NSW 2480, Australia; [Liu, Jing-Feng] Northwest Normal Univ, Coll Geog & Environm Sci, Lanzhou 730070, Peoples R China; [Wei, Zhi-Qiang] Beijing Normal Univ, Zhuhai Branch State Key Lab Earth Surface Proc &, Zhuhai 519087, Peoples R China
推荐引用方式 GB/T 7714	Wang, Lei,Xiao, Cun-De,Du, Zhi-Heng,et al. In-situ measurement on air-water flux of CH4, CO2 and their carbon stable isotope in lakes of northeast Tibetan Plateau[J]. 中国科学院西北生态环境资源研究院,2022,13(2).
APA	Wang, Lei,Xiao, Cun-De,Du, Zhi-Heng,Maher, Damien T.,Liu, Jing-Feng,&Wei, Zhi-Qiang.(2022).In-situ measurement on air-water flux of CH4, CO2 and their carbon stable isotope in lakes of northeast Tibetan Plateau.ADVANCES IN CLIMATE CHANGE RESEARCH,13(2).
MLA	Wang, Lei,et al."In-situ measurement on air-water flux of CH4, CO2 and their carbon stable isotope in lakes of northeast Tibetan Plateau".ADVANCES IN CLIMATE CHANGE RESEARCH 13.2(2022).