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Seasonal and diel variability of CO2 emissions from a semiarid hard-water reservoir

文献类型：期刊论文

作者Ran, Lishan2; Yue, Rong3; Shi, Hongyan4; Meng, Xiangdong3; Fang, Nufang3,5; Shi, Zhihua1,6; Chan, Chun Ngai
刊名JOURNAL OF HYDROLOGY
出版日期2022-05-01
卷号608页码:11
关键词CO2 emissions CO2 partial pressure(pCO(2)) Seasonal and diel variability Hard-water reservoir Chinese Loess Plateau
ISSN号0022-1694
DOI10.1016/j.jhydrol.2022.127652
通讯作者Fang, Nufang(fnf@ms.iswc.ac.cn)
英文摘要Reservoirs represent a key component of the global carbon cycle. However, estimates of carbon dioxide (CO2) emissions from reservoirs remain poorly constrained due to the absence of spatially and temporally resolved measurements. We performed high-resolution monitoring of CO2 emissions (F-CO2) in a semiarid hard-water reservoir to examine its seasonal and diel variability. Our results suggest that dissolved inorganic carbon input plays a central role in sustaining the surface water CO2 partial pressure (pCO(2)), which varies from 1076 to 4587 mu atm. Although the reservoir is moderately to highly productive throughout the year, it is a net CO(2 )source with F-CO2 values in the range of 308-1753 mg C m(-2) d(-1). This high CO(2 )efflux indicates that productive waters are not necessarily CO2 sinks. Both pCO(2) and F-CO2 exhibit clear seasonal and diel patterns. Surface water pCO(2) is highest in March and presents a consistent diurnal/nocturnal pattern with the daytime pCO(2) 6-13% lower than the nighttime pCO(2). High CO2 efflux is observed during the ice-thaw period, indicating the release of CO2 that was accumulated during the winter. CO2 effluxes are typically higher during the nighttime driven by aquatic metabolism, but episodic weather events (e.g., rainfall and strong winds) can significantly enhance CO2 emissions and even reverse the diel pattern. Our study also shows that using only daytime measurements to estimate daily CO(2 )emissions would underestimate it by 9-25%. Hence, future global assessments should incorporate CO2 emissions from hard-water reservoirs and account for their seasonal and diel variability.
WOS关键词GREENHOUSE-GAS EMISSIONS ; CARBON-DIOXIDE ; TROPICAL RESERVOIR ; SURFACE-WATER ; LAKE ; RIVER ; PCO(2) ; DYNAMICS ; SHALLOW ; METHANE
资助项目Research Grants Council of Hong Kong[17300621] ; National Natural Science Foundation of China[41930755] ; National Natural Science Foundation of China[41807318] ; CAS Youth Scholar of West China Program[XAB2018A03]
WOS研究方向Engineering ; Geology ; Water Resources
语种英语
WOS记录号WOS:000790508500001
出版者ELSEVIER
资助机构Research Grants Council of Hong Kong ; National Natural Science Foundation of China ; CAS Youth Scholar of West China Program
源URL[http://ir.igsnrr.ac.cn/handle/311030/176100]  
专题中国科学院地理科学与资源研究所
通讯作者Fang, Nufang
作者单位1.Huazhong Agr Univ, Coll Resources & Environm, Wuhan 430070, Peoples R China
2.Univ Hong Kong, Dept Geog, Hong Kong, Peoples R China
3.Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess Pl, Yangling 712100, Peoples R China
4.Inner Mongolia Univ, Coll Environm & Resources, Hohhot 010020, Peoples R China
5.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, Yangling 712100, Peoples R China
6.CAS Ctr Excellence Quaternary Sci & Global Change, Xi'an 710061, Peoples R China
推荐引用方式
GB/T 7714		 Ran, Lishan,Yue, Rong,Shi, Hongyan,et al. Seasonal and diel variability of CO2 emissions from a semiarid hard-water reservoir[J]. JOURNAL OF HYDROLOGY,2022,608:11.
APA Ran, Lishan.,Yue, Rong.,Shi, Hongyan.,Meng, Xiangdong.,Fang, Nufang.,...&Chan, Chun Ngai.(2022).Seasonal and diel variability of CO2 emissions from a semiarid hard-water reservoir.JOURNAL OF HYDROLOGY,608,11.
MLA Ran, Lishan,et al."Seasonal and diel variability of CO2 emissions from a semiarid hard-water reservoir".JOURNAL OF HYDROLOGY 608(2022):11.

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来源：地理科学与资源研究所

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