气候变化领域集成服务门户(CCPortal): Connections Between Daily Surface Temperature Contrast and CO2 Flux Over a Tibetan Lake: A Case Study of Ngoring Lake

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DOI	10.1029/2019JD032277
	Connections Between Daily Surface Temperature Contrast and CO2 Flux Over a Tibetan Lake: A Case Study of Ngoring Lake
	Han B.; Meng X.; Yang Q.; Wu R.; Lv S.; Li Z.; Wang X.; Li Y.; Yu L.
发表日期	2020
ISSN	2169897X
卷号	125 期号:6
英文摘要	To get a deep understand of the carbon cycle of Tibetan lakes, the CO2 flux over Ngoring Lake (NL), a large freshwater lake in the source region of the Yellow River, was monitored from 2011 to 2013 using an eddy covariance system. Based on the monthly mean CO2 flux, NL was a significant sink of atmospheric CO2 in 2012, with the greatest negative (downward) CO2 flux of −0.83 (±0.27) g C m−2 d−1 occurring in October. While in 2011 and 2013, NL was in quasi-equilibrium with atmospheric CO2. The process controlling the daily variation in the CO2 flux was investigated using statistical analysis. The daily mean of the surface wind speed was significantly correlated with the observed daily CO2 flux. Under the assumption that the vertical gradient in the CO2 concentration near the water surface varied slowly, this correlation confirms the rationality of using the surface wind to express the gas transfer velocity. Following this consideration, because the thermal contrast between NL and the surrounding grassland was also significantly correlated with the daily CO2 flux, a new parameterization scheme of k600 is suggested in this study. Potential mechanisms for the coupling process between the surface wind and the thermal contrast of the lake are discussed. Based on the surface energy balance analysis, the heat storage rate of the lake played different roles in the CO2 fluxes during the three years, depending on the CO2 saturation of the lake water. The process controlling the monthly mean CO2 flux was also investigated. ©2020. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186118
作者单位	Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, School of Atmospheric Sciences, Sun Yat-sen University, Guangzhou, China; Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, China; College of Atmospheric Sciences, Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu University of Information Technology, Chengdu, China; Southern Laboratory of Ocean Science and Engineering (Guangdong, Zhuhai), Zhuhai, China; School of Atmospheric Physics, Nanjing University of Information Science and Technology, Nanjing, China; SOA Key Laboratory for Polar Science, Polar Research Institute of China, Shanghai, China
推荐引用方式 GB/T 7714	Han B.,Meng X.,Yang Q.,et al. Connections Between Daily Surface Temperature Contrast and CO2 Flux Over a Tibetan Lake: A Case Study of Ngoring Lake[J],2020,125(6).
APA	Han B..,Meng X..,Yang Q..,Wu R..,Lv S..,...&Yu L..(2020).Connections Between Daily Surface Temperature Contrast and CO2 Flux Over a Tibetan Lake: A Case Study of Ngoring Lake.Journal of Geophysical Research: Atmospheres,125(6).
MLA	Han B.,et al."Connections Between Daily Surface Temperature Contrast and CO2 Flux Over a Tibetan Lake: A Case Study of Ngoring Lake".Journal of Geophysical Research: Atmospheres 125.6(2020).