气候变化领域集成服务门户(CCPortal): Hysteresis Behavior of Surface Water Fluxes in a Hydrologic Transition of an Ephemeral Lake

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DOI	10.1029/2019JD032364
	Hysteresis Behavior of Surface Water Fluxes in a Hydrologic Transition of an Ephemeral Lake
	Cui Y.; Liu Y.; Gan G.; Wang R.
发表日期	2020
ISSN	2169897X
卷号	125 期号:12
英文摘要	Surface heat fluxes are crucial to the energy and water exchanges between surface and the atmosphere. Hysteresis effect poses a challenge in model simulation of evaporation (latent heat flux, LE) at hourly or intradaily scales. The hidden mechanisms behind the hysteresis remain unclear, given the diverse reports in various climates, geographical locations, and underlying surfaces. This study took advantage of eddy covariance flux observation over Poyang Lake of China, an ephemeral lake experiencing seasonal shifts from land to water. It depicted the hysteresis behavior of LE to environmental forces for the period from May to July in 2018, a hydrologic transition period from land to water surface. Our results showed obvious clockwise hysteresis loops between LE and water vapor pressure deficit (VPD), surface temperature (Ts), and air temperature (Ta). Counterclockwise loops exhibited between LE and surface net radiation (Rn), wind speed (WS), and temperature difference (Ts-Ta). Rn, WS, and Ts-Ta dominants control the hysteresis effects and regulate LE variations. The hysteresis loops changed in direction, shape, and area when the surface shifted from land to water. It was primarily related to the lengthened lag time between LE and other variables except for WS, which was attributable to enhanced impacts from WS and VPD, and weakened impacts from Rn and Ts-Ta. The findings should help to improve our understanding of the complicated water-atmosphere interactions at the intradaily scale. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	ephemeral lake; hysteresis effect; lake evaporation; latent heat flux
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/185963
作者单位	Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, China; University of Chinese Academy of Sciences, Beijing, China
推荐引用方式 GB/T 7714	Cui Y.,Liu Y.,Gan G.,et al. Hysteresis Behavior of Surface Water Fluxes in a Hydrologic Transition of an Ephemeral Lake[J],2020,125(12).
APA	Cui Y.,Liu Y.,Gan G.,&Wang R..(2020).Hysteresis Behavior of Surface Water Fluxes in a Hydrologic Transition of an Ephemeral Lake.Journal of Geophysical Research: Atmospheres,125(12).
MLA	Cui Y.,et al."Hysteresis Behavior of Surface Water Fluxes in a Hydrologic Transition of an Ephemeral Lake".Journal of Geophysical Research: Atmospheres 125.12(2020).