气候变化领域集成服务门户(CCPortal): Non-Closure of Surface Energy Balance Linked to Asymmetric Turbulent Transport of Scalars by Large Eddies

CCPortal

DOI	10.1029/2020JD034474
	Non-Closure of Surface Energy Balance Linked to Asymmetric Turbulent Transport of Scalars by Large Eddies
	Liu H.; Gao Z.; Katul G.G.
发表日期	2021
ISSN	2169897X
卷号	126 期号:7
英文摘要	How large turbulent eddies influence non-closure of the surface energy balance is an active research topic that cannot be uncovered by the mean continuity equation in isolation. It is demonstrated here that asymmetric turbulent flux transport of heat and water vapor by sweeps and ejections of large eddies under unstable atmospheric stability conditions reduce fluxes. Such asymmetry causes positive gradients in the third-order moments in the turbulent flux budget equations, primarily attributed to substantially reduced flux contributions by sweeps and sustained large flux contributions by ejections. Small-scale surface heterogeneity in heating generates ejecting eddies with larger air temperature variance than sweeping eddies, causing asymmetric flux transport in the atmospheric surface layer. Changes in asymmetry with increasing instability are congruent with observed increases in the surface energy balance non-closure. To assess the contributions of asymmetric flux transport by large eddies to the non-closure requires two eddy covariance systems on the tower to measure the gradients of the turbulent heat flux and other third-order moments. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	eddy covariance; latent heat flux; sensible heat flux; surface energy balance; turbulent flux transport
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/185342
作者单位	Department of Civil and Environmental Engineering, Washington State University, Pullman, WA, United States; Nicholas School of the Environment and the Department of Civil and Environmental Engineering, Duke University, Durham, NC, United States
推荐引用方式 GB/T 7714	Liu H.,Gao Z.,Katul G.G.. Non-Closure of Surface Energy Balance Linked to Asymmetric Turbulent Transport of Scalars by Large Eddies[J],2021,126(7).
APA	Liu H.,Gao Z.,&Katul G.G..(2021).Non-Closure of Surface Energy Balance Linked to Asymmetric Turbulent Transport of Scalars by Large Eddies.Journal of Geophysical Research: Atmospheres,126(7).
MLA	Liu H.,et al."Non-Closure of Surface Energy Balance Linked to Asymmetric Turbulent Transport of Scalars by Large Eddies".Journal of Geophysical Research: Atmospheres 126.7(2021).