干旱区生态环境知识资源中心(Arid): Radiative controls by clouds and thermodynamics shape surface temperatures and turbulent fluxes over land

Arid

DOI	10.1073/pnas.2220400120
	Radiative controls by clouds and thermodynamics shape surface temperatures and turbulent fluxes over land
	Ghausi, Sarosh Alam; Tian, Yinglin; Zehe, Erwin; Kleidon, Axel
通讯作者	Ghausi, SA
来源期刊	PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
ISSN	0027-8424
EISSN	1091-6490
出版年	2023
卷号	120 期号:29
英文摘要	Land surface temperatures (LSTs) are strongly shaped by radiation but are modulated by turbulent fluxes and hydrologic cycling as the presence of water vapor in the atmosphere (clouds) and at the surface (evaporation) affects temperatures across regions. Here, we used a thermodynamic systems framework forced with independent observations to show that the climatological variations in LSTs across dry and humid regions are mainly mediated through radiative effects. We first show that the turbulent fluxes of sensible and latent heat are constrained by thermodynamics and the local radiative conditions. This constraint arises from the ability of radiative heating at the surface to perform work to maintain turbulent fluxes and sustain vertical mixing within the convective boundary layer. This implies that reduced evaporative cooling in dry regions is then compensated for by an increased sensible heat flux and buoyancy, which is consistent with observations. We show that the mean temperature variation across dry and humid regions is mainly controlled by clouds that reduce surface heating by solar radiation. Using satellite observations for cloudy and clear-sky conditions, we show that clouds cool the land surface over humid regions by up to 7 K, while in arid regions, this effect is absent due to the lack of clouds. We conclude that radiation and thermodynamic limits are the primary controls on LSTs and turbulent flux exchange which leads to an emergent simplicity in the observed climatological patterns within the complex climate system.
英文关键词	land-atmosphere interactions radiation thermodynamics clouds
类型	Article
语种	英语
开放获取类型	hybrid, Green Published
收录类别	SCI-E
WOS记录号	WOS:001070984300001
WOS关键词	CONVECTIVE EQUILIBRIUM ; ENTROPY BUDGET ; SOIL-MOISTURE ; ATMOSPHERE ; CLIMATE ; BALANCE ; PRECIPITATION ; DEFORESTATION ; EVAPORATION ; EARTH
WOS类目	Multidisciplinary Sciences
WOS研究方向	Science & Technology - Other Topics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/398165
推荐引用方式 GB/T 7714	Ghausi, Sarosh Alam,Tian, Yinglin,Zehe, Erwin,et al. Radiative controls by clouds and thermodynamics shape surface temperatures and turbulent fluxes over land[J],2023,120(29).
APA	Ghausi, Sarosh Alam,Tian, Yinglin,Zehe, Erwin,&Kleidon, Axel.(2023).Radiative controls by clouds and thermodynamics shape surface temperatures and turbulent fluxes over land.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,120(29).
MLA	Ghausi, Sarosh Alam,et al."Radiative controls by clouds and thermodynamics shape surface temperatures and turbulent fluxes over land".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 120.29(2023).