气候变化领域集成服务门户(CCPortal): Coupling of Clouds and Tropospheric Relative Humidity in the Tropical Western Atlantic: Insights From Multisatellite Observations

CCPortal

DOI	10.1029/2020GL087466
	Coupling of Clouds and Tropospheric Relative Humidity in the Tropical Western Atlantic: Insights From Multisatellite Observations
	Brogniez H.; Kirstetter P.-E.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:7
英文摘要	We investigated the interactions between clouds and moisture at the diurnal scale in the Western Atlantic trade winds region. Profiles of tropospheric relative humidity from the SAPHIR/Megha-Tropiques sounder are combined with cloud categories obtained from geostationary satellites. In winter, the midtroposphere undergoes strong daytime drying due to air masses coming from the colder upper troposphere. The moistening near the surface triggered by solar radiation precludes the development of low-level clouds. At night rising moist air in the upper troposphere triggers the formation of high-altitude clouds and favors their presence. In summer, daytime high-altitude clouds shield the solar forcing on the atmosphere and reduce drying from large-scale subsidence. After sunset, the development of upper tropospheric opaque clouds constitutes a local source of moisture. We argue that modulations of the diurnal cycle of clouds and relative humidity by season may be related to diurnal pulses of the Intertropical Convergence Zone. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Geostationary satellites; Moisture; Tropics; Diurnal cycle; Intertropical convergence zone; Low-level clouds; Midtroposphere; Multi-satellite observations; Solar forcing; Upper troposphere; Western Atlantic; Troposphere; geostationary satellite; intertropical convergence zone; observational method; relative humidity; solar radiation; trade wind; troposphere; upper atmosphere; Atlantic Ocean; Atlantic Ocean (West)
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170518
作者单位	LATMOS/IPSL, UVSQ Université Paris-Saclay, Sorbonne Université, CNRS, Guyancourt, France; University of Oklahoma/NOAA National Severe Storm Laboratory, Norman, OK, United States
推荐引用方式 GB/T 7714	Brogniez H.,Kirstetter P.-E.. Coupling of Clouds and Tropospheric Relative Humidity in the Tropical Western Atlantic: Insights From Multisatellite Observations[J],2020,47(7).
APA	Brogniez H.,&Kirstetter P.-E..(2020).Coupling of Clouds and Tropospheric Relative Humidity in the Tropical Western Atlantic: Insights From Multisatellite Observations.Geophysical Research Letters,47(7).
MLA	Brogniez H.,et al."Coupling of Clouds and Tropospheric Relative Humidity in the Tropical Western Atlantic: Insights From Multisatellite Observations".Geophysical Research Letters 47.7(2020).