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DOI	10.5194/acp-20-3921-2020
	The diurnal cycle of the clouds extending above the tropical tropopause observed by spaceborne lidar
	Dauhut T.; Noel V.; Dion I.-A.
发表日期	2020
ISSN	16807316
起始页码	3921
结束页码	3929
卷号	20 期号:6
英文摘要	The presence of clouds above the tropopause over tropical convection centers has so far been documented by spaceborne instruments that are either sun-synchronous or insensitive to thin cloud layers. Here we document, for the first time through direct observation by spaceborne lidar, how the tropical cloud fraction evolves above the tropopause throughout the day. After confirming previous studies that found such clouds most frequently above convection centers, we show that stratospheric clouds and their vertical extent above the tropopause follow a diurnal rhythm linked to convective activity. The diurnal cycle of the stratospheric clouds displays two maxima: one in the early night (19:00-20:00 LT) and a later one (00:00-01:00 LT). Stratospheric clouds extend up to 0.5-1 km above the tropopause during nighttime, when they are the most frequent. The frequency and the vertical extent of stratospheric clouds is very limited during daytime, and when present they are found very close to the tropopause. Results are similar over the major convection centers (Africa, South America and the Warm Pool), with more clouds above land in DJF (December-January-February) and less above the ocean and in JJA (June-July-August). © 2020 Author(s).
关键词	atmospheric convection cloud diurnal variation lidar tropical environment tropopause warm pool Africa South America
语种	英语
来源机构	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132126
推荐引用方式 GB/T 7714	Dauhut T.,Noel V.,Dion I.-A.. The diurnal cycle of the clouds extending above the tropical tropopause observed by spaceborne lidar[J]. Atmospheric Chemistry and Physics,2020,20(6).
APA	Dauhut T.,Noel V.,&Dion I.-A..(2020).The diurnal cycle of the clouds extending above the tropical tropopause observed by spaceborne lidar.,20(6).
MLA	Dauhut T.,et al."The diurnal cycle of the clouds extending above the tropical tropopause observed by spaceborne lidar".20.6(2020).