气候变化领域集成服务门户(CCPortal): Cloud phase characteristics over Southeast Asia from A-Train satellite observations

CCPortal

DOI	10.5194/acp-20-8267-2020
	Cloud phase characteristics over Southeast Asia from A-Train satellite observations
	Hong Y.; Di Girolamo L.
发表日期	2020
ISSN	1680-7316
起始页码	8267
结束页码	8291
卷号	20 期号:13
英文摘要	This study examines the climatology of cloud phase over Southeast Asia (SEA) based on A-Train satellite observations. Using the combined CloudSat.CALIPSO (CC) data, five main cloud groups are investigated: Ice-only, ice-above-liquid, liquid-only, ice-above-mixed, and mixedonly clouds that have annual mean frequencies of 28.6 %, 20.1 %, 16.0 %, 9.3 %, and 6.7 %, respectively. Liquid-only clouds tend to occur in relatively cold, dry, and stable lower troposphere. The other four cloud groups appear more frequently in relatively warm, humid, and unstable conditions, and their seasonal distributions move with the Asian monsoon and the Intertropical Convergence Zone (ITCZ). Liquid clouds are found to be highly inhomogeneous based on the heterogeneity index (Hσ ) from Aqua Moderate Resolution Imaging Spectroradiometer (MODIS), while iceonly and mixed-only clouds are often very smooth. Iceabove-liquid clouds are more heterogeneous than ice-only clouds owing to ice clouds being optically thin. We demonstrate that the distribution of clear-sky Hσ has a long tail towards heterogeneous values that are caused by undetected subpixel cloud within both CC and MODIS datasets. The reflectance at 0.645 μm (R0:645) and brightness temperature at 11 μm (BT11) of CC ice-only, liquid-only, and iceabove-liquid clouds show peak frequencies near that of clear sky (R0.645 ∼ 0.02; BT11 ∼ 294 K), which explains why up to 30% of these CC cloud groups are classified as clear by MODIS. In contrast, mixed-only clouds are thick (average top ∼ 13 km), bright (average R0:645 ∼ 0.6), and cold (average BT11 ∼ 234 K). Cloud phase comparison between CC and MODIS reveals only modest agreement, with the best agreement (73 %) occurring between CC ice-above-mixed and MODIS ice clouds. The intraseasonal and interannual behaviors of the all-sky Hσ and spectral signatures follow that of cloud phase and vary with the Madden.Julian oscillation (MJO) and the El Nino.Southern Oscillation (ENSO) phases. © 2020 Author(s).
语种	英语
scopus关键词	CALIPSO; cloud; CloudSat; intertropical convergence zone; MODIS; monsoon; satellite data; Southeast Asia
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/141218
作者单位	Department of Atmospheric Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, United States
推荐引用方式 GB/T 7714	Hong Y.,Di Girolamo L.. Cloud phase characteristics over Southeast Asia from A-Train satellite observations[J],2020,20(13).
APA	Hong Y.,&Di Girolamo L..(2020).Cloud phase characteristics over Southeast Asia from A-Train satellite observations.Atmospheric Chemistry and Physics,20(13).
MLA	Hong Y.,et al."Cloud phase characteristics over Southeast Asia from A-Train satellite observations".Atmospheric Chemistry and Physics 20.13(2020).