气候变化领域集成服务门户(CCPortal): Transient aggregation of convection: Observed behavior and underlying processes

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DOI	10.1175/JCLI-D-19-0933.1
	Transient aggregation of convection: Observed behavior and underlying processes
	Masunaga H.; Holloway C.E.; Kanamori H.; Bony S.; Stein T.H.M.
发表日期	2021
ISSN	08948755
起始页码	1685
结束页码	1700
卷号	34 期号:5
英文摘要	Convective self-aggregation is among the most striking features emerging from radiative-convective equilibrium simulations, but its relevance to convective disturbances observed in the real atmosphere remains under debate. This work seeks the observational signals of convective aggregation intrinsic to the life cycle of cloud clusters. To this end, composite time series of the Simple Convective Aggregation Index (SCAI), a metric of aggregation, and other variables from satellite measurements are constructed around the temporal maxima of precipitation. All the parameters analyzed are large-scale means over 108 3 108 domains. The composite evolution for heavy precipitation regimes shows that cloud clusters are gathered into fewer members during a period of 612 h as precipitation picks up. The high-cloud cover per cluster expands as the number of clusters drops, suggesting a transient occurrence of convective aggregation. The sign of the transient aggregation is less evident or entirely absent in light precipitation regimes. An energy budget analysis is performed in search of the physical processes underlying the transient aggregation. The column moist static energy (MSE) accumulates before the precipitation peak and dissipates after, accounted for primarily by the horizontal MSE advection. The domain-averaged column radiative cooling is greater in a more aggregated composite than in a less aggregated one, although the role of radiative-convective feedback behind this remains unclear. © 2021 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
英文关键词	Convection; Convective clouds; Satellite observations; Tropics
语种	英语
scopus关键词	Aggregates; Budget control; Radiative Cooling; Aggregation index; Heavy precipitation; Moist static energy; Number of clusters; Physical process; Precipitation regimes; Radiative-convective equilibrium; Satellite measurements; Precipitation (meteorology); atmospheric convection; cluster analysis; convective cloud; cooling; precipitation (climatology); radiative forcing; satellite imagery
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178702
作者单位	Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan; Department of Meteorology, University of Reading, Reading, United Kingdom; LMD/IPSL, CNRS, Sorbonne Universities, University Pierre and Marie Curie, Paris, France
推荐引用方式 GB/T 7714	Masunaga H.,Holloway C.E.,Kanamori H.,et al. Transient aggregation of convection: Observed behavior and underlying processes[J],2021,34(5).
APA	Masunaga H.,Holloway C.E.,Kanamori H.,Bony S.,&Stein T.H.M..(2021).Transient aggregation of convection: Observed behavior and underlying processes.Journal of Climate,34(5).
MLA	Masunaga H.,et al."Transient aggregation of convection: Observed behavior and underlying processes".Journal of Climate 34.5(2021).