DOI: 10.1175/JCLI-D-16-0125.1
Scopus记录号: 2-s2.0-85014523830
论文题名: Observed relationships between cloud vertical structure and convective aggregation over tropical ocean
作者: Stein T.H.M. ; Holloway C.E. ; Tobin I. ; Bony S.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 6 起始页码: 2187
结束页码: 2207
语种: 英语
Scopus关键词: Atmospheric temperature
; Clouds
; Heat convection
; Oceanography
; Optical radar
; Rain
; Submarine geophysics
; Surface properties
; Surface waters
; Tropics
; Brightness temperatures
; Cloud distributions
; Cloud vertical structure
; Degree of aggregation
; Low-level cloud covers
; Precipitation efficiency
; Satellite observations
; Sea surface temperature (SST)
; Precipitation (meteorology)
; CALIPSO
; cirrus
; cloud cover
; cloud microphysics
; CloudSat
; convective system
; marine atmosphere
; rainfall
; satellite data
; sea surface temperature
; tropical region
英文摘要: Using the satellite-infrared-based Simple Convective Aggregation Index (SCAI) to determine the degree of aggregation, 5 years of CloudSat-CALIPSO cloud profiles are composited at a spatial scale of 10 degrees to study the relationship between cloud vertical structure and aggregation. For a given large-scale vertical motion and domain-averaged precipitation rate, there is a large decrease in anvil cloud (and in cloudiness as a whole) and an increase in clear sky and low cloud as aggregation increases. The changes in thick anvil cloud are proportional to the changes in total areal cover of brightness temperatures below 240 K [cold cloud area (CCA)], which is negatively correlated with SCAI. Optically thin anvil cover decreases significantly when aggregation increases, even for a fixed CCA, supporting previous findings of a higher precipitation efficiency for aggregated convection. Cirrus, congestus, and midlevel clouds do not display a consistent relationship with the degree of aggregation. Lidar-observed low-level cloud cover (where the lidar is not attenuated) is presented herein as the best estimate of the true low-level cloud cover, and it is shown that it increases as aggregation increases. Qualitatively, the relationships between cloud distribution and SCAI do not change with sea surface temperature, while cirrus clouds are more abundant and low-level clouds less at higher sea surface temperatures. For the observed regimes, the vertical cloud profile varies more evidently with SCAI than with mean precipitation rate. These results confirm that convective scenes with similar vertical motion and rainfall can be associated with vastly different cloudiness (both high and low cloud) and humidity depending on the degree of convective aggregation. © 2017 American Meteorological Society.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49746
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Meteorology, University of Reading, Reading, United Kingdom; LSCE/IPSL/CNRS, Gif sur Yvette, France; LMD/IPSL, CNRS, UPMC, Paris, France
Recommended Citation:
Stein T.H.M.,Holloway C.E.,Tobin I.,et al. Observed relationships between cloud vertical structure and convective aggregation over tropical ocean[J]. Journal of Climate,2017-01-01,30(6)