DOI: 10.1002/2015GL064534
论文题名: Observations of fair-weather cumuli over land: Dynamical factors controlling cloud size and cover
作者: Lamer K. ; Kollias P.
刊名: Geophysical Research Letters
ISSN: 0094-9269
EISSN: 1944-9000
出版年: 2015
卷: 42, 期: 20 起始页码: 8693
结束页码: 8701
语种: 英语
英文关键词: cloud base dynamics
; environmental factors correlation to cloud cover
; environmental thermodynamic structure
; modes of shallow convection
; observational challenges for shallow cumuli over land
; subcloud layer dynamics
Scopus关键词: Atmospheric humidity
; Atmospheric radiation
; Atmospheric structure
; Dynamics
; Higher order statistics
; Humidity control
; Cloud base
; Cloud cover
; Shallow convection
; Shallow cumulus
; Sub clouds
; Thermodynamic structures
; Clouds
; atmospheric convection
; cloud cover
; correlation
; cumulus
; environmental factor
; observational method
; radiative transfer
; relative humidity
; skewness
; thermodynamics
; updraft
; Great Plains
英文摘要: Comprehensive observations of shallow convection at the Atmospheric Radiation Measurement Southern Great Plains site are carefully analyzed to study the macrophysical and dynamical properties of active and forced cumuli separately and investigate their relationship to the subcloud layer turbulent structure. Clearly, active clouds possess stronger dynamics and greater horizontal extent than their forced counterpart. As previously reported, upper level stability and relative humidity do control the predominance of active clouds. While cloud cover remains difficult to associate to mixed-layer parameters (small correlation coefficients), mixed-layer top vertical velocity skewness, and coherent updraft fraction most significantly correlate to cumulus cloud cover and especially the portion attributed to active clouds; both of which are not currently considered in shallow cloudiness parameterizations. This study also points to several factors that continue to limit our ability to adequately sample shallow cumuli and suggests that forward models will be necessary to bridge observations and model outputs. Key Points Several factors that limit shallow convection observation over land are described Every hour, forced and active cumuli size and cloud base dynamics are quantified Mixed-layer top velocity skewness and coherent updraft fraction most correlate to cumuli cover © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84946595094&doi=10.1002%2f2015GL064534&partnerID=40&md5=12e55023e47dbefd04f1e0bb1fb4ff13
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8885
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Atmospheric and Oceanic Sciences, McGill University, Montreal, QC, Canada
Recommended Citation:
Lamer K.,Kollias P.. Observations of fair-weather cumuli over land: Dynamical factors controlling cloud size and cover[J]. Geophysical Research Letters,2015-01-01,42(20).