DOI: 10.1175/JCLI-D-11-00258.1
Scopus记录号: 2-s2.0-84867686898
论文题名: Observational evidence for relationships between the degree of aggregation of deep convection, water vapor, surface fluxes, and radiation
作者: Tobin I. ; Bony S. ; Roca R.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 20 起始页码: 6885
结束页码: 6904
语种: 英语
Scopus关键词: Climate variability and change
; Data sets
; Deep convection
; Degree of aggregation
; Large-scale dynamics
; Outgoing longwave radiation
; Radiative heating
; Short-wave radiation
; Spatial organization
; Surface flux
; Top of the atmospheres
; Tropical ocean
; Upper troposphere
; Water and energies
; Atmospheric humidity
; Atmospheric thermodynamics
; Clouds
; Natural convection
; Surface measurement
; Troposphere
; Vapors
; Radiation effects
; atmospheric convection
; climate change
; climate variation
; cloud cover
; humidity
; longwave radiation
; numerical model
; shortwave radiation
; surface flux
; troposphere
; turbulent flow
; water vapor
英文摘要: Tropical deep convection exhibits complex organization over a wide range of scales. This study investigates the relationships between the spatial organization of deep convection and the large-scale atmospheric state. By using several satellite datasets and reanalyses, and by defining a simple diagnostic of convective aggregation, relationships between the degree of convective aggregation and the amount of water vapor, turbulent surface fluxes, and radiation are highlighted above tropical oceans. When deep convection is more aggregated, the middle and upper troposphere are drier in the convection-free environment, turbulent surface fluxes are enhanced, and the low-level and midlevel cloudiness is reduced in the environment. Humidity and cloudiness changes lead to a large increase in outgoing longwave radiation. Cloud changes also result in reduced reflected shortwave radiation. Owing to these opposing effects, the sensitivity of the radiative budget at the top of the atmosphere to convective aggregation turns out to be weak, but the distribution of radiative heating throughout the troposphere is affected. These results suggest that feedbacks between convective aggregation and the large-scale atmospheric state might influence large-scale dynamics and the transports of water and energy and, thus, play a role in the climate variability and change. These observational findings are qualitatively consistent with previous cloud-resolvingmodel results, except for the effects on cloudiness and reflected shortwave radiation. The proposed methodology may be useful for assessing the representation of convective aggregation and its interaction with the large-scale atmospheric state in various numerical models. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52217
Appears in Collections: 气候变化事实与影响
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作者单位: Laboratoire de Meteorologie Dynamique, Institut Pierre Simon Laplace, CNRS, and University Pierre and Marie Curie, Paris, France
Recommended Citation:
Tobin I.,Bony S.,Roca R.. Observational evidence for relationships between the degree of aggregation of deep convection, water vapor, surface fluxes, and radiation[J]. Journal of Climate,2012-01-01,25(20)