| DOI: | 10.1002/2017MS000981
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| Scopus记录号: | 2-s2.0-85037341407
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| 论文题名: | Understanding Mesoscale Aggregation of Shallow Cumulus Convection Using Large-Eddy Simulation |
| 作者: | Bretherton C; S; , Blossey P; N
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| 刊名: | Journal of Advances in Modeling Earth Systems
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| ISSN: | 19422466
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| 出版年: | 2017
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| 卷: | 9, 期:8 | | 起始页码: | 2798
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| 结束页码: | 2821
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| 语种: | 英语
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| 英文关键词: | Agglomeration
; Boundary layers
; Budget control
; Clouds
; Cumulus convection
; Marine shallow cumulus convection
; Mesoscale
; Mesoscale cellular convection
; Mesoscale circulation
; Potential temperature
; Shallow cumulus convection
; Weak temperature gradient approximations
; Large eddy simulation
; advection
; aggregation
; boundary layer
; convection
; cooling
; cumulus
; humidity
; large eddy simulation
; mesoscale eddy
; temperature gradient
; Hawaii County
; Hawaii [United States]
; United States
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| 英文摘要: | Marine shallow cumulus convection, often mixed with thin stratocumulus, is commonly aggregated into mesoscale patches. The mechanism and conditions supporting this aggregation are elucidated using 36 h large-eddy simulations (LES) on a 128 × 128 km doubly periodic domain, using climatological summertime forcings for a location southeast of Hawaii. Within 12 h, mesoscale patches of higher humidity, more vigorous cumulus convection, and thin detrained cloud at the trade inversion base develop spontaneously. Mesoscale 16 × 16 km subdomains are composited into quartiles of column total water path and their heat and moisture budgets analyzed. The weak temperature gradient approximation is used to explain how apparent heating perturbations drive simulated mesoscale circulations, which in turn induce relative moistening of the moistest subdomains, a form of gross moist instability. Self-aggregation is affected by precipitation and mesoscale feedbacks of radiative and surface fluxes but still occurs without them. In that minimal-physics setting, the humidity budget analysis suggests self-aggregation is more likely if horizontal-mean humidity is a concave function of the horizontal-mean virtual potential temperature, a condition favored by radiative cooling and cold advection within the boundary layer. © 2017. The Authors. |
| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/75692
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| Appears in Collections: | 影响、适应和脆弱性
气候变化与战略
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作者单位: | Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States
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| Recommended Citation: | |
Bretherton C,S,, Blossey P,et al. Understanding Mesoscale Aggregation of Shallow Cumulus Convection Using Large-Eddy Simulation[J]. Journal of Advances in Modeling Earth Systems,2017-01-01,9(8)
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