| DOI: | 10.1002/2015GL064260
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| 论文题名: | What favors convective aggregation and why? |
| 作者: | Muller C.; Bony S.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9363
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| EISSN: | 1944-9094
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| 出版年: | 2015
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| 卷: | 42, 期:13 | | 起始页码: | 5626
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| 结束页码: | 5634
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| 语种: | 英语
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| 英文关键词: | cloud-resolving model
; radiative-convective equilibrium
; radiative-convective instability
; self-aggregation
; tropical convection
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| Scopus关键词: | Budget control
; Moisture
; Storms
; Cloud resolving model
; Convective instabilities
; Radiative-convective equilibrium
; Self aggregation
; Tropical convection
; Cooling
; aggregation
; atmospheric convection
; energy flux
; longwave radiation
; moisture flux
; radiation budget
; tropical cyclone
; tropical meteorology
; vertical profile
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| 英文摘要: | The organization of convection is ubiquitous, but its physical understanding remains limited. One particular type of organization is the spatial self-aggregation of convection, taking the form of cloud clusters, or tropical cyclones in the presence of rotation. We show that several physical processes can give rise to self-aggregation and highlight the key features responsible for it, using idealized simulations. Longwave radiative feedbacks yield a "radiative aggregation." In that case, sufficient spatial variability of radiative cooling rates yields a low-level circulation, which induces the upgradient energy transport and radiative-convective instability. Not only do vertically integrated radiative budgets matter but the vertical profile of cooling is also crucial. Convective aggregation is facilitated when downdrafts below clouds are weak ("moisture-memory aggregation"), and this is sufficient to trigger aggregation in the absence of longwave radiative feedbacks. These results shed some light on the sensitivity of self-aggregation to various parameters, including resolution or domain size. Key Points Longwave radiative feedbacks can trigger a radiative aggregation The vertical profile of radiative cooling is crucial for self-aggregation Conditions favoring weak downdrafts can trigger a moisture-memory aggregation. © 2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84938150157&doi=10.1002%2f2015GL064260&partnerID=40&md5=da978a7d9f99816a1314c97c199fb6f1
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| 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/8978
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| 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: | CNRS, Laboratoire d'Hydrodynamique de l'École Polytechnique, Palaiseau, France
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| Recommended Citation: | |
Muller C.,Bony S.. What favors convective aggregation and why?[J]. Geophysical Research Letters,2015-01-01,42(13).
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