globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2015MS000498
Scopus记录号: 2-s2.0-84959507321
论文题名:
Global-scale convective aggregation: Implications for the Madden-Julian Oscillation
作者: Arnold N; P; , Randall D; A
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2015
卷: 7, 期:4
起始页码: 1499
结束页码: 1518
语种: 英语
英文关键词: Agglomeration ; Air entrainment ; Budget control ; Cams ; Cloud system-resolving models ; Convective envelope ; Entrainment rates ; Madden-Julian oscillation ; MJO ; Moist static energy ; Radiative-convective equilibrium ; RCE ; Climatology ; aggregation ; atmospheric general circulation model ; convective system ; diabatic process ; entrainment ; general circulation model ; global climate ; longwave radiation ; Madden-Julian oscillation ; sea surface temperature ; temperature anomaly
英文摘要: Previous work has shown that convection will self-organize in cloud-system-resolving model simulations of radiative-convective equilibrium, and it has been suggested that the convective envelope of the Madden-Julian oscillation (MJO) may be organized by similar processes on a much larger scale. Here we present support for that hypothesis based on simulations with SP-CAM with globally uniform SST. Without rotation, convection self-organizes into large (-4000 km) clusters surrounded by dry regions, while with Earth-like rotation the model produces a robust MJO. The nonrotating aggregation and MJO are found to have similar budgets of moist static energy, both being supported by diabatic feedbacks, particularly cloud-longwave interaction. Mechanism denial experiments show that longwave heating anomalies associated with high clouds are essential to the nonrotating aggregation, and amplify the MJO. Simulations using the conventional CAM show a weaker MJO and a much weaker tendency for nonrotating aggregation, and both MJO activity and aggregation intensity are found to increase with the entrainment rate in the deep convection parameterization. © 2015. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75970
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 Science, Colorado State University, Fort Collins, Colorado, United States; Now at Global Modeling and Assimilation Office, NASA Goddard Space Flight Center, Greenbelt, Maryland, United States

Recommended Citation:
Arnold N,P,, Randall D,et al. Global-scale convective aggregation: Implications for the Madden-Julian Oscillation[J]. Journal of Advances in Modeling Earth Systems,2015-01-01,7(4)
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