气候变化领域集成服务门户(CCPortal): Physical Mechanisms Controlling the Offshore Propagation of Convection in the Tropics: 2. Influence of Topography

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DOI	10.1029/2019MS001794
	Physical Mechanisms Controlling the Offshore Propagation of Convection in the Tropics: 2. Influence of Topography
	Coppin D.; Bellon G.
发表日期	2019
ISSN	19422466
起始页码	3251
结束页码	3264
卷号	11 期号:10
英文摘要	A set of idealized convection-permitting simulations is performed to investigate the influence of topography on the physical mechanisms responsible for the nocturnal offshore propagation of convection around tropical islands. All simulations have an idealized island in the middle of a long channel oceanic domain, with constant sea surface temperature and without rotation. To diagnose the impact of topography, we compare a flat island simulation with two simulations with mountain ranges of different shapes. The topography over the island has a strong impact on the diurnal cycle of convection as clouds tend to remain all day over the highest topography. This weakens the diurnal cycle and the land breeze front and triggers a comparatively less frequent long-distance offshore propagation of convection. As in the flat simulation, the distance of offshore propagation is particularly sensitive to humidity and temperature at the top of the boundary layer. A shallow circulation that is asymmetric with respect to the island influences the boundary layer top humidity and can favor propagation on one side of the island or the other. These results mimic cloud and precipitation patterns observed prior to the Madden-Julian Oscillation propagation over the Maritime Continent. The shape of the topography does not seem to influence the offshore propagation of convection significantly except for mountain-valley breezes that reinforce the land breeze and the establishment of the asymmetric shallow circulation. ©2019. The Authors.
英文关键词	convection; gravity waves; land breeze; offshore propagation; topography; tropical islands
语种	英语
scopus关键词	Boundary layers; Climatology; Gravity waves; Heat convection; Landforms; Oceanography; Offshore oil well production; Planetary surface analysis; Precipitation (meteorology); Surface waters; Tropics; Humidity and temperatures; Land breezes; Madden-Julian oscillation; Maritime Continent; Physical mechanism; Precipitation patterns; Sea surface temperature (SST); Tropical island; Topography; boundary layer; convection; gravity wave; land breeze; sea surface temperature; simulation; topography
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156843
作者单位	Department of Physics, University of Auckland, Auckland, New Zealand
推荐引用方式 GB/T 7714	Coppin D.,Bellon G.. Physical Mechanisms Controlling the Offshore Propagation of Convection in the Tropics: 2. Influence of Topography[J],2019,11(10).
APA	Coppin D.,&Bellon G..(2019).Physical Mechanisms Controlling the Offshore Propagation of Convection in the Tropics: 2. Influence of Topography.Journal of Advances in Modeling Earth Systems,11(10).
MLA	Coppin D.,et al."Physical Mechanisms Controlling the Offshore Propagation of Convection in the Tropics: 2. Influence of Topography".Journal of Advances in Modeling Earth Systems 11.10(2019).