DOI: 10.1002/jgrd.50547
论文题名: Land-lake breezes at low latitudes: The case of Tonle Sap Lake in Cambodia
作者: Tsujimoto K. ; Koike T.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 13 起始页码: 6970
结束页码: 6980
语种: 英语
英文关键词: land-atmosphere interaction
; land-breeze
Scopus关键词: Temperature
; Convective instabilities
; Environmental factors
; Fresh water lakes
; Katabatic winds
; Land-atmosphere interactions
; land-breeze
; Surface water temperature
; Tropical climates
; Lakes
; absorption
; air mass
; environmental factor
; lake water
; land breeze
; latitude
; linearity
; numerical model
; updraft
; water temperature
; Cambodia
; Tonle Sap Lake
英文摘要: Tonle Sap Lake is the largest freshwater lake in Southeast Asia. During the postmonsoon season, a small linear cloud system has been observed over this lake in early morning, while the sky above the surrounding land is clear. Although this cloud system is apparently generated by land breezes, previous studies on land-lake (sea) circulation have suggested that environmental factors at low latitudes inhibit development of nocturnal land breezes. In this study, we investigate the mechanism of these early morning clouds through numerical simulation. The simulations show a linear updraft system over the lake, forming along the southwest lakeshore around 22:00 and moving northeast to the middle of the lake. The heavier air mass from the land meets the extraordinarily warm and humid air mass over the lake, triggering updrafts under the conditionally convective instability. The characteristic high surface water temperature was favorable for generation of the land breeze and updraft systems. That high surface water temperature of the lake is produced by the tropical climate along with efficient energy absorption because of the shallowness of the water body. This unique feature can generate a clear nocturnal land breeze circulation accompanying a migrating updraft system over the lake despite its low latitude. Key Points Land-breeze develops even though this lake is located in the low-latitudes. A lined-up cloud is formed at night over the lake by the very hot lake water. The convection migrates over the lake by the katabatic wind. ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63582
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Civil Engineering, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
Recommended Citation:
Tsujimoto K.,Koike T.. Land-lake breezes at low latitudes: The case of Tonle Sap Lake in Cambodia[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(13)