DOI: 10.1007/s00382-015-2893-6
Scopus记录号: 2-s2.0-84946114670
论文题名: Precipitation over urban areas in the western Maritime Continent using a convection-permitting model
作者: Argüeso D. ; Di Luca A. ; Evans J.P.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 47, 期: 2017-03-04 起始页码: 1143
结束页码: 1159
语种: 英语
英文关键词: Convection
; Convection-permitting models
; Maritime Continent
; Precipitation
; Regional climate modelling
; Urban climate
英文摘要: This study investigates the effects of urban areas on precipitation in the western Maritime Continent using a convection-permitting regional atmospheric model. The Weather Research and Forecasting model was used to simulate the atmosphere at a range of spatial resolutions using a multiple nesting approach. Two experiments (with and without urban areas) were completed over a 5-year period (2008–2012) each to estimate the contribution of cities to changes in local circulation. At first, the model is evaluated against two satellite-derived precipitation products and the benefit of using a very high-resolution model (2-km grid spacing) over a region where rainfall is dominated by convective processes is demonstrated, particularly in terms of its diurnal cycle phase and amplitude. The influence of cities on precipitation characteristics is quantified for two major urban nuclei in the region (Jakarta and Kuala Lumpur) and results indicate that their presence locally enhances precipitation by over 30 %. This increase is mainly due to an intensification of the diurnal cycle. We analyse the impact on temperature, humidity and wind to put forward physical mechanisms that explain such changes. Cities increase near surface temperature, generating instability. They also make land-sea temperature contrasts stronger, which enhances sea breeze circulations. Together, they increase near-surface moisture flux convergence and favour convective processes leading to an overall increase of precipitation over urban areas. The diurnal cycle of these effects is reflected in the atmospheric footprint of cities on variables such as humidity and cloud mixing ratio and accompanies changes in precipitation. © 2015, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53599
Appears in Collections: 过去全球变化的重建
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作者单位: ARC Centre of Excellence for Climate System Science, University of New South Wales, Sydney, Australia; Climate Change Research Centre, Level 4, Matthews Building, University of New South Wales, Sydney, NSW, Australia
Recommended Citation:
Argüeso D.,Di Luca A.,Evans J.P.. Precipitation over urban areas in the western Maritime Continent using a convection-permitting model[J]. Climate Dynamics,2016-01-01,47(2017-03-04)