DOI: 10.1002/2017JD027345
论文题名: The influence of topography on midlatitude cyclones on Australia's east coast
作者: Pepler A.S. ; Alexander L.V. ; Evans J.P. ; Sherwood S.C.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
语种: 英语
英文关键词: Australia
; Midlatitude cyclone
; Regional climate models
; Topography
英文摘要: The east coast of Australia has a relatively high frequency of midlatitude cyclones, locally known as East Coast Lows (ECLs), which can cause severe weather including widespread flooding and coastal erosion. The elevated topography close to the east coast has been hypothesized to play a role in both the genesis and impacts of cyclones in this region, but existing studies have been limited to case studies of individual events. In this paper we present the results from two 20 year simulations over the Australian region using the Weather Research and Forecasting Model and assess the results from removing all topography in the region on both mean atmospheric circulation and ECL frequency. Removing topography results in an increase in sea level pressure to the south of Australia and an increase in moisture flux convergence and rainfall near the east coast, as well as a decrease in potential vorticity to the north of the ECL region. This results in a change in the spatial distribution of cyclones, with a 37% decrease in the frequency of cyclones that develop to the south of the ECL region but a 20% increase in cyclones near the east coast. This results in little overall change in the frequency of ECLs and suggests that coarse topography is unlikely to be responsible for the difficulties in simulating coastal cyclones in global climate models. ©2017. 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/62765
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: Climate Change Research Centre University of New South Wales Sydney, New South Wales Australia; Australian Research Council Centre of Excellence for Climate System Science Sydney, New South Wales Australia
Recommended Citation:
Pepler A.S.,Alexander L.V.,Evans J.P.,et al. The influence of topography on midlatitude cyclones on Australia's east coast[J]. Journal of Geophysical Research: Atmospheres,2017-01-01