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The influence of topography on midlatitude cyclones on Australia's east coast
- Source :
- Journal of Geophysical Research: Atmospheres. 122:9173-9184
- Publication Year :
- 2017
- Publisher :
- American Geophysical Union (AGU), 2017.
-
Abstract
- 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 WRF simulations over the Australian region, 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 coarse topography is unlikely to be responsible for the difficulties in simulating coastal cyclones in global climate models.
- Subjects :
- Atmospheric Science
010504 meteorology & atmospheric sciences
Severe weather
Atmospheric circulation
0208 environmental biotechnology
02 engineering and technology
Spatial distribution
01 natural sciences
020801 environmental engineering
Coastal erosion
Geophysics
Space and Planetary Science
Potential vorticity
Middle latitudes
Climatology
Weather Research and Forecasting Model
Earth and Planetary Sciences (miscellaneous)
Cyclone
Geology
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 21698996 and 2169897X
- Volume :
- 122
- Database :
- OpenAIRE
- Journal :
- Journal of Geophysical Research: Atmospheres
- Accession number :
- edsair.doi...........2df5b3af42e62cfa4643f23c6138cdff