Analysis of Australian monsoon lows using WRF model

Hakeem, Shaik (2017) Analysis of Australian monsoon lows using WRF model. In: [Presented at the Australian Meteorological and Oceanographic Society and the Meteorological Society of New Zealand Conference]. From: Australian Meteorological and Oceanographic Society and Meteorological Society of New Zealand, 7-10 February 2017, Canberra, ACT, Australia.

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Abstract

Though the monsoon lows in Australian Monsoon are not as significantly defined as Indian monsoon depressions (lows), they are distinct features of Australian monsoon. These lows contribute to a significant portion of north Australian seasonal rainfall. Two cases of north Australian Monsoon lows were analysed using the Weather Research and Forecast Model (WRF) of James Cook University (JCU). The WRF model at JCU was the version 3.7 of the Advanced Research WRF model. The model domain was set to 4.5N to 35S and 110E to 180E with 75km horizontal grid and 30 vertical levels. Standard physics and dynamic parameters were used for the runs. One of the lows under study was formed over northwestern Australian coast during first week of January 2010 and the other low formed over the Gulf of Carpentaria coast during second week of February 2014. Both lows did not reach the cyclone intensity but caused widespread rainfall over the region.

Time and height cross section of vertical wind field, Absolute Vorticity, divergence, zonal and meridional wind cross sections were presented. Analysis of the maps showing the Mean Sea Level Pressure, 850hPa wind field, precipitable water content for 3 days for January 2010 and 4 days for February 2014 were presented.

Over all the model could capture the variation of pressure and wind field structure. Weakening of the vertical velocity field during the passage of the low and Changes in the divergence and vorticity fields were well captured. Some of the diagnostics of these lows were discussed.

Item ID: 55011
Item Type: Conference Item (Presentation)
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Date Deposited: 11 Dec 2018 00:44
FoR Codes: 04 EARTH SCIENCES > 0401 Atmospheric Sciences > 040107 Meteorology @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970104 Expanding Knowledge in the Earth Sciences @ 100%
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