ACCESS-TC: vortex specification, 4DVAR initialization, verification, and structure diagnostics

Davidson, Noel E., Xiao, Yi, Ma, Yimin, Weber, Harry C., Sun, Xudong, Rikus, Lawrie J., Kepert, Jeff D., Steinle, Peter X., Dietachmayer, Gary S., Lok, Charlie C.F., Fraser, James, Fernon, Joan, and Hakeem, Shaik (2014) ACCESS-TC: vortex specification, 4DVAR initialization, verification, and structure diagnostics. Monthly Weather Review, 142 (3). pp. 1265-1289.

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The Australian Community Climate and Earth System Simulator (ACCESS) has been adapted for operational and research applications on tropical cyclones. The base system runs at a resolution of 0.11 and 50 levels. The domain is relocatable and nested in coarser-resolution ACCESS forecasts. Initialization consists of five cycles of four-dimensional variational data assimilation (4DVAR) over 24h. Forecasts to 72h are made. Without vortex specification, initial conditions usually contain a weak and misplaced circulation pattern. Significant effort has been devoted to building physically based, synthetic inner-core structures, validated using historical dropsonde data and surface analyses from the Atlantic. Based on estimates of central pressure and storm size, vortex specification is used to filter the analyzed circulation from the original analysis, construct an inner core of the storm, locate it to the observed position, and merge it with the large-scale analysis at outer radii.

Item ID: 54839
Item Type: Article (Research - C1)
ISSN: 1520-0493
Funders: National Oceanographic Partnership Program (NOPP), Office of Naval Research (ONR)
Projects and Grants: ONR Award N000141010139
Date Deposited: 13 Nov 2018 00:27
FoR Codes: 04 EARTH SCIENCES > 0401 Atmospheric Sciences > 040102 Atmospheric Dynamics @ 50%
04 EARTH SCIENCES > 0401 Atmospheric Sciences > 040107 Meteorology @ 50%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970104 Expanding Knowledge in the Earth Sciences @ 100%
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