ACCESS-TC: Vortex Specification, 4DVAR Initialization, Verification, and Structure Diagnostics

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 0.11DG and 50 levels. The domain is relocatable and nested in coarser-resolution ACCESS forecasts. Initializat...

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Bibliographic Details
Published in:Monthly weather review 2014-03, Vol.142 (3), p.1265-1289
Main Authors: 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, Shaik, Hakeem
Format: Article
Language:English
Subjects:
Aircraft
Circulation
Circulation patterns
Coarsening
Cyclones
Data assimilation
Data collection
Doppler radar
Dropsonde
Dropsondes
Experiments
Fluid flow
Historical structures
Hurricanes
Initial conditions
Marine
Maximum winds
Meteorology
Pressure
Rain
Sea level
Simulators
Specifications
Storms
Surface pressure
Tropical cyclones
Vortices
Weather forecasting
Wind
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Summary: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 0.11DG 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 24 h. Forecasts to 72 h 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.
ISSN:0027-0644
1520-0493
DOI:10.1175/MWR-D-13-00062.1