2002 Annual

Monday, 14 January 2002
Using 4d-Var to assimilate satellite data into MM5 Hurricane Floyd simulations
Sharanya J. Majumdar, Univ. of Miami/RSMAS, Miami, FL; and S. S. Chen, J. Tenerelli, and R. Foster
A major difficulty in hurricane forecasting is the specification of accurate initial conditions that are dynamically consistent with the numerical model. Furthermore, a large quantity of available data are not fully exploited in current operational data assimilation schemes. As an initial step towards improving data assimilation in tropical cyclone forecasts, a 4d-Var scheme is used to assimilate QuikScat and AMSU satellite data into the MM5 model in the vicinity of the incipient Hurricane Floyd. Comparisons of the 4d-Var results versus existing high- and low- resolution MM5 simulations and 3d-Var assimilations will be presented.

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