Tuesday, 8 January 2013: 8:45 AM
Room 9B (Austin Convention Center)
Taking advantage of the latest development of WRF tangent linear and adjoint model (WRFPLUS), the community regional GSI analysis system has been coupled with WRFPLUS to construct a GSI-based WRF 4D-Var. Firstly, the single observation experiment will be presented to demonstrate the implicit evolvement of the flow-dependent background error covariance of 4D-Var; Next, a 10-day 4D-Var analysis/forecast experiment is conducted and in compared with the 3D-Var experiments. In terms of verification score, the 4D-Var beats 3D-Var. Finally, the 4D-Var system runs with different number of processors and the computational efficiency is investigated.
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