Original Research Papers
Physical initialization using SSM/I rain rates
Authors:
- T. N. KrishnamurtiEmail T. N. Krishnamurti
- H. S. Bedi
- Kevin Ingles
Abstract
Following our recent study on physical initialization for tropical prediction using rain rates based on outgoing long-wave radiation, the present study demonstrates a major improvement from the use of microwave radiance based rain rates. A rain rate algorithm is used on the data from a special sensor microwave instrument (SSM/1). The initialization, as before, uses a reverse surface similarity theory, a reverse cumulus parameterization algorithm and a bisection method to minimize the difference between satellite-based and the model-based outgoing long-wave radiation. These are invoked within a preforecast Newtonian relaxation phase of the initialization. These tests are carried out with a high-resolution global spectral model. The impact of the initialization on forecast is tested for a complex triple typhoon scenario over the Western Pacific Ocean during September 1987. A major impact from the inclusion of the SSM/I is demonstrated. Also addressed are the spin-up issues related to the typhoon structure and the improved water budget from the physical initialization.
- Year: 1993
- Volume: 45 Issue: 4
- Page/Article: 247-269
- DOI: 10.3402/tellusa.v45i4.14890
- Submitted on 17 Aug 1992
- Accepted on 17 May 1993
- Published on 1 Jan 1993
- Peer Reviewed