Accession Number : ADA190131

Title :   Derivation of Consistent Surface Fixed Fields for use in a Global NWP Model.

Descriptive Note : Interim rept. 1 Oct 86-30 Sep 87,

Corporate Author : ISRAEL OCEANOGRAPHIC AND LIMNOLOGICAL RESEARCH LTD HAIFA

Personal Author(s) : Brenner, Stephen

PDF Url : ADA190131

Report Date : 30 Nov 1987

Pagination or Media Count : 18

Abstract : This report describes a method for generating a consistent set of surface fixed fields for use in a global NWP model. These fields include orography, the land sea mask and the sea surface temperature. The method is based on two principles. First, the interpolation from the higher resolution data grid to the coarser resolution model grid is done with a local filtering or analysis technique. Second, the three analyzed fields are kept consistent by using the same method and filter parameters for each field. The basic orographic data set is the 1 X 1 degree Sripps data. This is used to produce the model grid values of orography and the land sea mask. The basic data for the sea surface temperature consists of monthly mean values on the 2.5 X 2.5 degree grid used by NMC. For the orography and land sea mask, we first use the basic data to generate values on the 2.5 X 2.5 degree grid. Then all three fields are interpolated to the model grid. The resulting land sea mask also allows for fractional land coverage at model grid points. Keywords: Land sea contrast; Numerical weather forecasting; Atmosphere models; Surface fields.

Descriptors :   *ATMOSPHERE MODELS, *NUMERICAL ANALYSIS, *OROGRAPHY, *WEATHER FORECASTING, AREA COVERAGE, CONSISTENCY, DATA BASES, GRIDS, GRIDS(COORDINATES), HIGH RESOLUTION, INTERPOLATION, LAND AREAS, OCEAN SURFACE, RESOLUTION, SEA WATER, SURFACE TEMPERATURE, MARINE ATMOSPHERES, MATHEMATICAL FILTERS

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE