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Simulation experiments of surface pressure analyses with optimum interpolation
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  • Description:
    "Scatterometer-derived data from the SEASAT-A satellite will provide fine resolution surface wind vectors over the ocean. Presumably, these data may improve the surface pressure analyses currently generated by sparsely available ship reports. The improved surface pressure analysis may also be included in a global data assimilation system in NMC (McPherson et al.,1979). While awaiting the arrival of the SEASAT-A wind data, we have decided to run a series of simulation experiments on surface pressure analyses using conventional ship wind and pressure reports. The main purpose of these experiments is to study the effect of ship wind data on surface pressure analyses. It is anticipated that results of this study might supply information on the potential impact of the SEASAT-A wind data. This paper describes results of the simulation experiments on surface pressure analyses by a modified version of the optimum interpolation scheme currently operational in NMC (Bergman, 1979). It should be pointed out that Druyan (1972) has performed similar experiments using a boundary layer model of Cardone (1969) for calculating surface pressures. He concluded that ship winds contribute substantially to the specification of sea level pressure. Since we are mainly interested in large-scale synoptic pressure waves, we used an experimental design different from that of Druyan (1972). Section 2 discusses the details of the design. Test results are presented in Section 3; and in Section 4, a brief concluding remark is given"--Introduction.

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