由数字化气压场计算海面风场

THE COMPUTATION OF SEA SURFACE WIND FIELD FROM A DIGITIZED AIR PRESSURE FIELD

根据数字化仪给出的天气图等压线与经线或纬线交点的数组(Φ,λ,P),采用Kriging网格化方法得出计算区域中1°×1°经纬度网格上的气压值。然后根据地转风与气压梯度间的关系,并经地理纬度和高度等订正。算出1°×1°网格点上海面10m高的风速。经与东沙气象站的实测风速比较,两者符合良好。

According to the weather charts in the two cold air processes in Jan. 1989 from Royal Observatory, Hong Kong, the data groups ( , λ, P) at the intersections of the isobars and longitudes or latitudes have been given by the digitized instrument. With the IBMGP drawing softwares the air pressure at 1 latitude by 1 longitude points in the calculated region is obtained by using the Kriging gridding method. And then according to the principle between the air pressure gradient and geos rophic wind,and . revision of latitudes and height etc, wind speeds at 1 latitude by 1 longitude grid points in the calculated region at 10m height from sea surface have been comouted. Comparison with the computed and observed wind speeds at Dongsha meteorological station in the weather charts indicats that they are quite agree.