套网格预报中几种边界条件的试验

采用国家气象中心五层原始方程业务模式，用单向自嵌套方法，对常用的几种侧边界条件进行了对比试验。结果表明：加密网络可以改善预报效果，在试验的几种边界处理方案中，以Ｄａｖｉｅｓ方案的效果最好，不需要采用其他技术处理，就能使边界附近不产生扰动，分析的等值线光滑，计算稳定性好，可以使业务预报更加可靠，效果更加理想。

EXPERIMENTS WITH SEVERAL TYPES OF BOUNDARY CONDITIONS IN NESTED GRID PREDICTION

A five-level primitive equation operational model developed by the US NMC is used incontrol experimenting with several types of lateral boundary conditions commonly used in termsof the one-way automatic nesting method.Results show that the intensive grid scheme canimprove the accuracy and,of the boundary-handling schemes,Davies technique is optimal thatcauses no disturbance in the vicinity of the boundary and produces smooth isolines and highstability without the help of other treatment.The scheme is useful in making operationalprediction more accurate.