各种大气水汽输送气候计算方法的比较和讨论

COMPARISON OF DIFFERENT CLIMATOLOGICAL CULATION METHODS FOR WATER TRANSP ORTATION IN THE ATMOSPHERE WITH DISCUSSION

比较瞬时法、平均法和逐层平均法３种水汽输送气候计算方案，发现它们的输送方向大致相同，输送量差异显著。瞬时法最准确；逐层平均法次之，但误差的年际波动较大；平均法虽然简单然而误差大。

Comparison is made among three climatological calculation techniques for watertransfer in the atmosphere。They include the instantaneous,averaging and layer-to-layermean methods.Results show that all these methods are able to display roughly the same direction for water transfer but with remarkable difference in the amount,Comparison indicatesthat the instantaneous method is most accurate and layer-to-layer mean method next to it butwith rather a big interannual fluctuiation in errors.And the averaging technique,though sim-ple,is prone to produce large errors。