高原东部夏季潜热与西北太平洋台风强度关系的初步研究

Relationship between Summer Latent Heat in the Eastern Qinghai-Tibet Plateau and Intensity of Western North Pacific Typhoon

通过运用NCEP/NCAR月平均再分析资料,1975-2005年的高原东部夏季潜热资料,西北太平热带气旋资料,初步研究了气候背景下高原夏季潜热对西北太平洋区热带气旋(以下简称TC)强度的影响,指出夏季(7-9月)潜热强度与TC强度存在很好的反向变化特征,潜热强年TC偏弱,反之亦然。潜热引起西北太平洋环境场的垂直切变异常是导致TC强度变化的可能原因。

Using NCEP / NCAR monthly mean reanalysis data, summer latent heat data in eastern Qinghai- Tibet Plateau from 1975 to 2005, Northwest Pacific tropical cyclone（TC）data , the effect of the latent heat upon TC intensity was studied. It points out that the latent heat and TC intensity are inverse correlation in summer （July-September）. The Pacific Northwest environment field vertical shear anomalies caused by latent heat may be the possible reasons for TC intensity variations.