西北太平洋热带气旋与上层海洋热含量的关系

利用SODA(Simple Ocean Data Assimilation)的海温资料和Unisys Weather的热带气旋资料,研究了1960-2008年期间北太平洋上层150 m的热含量分布特征及其与西北太平洋热带气旋发生频次的关系。考虑了纬度的变化对热含量的影响后,北太平洋热含量的高值中心位于10°N左右,与上层海温结构相符,计算结果更加符合物理意义。北太平洋热含量与西北太平洋热带气旋频数年际相关性研究表明在北太平洋中高纬度大洋内区和赤道东太平洋热带不稳定波发生区呈现出前期冬季正相关性。此相关性存在显著年代际的变化,在1970-1975年和1984-2008年期间最强,1976-1983年期间较弱。在北太平洋中高纬度大洋内区,同期春夏秋季同样存在强正相关。在西太平洋暖池区,同期秋季负相关最为显著。赤道中太平洋区域在夏季呈显著的正相关,秋季减弱。赤道东太平洋海域的相关性前期冬季负相关最为显著,春季负相关性减弱,夏季和秋季无显著相关。

The relationship between tropical cyclone in the northwest Pacific and upper ocean heat content

Based on SODA datasets and the tropical cyclone data from Unisys Weather, the heat content distribution characteristics of upper ocean 150 m and its relationship between tropical cyclone frequency in the northwest Pacific from 1960 to 2008 are studied. After considering the changes of heat content with latitudes, the maximum heat content in the North Pacific is located at 10°N, which is consistent with the upper ocean temperature structures and more reasonable in physics.The relationships of the heat content in the North Pacific and tropical cyclone frequency in the northwest Pacific show pre-winter positive correlation in the middle and high latitudes of the interior North Pacific and equatorial eastern Pacific where tropical instability waves occurred. And the correlation coefficient show significant interdecadal variations which indicate stronger correlation from 1970 to 1976 and 1984 to 2008 and weaker from 1975 to 1983. In the middle and high latitudes of the interior North Pacific, the same summer and autumn also have strong positive correlation. In the western Pacific warm pool, the negative correlation in the same autumn is most significant. The equatorial middle Pacific shows a significant positive correlation in the summer and autumn. In the equatorial eastern Pacific, the pre-winter negative correlation is most significant, negative correlation weakened in the same spring, and no significant correlation in summer and autumn.