摘要
利用观测资料分析了冬季太平洋海表温度异常对风暴轴和急流的影响。结果表明：在冬季黑潮区域正ＳＳＴ异常时，风暴轴和急流均明显北移，并且风暴轴的强度在入口区显著增强，急流核的中心强度却变化不大；而在冬季赤道中、东太平洋地区正ＳＳＴ异常时，风暴轴和急流主要向东南方向明显扩展，强度也在太平洋中东部显著增强，但急流核的中心强度同样变化不大。进一步分析显示，急流的位置和强度变化主要受热带与副热带温度梯度大小变化的影响，而风暴轴的位置和强度变化不仅与急流有关，还主要与非绝热加热效应所直接引起的斜压性增强密切相关。
Observational analysis is conducted of the effects of winter Pacific SSTA on the storm track and jet stream.It is shown that the positive Kuroshio (equatorial central and eastern Pacific) SSTA in winter can give rise to northward (east and south ward) movement of both the storm track and jet stream, and lead to substantial enhancement in the entrance aera of the storm track (central and eastern Pacific), but leave the center of jet stream little variation in intensity.As such, the jet stream varies in position and intensity mainly as a result of the change of temperature gradient in the tropics and subtropics,while the variation of the storm track in position and intensity is not only related to the jet stream,but also to the intensified baroclinicity which is mainly caused by diabatic heating.
出处
《南京气象学院学报》
CSCD
1999年第4期575-581,共7页
Journal of Nanjing Institute of Meteorology
基金
国家自然科学基金!49475258
