摘要
运用欧洲中心ECMW F/ERA-40的资料,分析剩余环流速度v-*和w-*的变化,从而获得行星波的调整对气候的长期变化的影响。结果表明:赤道气流在低纬度赤道地区由对流层顶上升至平流层中层乃至顶部,而后在中纬度地区下沉,中心位置随季节变化在赤道附近南北移动;剩余环流呈现出准两年的周期变化,剩余速度v-*和w-*与行星波的振幅三者表现出较好的相关性。另外,行星波波数从1波调整为2波后,平流层低层50hPa以下剩余环流增强,30hPa之上减弱;行星波波数从2波调整为1波后,平流层中层30hPa以下剩余环流减弱,20hPa以上为增强。
Based on ECMWF/ERA-40 data, and the analysis of residual circulation speed （v·、W·）, the influence of planetary wave adjustments to the long-term climate were analyzed. The results showed that： the equatorial flow rises from the top of the troposphere to the middle or the top of the stratosphere. The central location moves northwards or southwards near the Equator with the seasons. The movements of the residual circulation show a quasi-two-year cycle. The speed and the amplitude of the residual circulation have a good correlation. In addition, when the planetary wave number adjusts from 1 to 2 , the residual stratospheric circulation strengthens （weakens） under （above） 500hPa. When the planetary wave number adjusts from 2 to 1 , the residual stratospheric circulation weakens （strengthens） under 30hPa （above 20hPa）.
出处
《气象研究与应用》
2009年第3期12-15,23,共5页
Journal of Meteorological Research and Application
关键词
行星波
平流层
剩余环流
Planetary wave
stratosphere
residual current
