摘要
本文利用9层菱形截断15波的全球大气环流谱模式进行了7月份南极冰正常和无冰的对比试验,进而研究了南极冰的短期气候效应.结果表明:南极冰的移去首先在局地区域加热了低层空气,减弱了南极极涡,然后使中高纬度超长波发生变异尤其是使纬向3波增幅.超长波的异常引起东亚季风区低层越赤道气流加强,从而增强东亚季风环流,增大中南半岛到西太平洋的降雨量和相应的对流潜热释放,结果在北半球激发了一支从东亚到北美的二维Rossby波列,使北半球大气环流发生异常.文中对这一气候效应的动力学机制进行了讨论,并认为南极冰不仅是影响南半球环流异常而且也是影响亚洲季风甚至是北半球环流异常的重要因子.
The short- term climatic effect induced by the removal of Antarctic sea ice is studied with a perpetual July general circulation model. Results show that the removal of Antarctic sea ice appears to weaken the polar vortex through heating the local atmosphere, and then to make the ultralong waves anomalous, especially to amplify the amplitude of the zonal wavenumber 3 in middle and high latitudes of the Southern Hemisphere. Anomalies of the Southern Hemispheric circulation intensify the east Asian monsoon and rainfall, which excite a wavetrain from the East Asia to the North America and cause anomalies of the Northern Hemispheric circulation .An interpretation of dynamical mechanism of the Antarctic sea ice climatic effect is also pro -posed .
出处
《大气科学》
CSCD
北大核心
1992年第1期69-76,共8页
Chinese Journal of Atmospheric Sciences
