摘要
采用最大熵谱方法分析了１９５３～１９９０年间冬季喀拉海、巴伦支海海冰面积指数、西伯利亚高压强度指数、东亚冬季风强度指数的变化周期，并把冬季喀拉海、巴伦支海海冰面积变化与春夏各季节副热带高压的特征量指数（包括面积指数、强度指数）变化进行了比较。研究发现在海冰－大气气候系统中，明显存在１０年尺度周期性变化；冬季喀拉海、巴伦支海海冰面积变化与西伯利亚高压强度指数、东亚冬季风强度指数均呈现相反的变化趋势，海冰偏多（少）则西伯利亚高压偏弱（强）、东亚冬季风也偏弱（强）；冬季海冰面积变化与春夏各季节副热带高压的范围、强度均呈现相同的变化趋势，并且海冰变化要超前０～１年；复经验正交分析表明大气１０年尺度周期性变化的振荡源分布均与某一海区（洋区）有关，大气１０年尺度变化是对海洋（海冰）变化的响应。
By using maximum entropy and band-pass filter methods, the variation periods of sea ice area index in the Kara/Barents Seas, the intensity index of the Siberia High and winter monsoon over East Asia during winter of 1953～1990 were analyzed And the sea ice area variation in winter in the Kara/Barents Seas was compared with the area and intensity indices of the subtropical high in the following spring and summer These analyses show that there is an obvious decadal variation in the sea-ice-air system in the Northern Hemisphere, that the variations of intensity index of winter Siberia High and winter monsoon over East Asia are out of phase with that of sea ice area in winter in the Kara/Barents Seas And the more (less) sea ice is, the weaker (stronger) winter Siberia High and winter monsoon are The variation trend of sea ice area is similar to that of the area and the intensity of the subtropical high in the coming spring and summer, and with a lag period of 0～1 year for the later The decadal oscillation sources in the atmosphere are closely linked to some sea regions The centre of the strongest oscillation source excited by winter sea ice in the Kara/Barents Seas is at near 70°E, 60°N
出处
《大气科学》
CSCD
北大核心
1998年第2期137-144,共8页
Chinese Journal of Atmospheric Sciences
