【摘要】 用1948—2000年的北半球海平面气压场月平均资料,计算了北太平洋涛动指数和东亚冬季风指数,并研究了北太平洋涛动与东亚冬季风及我国冬季天气气候的关系。研究表明,北太平洋涛动异常变化与我国冬季天气、气候关系密切。强涛动年,东亚冬季风偏弱,我国气温普遍偏高,长江中下游地区降水偏少,而华南降水偏多;而弱涛动指数年,东亚冬季风偏强,我国气温普遍偏低,降水偏少。此外,还指出,强(弱)INPO年大气环流具有弱(强)WP型和强(弱)EU遥相关型。更多还原

【Abstract】 By use of 1948—2000 monthly Northern Hemispheric sea level pressure data,the North Pacific oscillation index(I_NPO) and East Asian winter monsoon index(I_EAWM) are calculated.Results show that the winter I_NPO anomaly bears a close relation to the weather/climate of winter over the mainland of China.When a strong I_NPO occurs,the EAWM will become weaker,and China will experience an extensive high temperature,less rainfall in the middle-lower reach of the Yangtze River;and higher temperature and more rainfall in South China in winter.While a weak I_NPO occurs,EAWM will become stronger,and China will experience an extensive lower temperature and less rainfall in winter.It is also found that when the North Pacific oscillation is strong,the atmospheric circulation shows the weak WP pattern and strong EU teleconnection pattern,and vice versa.更多还原