Interdecadal Relationships between the Asian-Pacific Oscillation and Summer Climate Anomalies over Asia, North Pacific, and North America during a Recent 100 Years
Interdecadal Relationships between the Asian-Pacific Oscillation and Summer Climate Anomalies over Asia, North Pacific, and North America during a Recent 100 Years
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DOI：
10.1175/jcli-d-11-00054.1
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发表时间：
2011-09
影响因子：
4.9
通讯作者：
P. Zhao;Song Yang;Huijun Wang;Qiang Zhang
中科院分区：
文献类型：
--
作者：
P. Zhao;Song Yang;Huijun Wang;Qiang Zhang
摘要在年代际尺度上研究了夏季亚太涛动与亚洲、北太平洋和北美气候异常的关系。APO值在19世纪80年代至20世纪10年代中期较低，在20世纪20年代至40年代较高。当APO较高时，对流层温度在亚洲较高，在太平洋和北美较低。从低apo年到高apo年，对流层上层高压和对流层下层低压系统在南亚上空增强，在北美上空减弱。因此，反常的西南偏南气流在亚洲季风区盛行，这意味着亚洲上空的水汽输送更强。相反，北美上空对流层上层高压和对流层下层低压的减弱导致该地区的异常下沉运动。因此，亚洲季风区的降雨量普遍增加，而北美则减少。
AbstractSummertime relationships between the Asian–Pacific Oscillation (APO) and climate anomalies over Asia, the North Pacific, and North America are examined on an interdecadal time scale. The values of APO were low from the 1880s to the mid-1910s and high from the 1920s to the 1940s. When the APO was higher, tropospheric temperatures were higher over Asia and lower over the Pacific and North America. From the low-APO decades to the high-APO decades, both upper-tropospheric highs and lower-tropospheric low pressure systems strengthened over South Asia and weakened over North America. As a result, anomalous southerly–southwesterly flow prevailed over the Asian monsoon region, meaning stronger moisture transport over Asia. On the contrary, the weakened upper-tropospheric high and lower-tropospheric low over North America caused anomalous sinking motion over the region. As a result, rainfall generally enhanced over the Asian monsoon regions and decreased over North America.