东亚大槽

其原因在于，北极涛动在对流层低层和高层都可激发类似EU遥相关型的异常，通过影响西伯利亚高压和东亚大槽影响华北地区气温。

The reason may be that the AO can excite anomalies like the EU teleconnection pattern from low to high level in the troposphere which affect the Siberian High and East Asian Trough , thus influencing North China air temperature .

而准2a振荡（QBO）则主要与印度洋海洋-季风系统的低频振荡和东亚大槽的强度变化有关，并且都表现为最大滞后相关关系。

QBO is related to the variation of the Indian Ocean-monsoon system and the East Asian trough , which is always shown as a maximum lag correlation .

就亚太地区而言，在ELNino位相，东亚大槽减弱，热带西太平洋为反气旋性异常环流控制；东太平洋-北美地区PNA遥相关型发展。在LaNina位相情况相反。

As for the Asia-Pacific region , the East Asia is weaker , an anticyclone hovers over the West tropical Pacific , and the PNA teleconnection develops over East Pacific-North America in El Nino phase ; and opposite in La Nina phase .

东亚大槽和北美大槽1960年代中后期明显偏强及1980年代后期显著减弱，以及从1960年代开始西伯利亚高压的减弱和北太平洋涛动（NPO）的增大趋势。

Such as East Asian and North American troughs were apparent stronger in mid and late 1960 ′ s and remarkable weaker in late 1980 ′ s. From 1960 ′ s , Siberia High decreases trend and North Pacific oscillation ( NPO ) increases trend .

利用500hPa北半球格点资料，参照历史平均东亚大槽位置，定义了东亚冬季风强度指数（I500）。

Based on 500 hPa geopotential height fields and mean position of East Asian trough , a definition of the East Asian winter monsoon index ( I_ ( 500 )) is given .

结果表明，山东春季涝年与旱年的大气环流形势存在明显的差异，东亚大槽的异常减弱、乌拉尔地区高度场的明显降低是造成山东春季降水异常偏多的主要原因；

The result shows that there are marked differences in springtime atmospheric circulation between the flood and drought years .

华北冬季气温与蒙古冷高压异常、东亚大槽异常、极涡面积异常密切相关。

Winter air temperature in North China has important relationship with the Mongolia high anomaly , the East Asian trough anomaly and the acreage of polar vortex anomaly .

东亚大槽、乌拉尔山阻高、副热带高压位置及强度的变化对山东夏季降水有重要影响。

In the years of flood , the East Asia Trough , Ural Blocking High and Western North Pacific Subtropical High are very important systems influencing the summer precipitation .

涝年的前期冬季极涡向东扩展，东亚大槽和东亚冬季风较常年偏强；

Before the flood year , wintertime polar vortex expanded eastward , and the East Asia major deep trough and the East Asian winter monsoon were stronger than normal years .

其中西伯利亚高压、极涡的位置、东亚大槽的强弱、极锋急流都差异显著，从而导致大连地区冬季气温的异常。

Moreover , it is found that Siberia High , East Asian Trough , Polar Front Jet and the location of Polar Vortices are notable different , causing winter temperature anomalies in DaLian .

西太平洋副高强度与东亚大槽强度变化在30多年时间尺度也是基本同位相的，且副高变化超前约5～7年。

Subtropical high strength in the western Pacific region is mainly in phase to East Asian trough strength in the time scale of more than 30 years , and meanwhile the former leads the later about 5 - 7 years .

华北地区冬季气温偏低、偏高年的北半球环流形势存在明显的差异，亚洲区极涡面积、乌拉尔山东部高压脊、东亚大槽及蒙古高压是重要的影响因子；

There were differences in atmospheric general circulation patterns between cold and warm years , and polar vortex , with the high-pressure ridge around Ural Mountains , the East Asian trough , and the Mongolian high pressure being important influence factors ;

例如，极涡向北欧偏移，东亚、北美大槽和阿拉斯加脊的维持，都与地形有密切关系。

For example , the movement of the Arctic vortex to northeurope , the maintained troughs over East Asia and North america , and the maintained ridgeover Alaska are closely related to the relief .

东亚中纬度冬季盛行的1波流型在秋季异常发展，新疆脊偏强，东亚大槽加深西移。

The winter prevailing 1-wave flow pattern is abnormaly developed in autumn , Xinjiang ridge is intensified , East Asia trough is also intensified and moves westward .