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Variation in summer surface air temperature over Northeast Asia and its associated circulation anomalies |
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| Authors: | Wei Chen Xiaowei Hong Riyu Lu Aifen Jin Shizhu Jin Jae-Cheol Nam Jin-Ho Shin Tae-Young Goo Baek-Jo Kim |
| Institution: | 1. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China 2. University of Chinese Academy of Sciences, Beijing, 100049, China 3. Department of Geography, Yanbian University, Yanji, 133002, China 4. National Institute of Meteorological Research, Korea Meteorological Administration, Jeju, Korea |
| Abstract: | This study investigates the interannual variation of summer surface air temperature over Northeast Asia(NEA) and its associated circulation anomalies.Two leading modes for the temperature variability over NEA are obtained by EOF analysis.The first EOF mode is characterized by a homogeneous temperature anomaly over NEA and therefore is called the NEA mode.This anomaly extends from southeast of Lake Baikal to Japan,with a central area in Northeast China.The second EOF mode is characterized by a seesaw pattern,showing a contrasting distribution between East Asia(specifically including the Changbai Mountains in Northeast China,Korea,and Japan) and north of this region.This mode is named the East Asia(EA) mode.Both modes contribute equivalently to the temperature variability in EA.The two leading modes are associated with different circulation anomalies.A warm NEA mode is associated with a positive geopotential height anomaly over NEA and thus a weakened upper-tropospheric westerly jet.On the other hand,a warm EA mode is related to a positive height anomaly over EA and a northward displaced jet.In addition,the NEA mode tends to be related to the Eurasian teleconnection pattern,while the EA mode is associated with the East Asia-Pacific/PacificJapan pattern. |
| Keywords: | surface air temperature Northeast Asia East Asia circulation anomaly interannual variability |
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