Interannual variation of the Asian-Pacific oscillation |
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| Institution: | 1. Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/Joint International Research Laboratory of Climate and Environmental Change (ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science and Technology, Nanjing, China;2. International Pacific Research Center, and School of Ocean and Earth Science and Technology, University of Hawaii, 2525 Correa Rd., Honolulu, HI 96822, USA;1. Russian State Hydrometeorological University, Maloohtinsky 98, St. Petersburg 195196, Russia;2. St. Petersburg State University, ul. Ulyanovskaya 1, St. Petersburg 198504, Russia;3. Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100080, China;1. Norwegian University of Science and Technology (NTNU), Trondheim, Norway;2. Birkeland Centre for Space Science, Bergen, Norway;1. Radio and Atmospheric Physics Lab., Rajdhani College, University of Delhi, India;2. Department of Physics and Astrophysics, University of Delhi, India;3. Space Physics Laboratory, VSSC, Trivanduram, India;4. COSMIC Program Office, University Corporation for Atmospheric Research, Boulder, CO, USA;5. Department of Geophysics, Kyoto University, Kyoto, Japan;6. Department of Physics, Yogi Vemana University, Kadapa, AP, India |
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| Abstract: | Previous studies have identified an Asian-Pacific Oscillation (APO) teleconnection pattern, which exhibits an out-of-phase relationship in the summer tropospheric temperature with warming over the Eurasia and cooling over the Northern Pacific and the Northern America, and vice versa. But the interannual variation of this teleconnection remains obscure. This study points out that interannual variation of the APO teleconnection is associated with the second empirical orthogonal function (EOF) mode of the northern-hemisphere upper tropospheric temperature during boreal summer, which accounts for 14% of the variance. A heat budget analysis is conducted for the Eurasian region and the North Pacific region respectively to reveal the cause of the zonal dipole mode temperature structure. For the Eurasia region, the warming is contributed by the adiabatic heating process due to downward vertical motion anomalies. For the Northern Pacific region, the temperature variation is mainly contributed by zonal advection associated with interannual zonal wind perturbation acting on the climatological temperature gradient. Composite analysis and numerical experiments with an atmospheric general circulation model (AGCM) shows the interannual zonal wind perturbation is related to the sea surface temperature anomalies over the equatorial eastern Pacific. |
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| Keywords: | Atmospheric teleconnection Eurasia-Pacific Boreal summer Atmospheric temperature |
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