The meridional mode of global tropospheric–stratospheric circulation |
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| Authors: | Xiao-Bo Yang Zhen-Feng Ma Ding-Yi Wang Hua-Sheng Yan |
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| Institution: | 1. Chengdu Institute of Plateau Meteorology, China Meteorological Administration, Chengdu, China;2. Climate Center of Sichuan Province, No. 20 Guanghuacunjie, Chengdu 610071, China;3. Physics Department, University of New Brunswick, Fredericton, New Brunswick, Canada;4. Physics Department, Qujing Normal University, Qujing, Yunnan, China;5. Department of Atmospheric Science, Yunnan University, Kunming, China;1. National Institute for Space Research (INPE), São José dos Campos, SP, Brazil;2. Los Andes University, Mérida, Venezuela;3. National Space Science Center, Chinese Academy of Science, Beijing, China;4. Southern Regional Space Research Center (CRS/INPE), Santa Maria, RS, Brazil;1. Geomagnetic Laboratory, Natural Resources Canada, Ottawa, ON, Canada;2. Physics Department, University of New Brunswick, Fredericton, NB, Canada;3. Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA;4. Department of Earth and Planetary Sciences, Kyushu University, Fukuoka, Japan;5. National College of Technology, Kumamoto College, Yatsushiro, Japan;6. Emeritus, Communications Research Centre, Ottawa, ON, Canada;7. Astronomical Institute, Slovak Academy of Sciences, Tatranská Lomnica, Slovak Republic;8. Slovak Central Observatory, Hurbanovo, Slovak Republic;9. Slovak Hydrometeorological Institute, Bratislava, Slovak Republic;1. Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2. Laboratory for Ocean and Climate Dynamics, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China;3. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | The spatio–temporal variations of major meridional modes are studied by using the ECMWF and NCEP/NCAR reanalyzed geopotential data between 70 and 10 hPa during 1979 and 2001. The variance contribution rates from the first and second modes are 56–69% and 14–22%, respectively, for ECMWF, but 76–85% and 9–10% for NCEP/NCAR. The climatic trend coefficients are positive and negative in the troposphere and stratosphere, respectively. The reversal is remarkably correlated with the AO/NAM, AAO/SAM and polar vortex, suggesting their important role in connecting the mid-low and upper circulation and the interaction between SH and NH. |
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