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A NORTHERN HEMISPHERE ANNULAR MODE AS THE COMBINATION OF THE NAO AND THE PNA |
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| Authors: | ZHAO Nan WANG Ya-fei and SHEN Xin-yong |
| Institution: | 1. LaSW, Chinese Academy of Meteorological Sciences, Beijing, 100081 China;Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science and Technology, Na 2. LaSW, Chinese Academy of Meteorological Sciences, Beijing, 100081 China 3. Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science and Technology, Nanjing 210044 China;Department of Atmospheric and Oceanic Science, Univer |
| Abstract: | This paper demonstrates that an annular mode can be constructed from the combination of the North Atlantic Oscillation(NAO) and the Pacific/North American(PNA) patterns.The quasi-annularity,meridional dipole and vertical barotropy of the constructed annular mode resemble those of the Atlantic Oscillation(AO) pattern.It is also a dominant mode in terms of the variance contribution.Moreover,its temporal correlation with the AO is quite strong.This new annular mode has the advantage over the AO in that it inco... |
| Keywords: | annular mode NAO-PNA perspective AO |
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