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Can Eddy Forcing be Responsible for the Spatial Structure of the Northern Hemisphere Annular Mode? |
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| Authors: | ZHAO Nan LI Yan SHEN Xinyong State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences Beijing China Key Laboratory of Meteorological Disaster of Ministry of Education Nanjing University of Information Science & Technology Nanjing China |
| Institution: | ZHAO Nan 1,2,LI Yan 1,and SHEN Xinyong 2,3 1 State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences,Beijing 100081,China 2 Key Laboratory of Meteorological Disaster of Ministry of Education,Nanjing University of Information Science & Technology,Nanjing 210044,China 3 Department of Atmospheric and Oceanic Science,University of Maryland,College Park,Maryland 20742,USA |
| Abstract: | In order to study the origin of the spatial structure of the Northern Hemisphere Annular Mode (NAM),a linear stochastic model is constructed empirically from the output of a GCM run.Optimal stochastic forcing in terms of the maximum variance contribution,which may be potentially related to the maintenance of the NAM,is investigated.Theoretical analysis on the dominant non-modal response to the stochastic forcing shows that this dominance is jointly decided by the properties of forcing and the non-modal grow... |
| Keywords: | AO/NAM eddy forcing spatial structure non-modal growth |
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