The linkage between the Pacific-North American teleconnection pattern and the North Atlantic Oscillation |
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| Authors: | Jie Song Chongyin Li Wen Zhou Jing Pan |
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| Institution: | State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG),
Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences, Beijing 100029; Graduate University of Chinese Academy of Sciences, Beijing 100;State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG}),
Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences, Beijing 100029;State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG),
Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences, Beijing 100029;
CityU-IAP Laboratory for Atmospheric Sciences, Department of;State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG}),
Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | In this study, using the ECMWF reanalysis data, the possible linkage between the Pacific-North
American teleconnection pattern (PNA) and the North Atlantic Oscillation (NAO) during boreal winter
(December--February) is investigated. The PNA and the NAO pattern are obtained by performing Rotated
Empirical Orthogonal Function (REOF) analysis on an anomalous daily mean 300-hPa geopotential height
field. The composite daily NAO indices show that the NAO indices are prone to be negative (positive)
when the contemporary PNA indices are extremely positive (negative). The correlation coefficients
between the daily PNA and NAO indices also confirm that, indeed, there is a significant anti-correlation
between the PNA and NAO indices. The correlation peaks at a lag of 0 days (meaning contemporary correlation),
and its value is 0.202. Analyses of a newly defined Rossby wave breaking index and diagnostics of the
stream function tendency equation indicate that the anti-correlation between PNA and NAO may be caused
by the anomalous Rossby wave breaking events associated with the PNA pattern. |
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| Keywords: | Pacific-North American teleconnection pattern (PNA) North Atlantic Oscillation (NAO) wave breaking |
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