Dynamic Mechanism of Interannual Sea Surface Height Variability in the North Pacific Subtropical Gyre |
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Authors: | ZHANG Yong-Chui ZHANG Li-Feng and LU Qing-Ping |
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Institution: | Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101, Physical Oceanography Laboratory, Ocean University of China, Qingdao 266003,Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101,Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101 |
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Abstract: | In this study, the dynamic mechanisms of interannual sea surface height
(SSH) variability are investigated based on the first-mode baroclinic Rossby
wave model, with a focus on the effects of different levels of wind stress
curl (WSC). Maximum covariance analysis (MCA) of WSC and SSH anomalies
displays a mode with significant WSC anomalies located primarily in the
mid-latitude eastern North Pacific and central tropical Pacific with
corresponding SSH anomalies located to the west. This leading mode can be
attributed to Ekman pumping induced by local wind stress and the
westward-propagating Rossby wave driven by large-scale wind stress. It is
further found that in the middle latitudes, the SSH anomalies are largely
determined by WSC variations associated with the North Pacific Gyre
Oscillation (NPGO), rather than the Pacific Decadal Oscillation (PDO). The
sensitivity of the predictive skill of the linear first-mode baroclinic
model to different wind products is also examined. |
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Keywords: | baroclinic Rossby wave model Pacific Decadal Oscillation North Pacific Gyre Oscillation |
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