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- W2103302309 abstract "In this paper, the role of eddy feedback in the formation and excitation of the NAO (North Atlantic Oscillation) is examined in a linear barotropic model with an empirical closure for synoptic eddy and low-frequency flow (SELF) feedback. The EOF-space based model captures the linear dynamics of the barotropic model linearized with respect to climatological mean flow very accurately with relative low-order truncations. The parameterized empirical linear low-dimension SELF-feedback operator also depicts the relation between eddy-induced streamfunction tendencies and the large-scale circulation to a reasonable degree. Singular vector analysis (SVD) is performed on the linear low-dimension dynamic operator with SELF-feedback to exam the leading low-frequency mode of the system. It is shown that the leading SVD mode (the left vector) of the linear low-dimension dynamic operator with smallest SVD value resembles the observed NAO pattern. The role of eddy feedback in the excitation and maintenance of NAO is then further examined by relating the effective external forcing patterns to the right vector of the leading SVD mode of the linear dynamic operator. It is shown that local dipolar external forcing at middle latitudes over North Atlantic is effective in exciting the NAO-like anomaly pattern, whereas the effectiveness of the external forcing over different areas sensitively depends on the eddy feedback." @default.
- W2103302309 created "2016-06-24" @default.
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- W2103302309 date "2013-08-02" @default.
- W2103302309 modified "2023-10-13" @default.
- W2103302309 title "The role of eddy feedback in the excitation of the NAO" @default.
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- W2103302309 doi "https://doi.org/10.1002/met.1415" @default.
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