This work was funded by the Israeli Science Foundation Grants 1370/08 and 1537/12 and by the Bi-National Science Foundation Grant 2008436. OL also thanks the Israeli Ministry of Science and Technology for a woman scientists’ scholarship. The authors wish to thank Ori Adam for providing useful numerical tools and advice and Ted Shepherd and Eyal Heifetz for their helpful comments in the early stages of this work. Thanks also to two anonymous reviewers for their useful recommendations.
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In the Northern Hemisphere winter, different flow regimes may be identified by zonally averaging over certain longitudinal sectors (Eichelberger and Hartmann 2007). A classification of these regimes according to the categorization suggested in this paper will be discussed in a separate paper, but it should be mentioned that when looking at the location of the maximum zonal wind relative to the latitudes of ascent and decent, it seems that above the Pacific Ocean the jet is located inside the Ferrel cell, similar to the merged jet regime, while above Asia, it is closer to the edge of the Hadley cell, similar to the subtropical jet regime. However, comparing the dominant modes raises the possibility that the regime above the North Pacific is close to the subtropical jet regime, since westward-propagating long waves in high latitudes were observed there by Kushnir (1987), similar to what we find in the subtropical jet regime in our model.