Abstract
Influence of the subarctic front zone (SAFZ) intensity variation on the midwinter suppression of the North Pacific storm track (NPST) is investigated based on reanalysis datasets in centennial period. It is found that when the late-autumn SAFZ intensity is stronger, the midwinter suppression of the NPST is more pronounced. Lagged regression analysis shows that there exist distinct subseasonal changes in the NPST response to the late-autumn SAFZ intensity variation, with significantly intensified NPST in late autumn but weakened NPST in midwinter. The difference in the NPST response between November and January is presumed to be responsible for the larger suppression of the NPST in midwinter. Analysis on the local energetics reveals that changes in the baroclinic energy conversion (BCEC) associated with the late-autumn SAFZ intensity variation are similar to the NPST response pattern, indicating that the BCEC plays a crucial role in determining the distinct subseasonality in the NPST response.
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