The Spatio-temporal Evolution Of Wintertime North Pacific Storm Track And Its Relationship With Arctic Oscillation

With the NCAR/NCEP reanalysis data, we studied the horizontal and vertical distributing of north hemisphere storm track and the relationship between the Arctic Oscillation and north pacific storm track..Therefrom conclusions are drawn as follow:(1) The north hemisphere storm track are belts full predominantly of strong synoptic eddy activities.In this area, use different physical quantities reflects the physical characterisitics of the storm track. Obvious differences appear in different regions of storm track to same physical quantity. That illustrate the structure of storm track.(2) In winter, the north pacific storm track experience significant annual and decadal variability. Generally , when the intensity turn strong(weak), the area extend(shrink) with the center westward(eastward) and southward(northward) migration. The annual variability exhibits two major patterns, i.e., a monopole with the north pacific storm track showing their changing strength and position in the vicinity of their long-tenn mean locations and a dipole of their intensity change and northward or southward migration over their eastern parts.(3) With the composite analysis, we studied the relationship of north pacific storm track and Arctic Oscillation. In the year storm track trun strong (weak), AO also have the same change along it. On the other hand, in the year of AO index high (low), NPSTs exhibits noticeable differences in horizontal and vertical direction and its energy disturbing.