To analyze the seasonal regulations of the ITCZ, here just put on the map of 850mb ink, the map has most visibly active ITCZ. In addition, the results of the study also indicated that, during the period from December of the previous year to March the following year, on the Western North Pacific ITCZ, operated mainly in the southern hemisphere and almost does not affect the forecast Vietnam should just analyze the ITCZ in the period from April to November. Results analysis of the map shows:In April (Figure 3.1), in the equatorial region of the double ITCZ exist, Xinfeng from two hemispheres both reach and penetrate the equatorial region, we are still in the world almost balance: Xinfeng northern hemisphere yet retreat permanently but Xinfeng Southern Hemisphere not pass up North. This situation reflects this is, the transition from winter to summer in the northern hemisphere.
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