ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
The Relations Between the Intertropical Convergence Zone(ITCZ) Skipping Northward and the Interaction BetweenTyphoon and Westerly Trough(TT) Pattern
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Abstract:
Using historical weather maps, typhoon year-books, and wind fields re-analyzed by ECMWF and NMC, the relations between the characters of some synoptic systems in summer, intertropical convergence zone (ITCZ) skipping northward and the interaction between typhoon and westerly though (TT) pattern are studied. The results are as follows. ① The Bohai sea high and the Japan sea high moving westward, quasi-permanent westerly though locating in the west of Hetao, and low-level southeasterly jet are beneficial to the interaction betwen typhoon and westerly though and the precipitation being caused by typhoon more than 400mm.② The ITCZ had skipped northward two times and reached to the most northern part of the whole year in July of three TT pattern years of "75.8","84.8", and "96.8". The first time of the ITCZ skipping northward was in the second pentad while the second time was in the forth or fifth pentad of July. The ITCZ had not skipped northward two times in other six non-TT pattern year.③ The southeast air current of the Australia cold high or the southeast air current of the southwest Pacific warms high affect the ITCZ of the northern hemisphere and skipping the northward. When the cross-equatorial southeast flow reaches to certain latitude of the northern hemisphere under a suitable circulation condition and then a sereis of cyclonic convergence zone will be generated due to the ITCZ northward skipping. The cross-equatorial flow not only causes the ITCZ northward skipping but can also convert the warm low of the ITCZ into typhoon.
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