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Statistical Study on Activity of Southwest Vortex and Relationship with Prepicitation

Author: ChenYan
Tutor: ZuoJinZhong
School: Nanjing University of Information Engineering
Course: Meteorology
Keywords: Southwest Vortex Toward Precipitation in the middle and lower reaches of the Yangtze River
CLC: P443
Type: Master's thesis
Year: 2007
Downloads: 145
Quote: 6
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Abstract


The Southwest Vortex is important storm weather systems . In this paper, the NCEP / NCAR reanalysis height field four times a day , the wind field , synoptic and statistical methods to try to determine the the Southwest Vortex quantitative statistical indicators , statistical analysis of 54 years of southwest vortex occurs when times The spatial and temporal distribution , etc. . Times from 1951 to 2004 , when the low vortex occurred statistical studies show that : the the the source vortex average annual statistical times a year by year changes showed significant interannual decadal law , and the overall downward trend , the 1965 Vortex when times by changing fewer mutations , times have the source appears more significant for four years , a period of about a decade . The Vortex the source significant monthly changes in the spatial distribution decreased sequentially from May to September . Times when the a moving vortex annual average statistics showed a significant upward trend in annual variation , with significant monthly variation . Vortex statistics times with precipitation in the middle and lower reaches of the Yangtze River and its surrounding decadal scale better vortex caused year-to-year changes in precipitation upward trend month by month , from May to September . Causing the precipitation is very similar to the vortex and the corresponding precipitation year-to-year changes in significant monthly variation . Taking into account the vortex development is divided into the northeast, east , southeast direction , based on the statistical analysis and on the the low eddy different path corresponding to the spatial and temporal distribution. Decade or so times the ratio of the vortex in the easterly direction and northeast anomaly showed decadal change cycle . The Vortex high side Year synthesis field show that the vortex dynamic conditions by the the southwesterly airstream prior to the trough of the eastern plateau and the Western Pacific subtropical high over the west side of the westerly flow under the guidance of the eastern mobile summer plenty of moisture sources vortex mobile development . Precipitation affect different regions corresponding to the different direction of development Vortex vortex easterly direction up , causing precipitation ratio , affecting the widest range , precipitation level is also the largest .

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CLC: > Astronomy,Earth Sciences > Atmospheric science (meteorology ) > Synoptic > Low pressure and extratropical cyclone
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