Northeast Cold Vortex Summer Anomaly And Its Impact On The Yangtze River Region Of The Rainy Season Precipitation

Persistent northeast cold vortex, often resulting in high-latitude cold air southward, the indirect effects of the low-latitude weather systems, precipitation in the rainy season have an impact on the Yangtze River region, but research in this area is still relatively small. In this paper, the Yangtze River region from1951to2000selected12representative stations in summer (5-9months) precipitation data,11stations in the Northeast summer surface temperature data, respectively, cold vortex stronger and weaker in summer temperatures in the Northeast region classified analysis, and cold vortex stronger and weaker in the Yangtze River region in precipitation were calculated its rainy season precipitation index value; application NCEP/NCAR reanalysis daily data, for2006a typical Northeast Cold Vortex storm Case analysis showed:Northeast Cold Vortex storm was caused by a strong cold vortex systems exist troposphere jet stream, the corresponding frontal ground presence, accompanied by low-level jet in the southwest side of the vortex. The northwest side of the subtropical high altitude air is heavy rains provide moisture, cold air vortex rear constantly replenished, making cold vortex maintain and retention, thus forming heavy precipitation; application1961-2009160stations in China monthly precipitation temperature data and NCEP/NCAR reanalysis data, analysis and synthesis using singular value decomposition of the Year Northeast Cold Vortex in Northeast summer abnormal height field analysis of the correlation between synthesis rainy season precipitation fields of the Yangtze River region and studied. The results show that:the northeast cold vortex intensity of summer and the rainy season precipitation fields of the Yangtze River were significantly positive correlation,500hPa height field synthesis analysis found:the rainy season rainfall over the Yangtze River in the year, the performance of height field over the same period in Northeast for more consistent negative anomalies, indicating stronger northeast cold vortex, low center east; rainy season rainfall year Yangtze River, northeast region height field over the same period showed a more consistent positive anomalies and negative anomalies north,indicating weak cold vortex,low center north. Rainy period in the relationship between the Northeast and the precipitation field500hPaheight field analysis between the Yangtze River region, select the first two singular vectors, and found that there was a significant negative correlation between the height field and precipitation fields, namely the northeast cold vortex strength synchronize changes with the Yangtze River precipitation fields; and conducted a correlation analysis between the precipitation fields Yangtze River in Northeast early rainy season and the rainy season500hPa height field, also selected for the first two singular vectors, have come to the forecast meaning the conclusion that the height of the rainy season games between the Northeast and the early rainy season precipitation fields Yangtze River region also there is a significant negative correlation, meaning that when the rainy early cold vortex strong intensity, corresponding rainy season precipitation in the Yangtze River large; the contrary, the corresponding small rainy season precipitation in the Yangtze River. Finally, the analysis results highly correlated field and precipitation fields applied singular value decomposition method derived herein for2009rainy season precipitation field application of the Yangtze River region highly synthetic field results over the same period and the Northeast were carried out pre-trial report, forecast the effect is better. In this paper, qualitative conclusions have important guiding significance for the quantitative study of the rainy season precipitation forecasts of the Yangtze River region.