Analysis of the March 2014 Atmospheric Circulation and Weather
The characteristics of general circulation of atmosphere in March 2014 are following. The polar vortex in the Northern Hemisphere is eccentric type with the main body located in the northern part of North America and there are two other vortex centers positioned near Novaya Zemlya and Okhotsk Sea respectively. Compared to the normal mean condition, the former one is stronger about -10 dagpm in the geopotential height anomaly and the later one is nearly neutral lying further south. The Asia ridge is stronger about 6 dagpm in geopotential height anomaly and its area is larger, because of which the mean temperature of March is 1.2℃ higher than the normal temperature 4.1℃, recorded as the 6th highest since 1961. The position and strength of East Asia trough, south branch, and subtropical high of the Northwest Pacific all are neutral compared to the normal conditions. The mean precipitation in March is 29.1 mm, approaching to the normal average 29.5 mm. In March, there are more cloudy and rainy days in the south of China, but dust weather in the north, fog and haze processes in the central and eastern part, and severe convective weathers in many provinces.