Analysis of the March 2015 Atmospheric Circulation and Weather
The following are the main characteristics of the general circulation of atmosphere in March 2015. There are two polar vortex centers in the Northern Hemisphere located more southward than normal years. The circulation presents latitudinal patterns in middlehigh latitudes. The average south branch trough is located near 70°E. Besides, the subtropical high is much more stronger than normal years, and located more westward than normal years. The monthly mean precipitation is 21.8 mm, which is 26.1% less than normal (29.5mm). The monthly mean temperature is 5.8℃, which is 1.7℃ higher than normal (4.1℃). There are five cold air processes and five rainfall processes in the month. Meanwhile, fog and haze weather appears in the central and eastern part of China. Moreover, five sanddust processes occur in northern part of China.