Study on Atmospheric Water Vapor Content and Precipitation Efficiency at the Southern Foot of Taihang Mountain

The water vapor content of the weather system in the atmosphere has a great influence on precipitation. Research shows that the annual average water vapor content of the gas column from 500 to 1000 hPa from 2010 to 2017 at the southern foot of Taihang Mountain is between 4.52 and 4.65 g/cm², the difference between the peak and trough is 0.13 g/cm², and the average precipitation efficiency is 8.1%. Precipitation efficiency is related to precipitation size and weather system. When precipitation is 10–50 mm, precipitation efficiency increases with the increase of precipitation. Different types of weather systems, weather systems from southwest or southeast, have relatively high precipitation efficiency, while northern weather systems have relatively low precipitation efficiency.