ABSTRACT
Drought is a slow-onset natural disaster. As the main grain-producing area in China, North China has droughts of varying degrees almost every year, which brings serious hidden dangers to China's grain production. Based on the daily and monthly precipitation datasets of China's surface climate data from 1998 to 2017, and using the standardized precipitation index (SPI) events and specific drought events, this paper analyzed the temporal and spatial variation characteristics of drought in North China in the past 20 years from the annual and monthly time series changes of SPI and spatial scale evolution of seasonal drought. The results show that (1) droughts in North China are frequent and increasing year by year; (2) the drought degree in North China changes obviously with seasons, mainly in spring, summer and autumn, and the drought frequency is higher in spring and summer; (3) The spring drought in some areas of Shanxi is serious, the summer drought in North China is severe, the autumn drought in Inner Mongolia is heavy, and the winter drought in North China hardly occurs.
