Study on Frost and Snow Disasters and Climatic Events during Qing Dynasty in the North of Qinling Mountains in Shaanxi Province
Using disaster level method,mathematical statistics method,wavelet analysis method to study the frost and snow disaster level,spatiotemporal distribution,periodicity,and disaster causing factors in the North of Qinling Mountains in Shaanxi Province during the Qing Dynasty.The results show that:(1)A total of 97 frost and snow disasters occurred in the North of Qinling Mountains in Shaanxi Province during the 268 years of the Qing Dy-nasty,with 1644-1703 and 1864-1911 being the high-frequency periods,1704-1783 and 1784-1863 being the relatively low-frequency periods,and there were quasi cycles of 3 a,7 a,11 a and 28 a.(2)The frequency and lev-el of frost and snow disasters have seasonal characteristics.Frost disasters are most frequent in spring and autumn,snow disasters occur most frequently in winter and spring,and frost disasters are almost exclusively in winter.Moder-ate level disasters often occur in spring and autumn,while severe level disasters often occur during autumn and win-ter.(3)The strength and frequency of frost and snow disasters have good spatial consistency,mainly concentrated in the northwest of the Loess Plateau in northern Shaanxi and the southeast of the Guanzhong Basin.(4)The high-fre-quency period of frost and snow disasters corresponds to a colder and drier climate.The intensity of winter winds is the direct factor determining the occurrence of frost and snow disasters.(5)The most prominent feature of the Little Ice Age climate in the Qing Dynasty was the catastrophic cooling event that occurred in warmer or hotter months,with temperatures dropping by about 15～20℃,leading to catastrophic weather processes.(6)During the Qing Dynasty,two extreme cold weather events occurred in the north of Qinling Mountains in Shaanxi Province,between 1662-1692 and 1861-1900,respectively.The latter indicated the period of the lowest temperature in the Qing Dynasty.
Qing Dynastyfrost and snow disasterspatial-temporal changecold climate eventsNorth of Qinling Mountains in Shaanxi Province
NETL
NSTL
万方数据
