Climatic Characteristics of Disastrous Weather in the Hunshandake Sandy Land

In order to explore the characteristics of climate change in the Hunshandake Sandy Land,the number of gale days,sandstorms,and extreme precipitation events in the sandy land from 1956 to 2018 were analyzed.The results show that in the Hunshandake Sandy Land,the number of gale days was the largest in spring;it first increased and then decreased from 1956 to 2018.The number of gale days was large from 1955 to 1980,and decreased in fluctuation after 1980.Sandstorms mainly occurred in spring;the number of sandstorm days first increased and then decreased.It was the largest during 1966-1970,and then decreased slowly;it was the smallest during 1996-2000.with the anomaly of about-0.16 d;it rose after the 21 stcentury.The threshold of extreme precipitation in the sandy land was high in the south and low in the north.The threshold exceeded 80 mm in the southern part of the sandy land,and was less than 50 mm in sandy hinterland and its northern part.The total frequency of extreme precipitation in the sandy land showed an increasing trend year by year.Especially after 1982,the frequency of extreme precipitation rose obviously.Extreme precipitation events mostly happened in July and August.The frequency of extreme precipitation events was the highest in Abaga Banner and the lowest in Duolun County.The maximum daily precipitation appeared in Duolun County,reaching 142.3 mm.