Abstract：Weng Xincun Diary conveys the most detailed weather records among all the known historical diaries，which provides valuable contemporary reports of dust weather in the middle of 19th century in Beijing.Firstly，this paper extracts every sand dust record scattered in this diary.By analyzing the sand dust records statistically，this paper reconstructs the sand dust weather condition in Beijing in the middle of 19th century.Whats more，the detailed dust records provide the possibility to recognize the subdivision of the sand dust weather in historical time，the sandstorm，sand blowing and the floating dust weather.As the present research has no official classification methods to classify the dust weather from historical records，this paper explores a way to classify the different types of sand dust weather.The results show that: (1)the annual average sand dust days of Beijing at that time is up to 31.36 times，which is higher than the annual average sand dust days during the last 60 years.(2)The classification of different types of sand dust weather shows that the composition of sandstorm，sand blowing and floating dust weather is similar to that of today，the inner annual distribution of sand weather days in the middle of 19th century also shares similarity to today's data.(3)The main difference lies in the season distribution of sand weather: In the 1850s，the sand weather occurrence in summer is higher than today by 46％，the sand weather occurrence in winter however，is lower by 15％ compared with the present status.This result may show that the seasonally distribution of sand dust weather changes greatly from ancient time.(4)The interannual variability of sand weather is quite obvious in the 1850s，and this paper shows that the local precipitation acts as an important role in the annual variability of sand dust weather.
Yang Yuda,Cheng Sainan,Man Zhimin. High-resolved sand dust records of Beijing in the middle of 19th century：A preliminary study of Weng Xincun Diary[J]. JOPC, 2013, 15(4): 565-574.
