【摘要】 对晚清《翁同龢日记》记载的1860-1898年北京沙尘天气资料进行比较系统的考证与评价,认为这份资料是真实可靠的,也是比较完整的(缺失率为8.8%)。经过整理,建立了1860-1898年北京年沙尘日数和春季(3-5月)沙尘日数序列。据此得到,1860-1898年北京年沙尘日数平均值为11 d左右,其中春季沙尘日数平均值为7 d左右,均低于1961-2000年相应的平均值。沙尘日数的月际分布为4月最高,8月最低,与1961-2000年基本一致。1860-1898年北京全年和春季沙尘日数与冬季(上年12月至当年2月)和春季降水量可能有较高的负相关关系。更多还原

【Abstract】 Some dust weather data of Beijing during 1860-1898 are recorded in the Diary of Tonghe Weng.The data are systematically examined and evaluated and proved to be reliable and relatively complete(with a loss rate of 8.8%) afterwards.The chronologies of annual and spring(Mar.-May) dusty days are established.The annual and spring dusty days in Beijing during 1860-1898 are accordingly showed to be about 11 and 7 days respectively,which are lower than those of 1961-2000.The monthly distribution of dusty days is similar to that of 1961-2000.April and August are the months with highest and lowest dusty days.High negative correlations possibly exist between the annual and spring dusty days and the winter(prior Dec.-current Feb.) and spring precipitations.更多还原