摘要
本文根据我国历史文献中的沙尘记载，讨论历年记录地点的南部边界的变动，指出南界地带的大致分布及其随北方地区的干湿气候条件而南北变动的特点。通过历史气候记录和现代气象观测资料的分析认为，南界地带的沙尘天气记录对北方尘源地区干湿气候状况有指示意义。文中根据南界地带的历史降尘记录对北方地区相应年份气候干湿状况试作推断，从而为北方干旱区气候历史的研究提供参考。
Analysis on the historical dust fall documents of China, indicating that the southern limits of sand-dust weather records are roughly along the mid-low reaches of the Changjiang River with occassionally 1% extended to 25.5°N, and the southern most limit to 23.5°N. Based on the comparison between the annual dryness / wetness grades over each 30-year interval in the last 500 years for possible source regions including of Inner Mongolia, Gansu and Mngxia and the southern limit of dust fall records indicating that during dry periods of northern China (e.g. 1621~ 1650) the southern limit extended to Wenzhou and Yichun, roughly got to 28°N, however, during the wet period (e.g.1881~1910), dust events reduced and the southern boundaries retreated to the Changjiang River and even farther northward. Similar results are obtained from 10-year interval statistics. Based on the data from 1951 to 2000, a good correlationship is got between the number of days with floating, raising dust and sandstorm at Naming and Hangzhou, and the regional mean precipitation and dryness / wetness grades in the inner Mongolia, especially for the winter-spring season. It follows that the historical sand-dust records in South China may be used to infer the dry and wet climate in the arid regions of northern China. By using the description of 260 dust fall records during the 12~14th centuries of Nanjing and hangzhou,we divided them into sandstorm, raising sand or floating dust events and thus inferred the climatic conditions in the inner Mongolia during 37 yearly case studies. And based on the dust fall records in the southern marginal zones of 15~19th centuries, we estimate the dry / wet grades in the inner Mongolic which are missed in the historical records.
出处
《第四纪研究》
CAS
CSCD
北大核心
2001年第1期1-8,共8页
Quaternary Sciences
基金
中国科学院创新重大方向项目!(批准号:KZCX2-305)
关键词
沙尘暴
历史降尘记录
历史气候
干旱气候史
北方
中国
sandstorm, historical dust fall records, historical climate, the history of drought climate
