陕西关中及周边地区近500a来初夏旱涝事件初步分析
投稿时间:2006-01-03  修订日期:2006-04-06  点此下载全文
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作者单位
尹红 南京信息工程大学, 大气科学学院, 江苏, 南京, 210044
中国气象局, 气候研究开放实验室, 北京, 100081 
郭品文 南京信息工程大学, 大气科学学院, 江苏, 南京, 210044 
刘洪滨 中国气象局, 气候研究开放实验室, 北京, 100081 
邵雪梅 中国科学院, 地理科学与资源研究所, 北京, 100101 
HansLinderholm 哥森堡大学, 地球科学系, 瑞典, 哥森堡, SE-40530 
基金项目:国家“十五”科技攻关项目(2001BA611B-01);中意环保合作项目(SWIMER-TASK8)
中文摘要:基于华山树轮宽度差值年表重建的陕西关中及周边地区近500 a来的初夏干燥指数序列,对该地区初夏极端旱涝事件及其连续旱涝变化特征进行了初步分析。区域干燥指数与Palmer指数在变化上极为相似,可用于反映该地区的旱涝变化。结果表明:该地区近500a来初夏共发生18次极端干旱事件和11次极端洪涝事件,除公元1521年与历史文献记录的旱涝事件相反,公元1513年、1574年、1675年和1945年未发现历史记录外,其余年份均能找到相应记录;近500a来初夏存在9个显著的连续偏旱期和10个显著的连续偏涝期,并以16和19世纪发生的连续旱涝事件最为频繁,而17和18世纪发生的旱涝事件相对较少,20世纪发生的干旱事件明显多于洪涝事件。
中文关键词:气候变化  旱涝事件  干燥指数  关中地区
 
Preliminary Analysis of Drought/Flood Events in Early-Summer over the Central Shaanxi Plain during the Past 500 Years
Abstract:In this study,the variation characteristics of extreme drought and flood events during the past 500 years were analyzed using the early-summer dryness indices series reconstructed by tree ring width chronologies of Huashan Pine sampled at the Huashan Mountain.Comparisons between the dryness indices and the Palmer indices show that the dryness indices could be used to figure out the drought and flood events in the central Shaanxi plain.There were 18 extreme droughts and 11 extreme floods events in early-summer detected in this area during the past 500 years.Most of the events could be found in the historical documents,except that a flood event was detected from the dryness index but a drought event was recorded in the historical documents in A.D.1521.There are also four events which have no corresponding records in the historical documents in A.D.1513,1574,1675 and 1945,respectively.Nine continuous drought periods and ten continuous flood periods are significant in the past 500 years.The drought and flood events occurred with high frequency in the sixteenth and the nineteenth centuries,but were less in the seventeenth and eighteenth centuries.The drought events are obvious more than the flood events in the twentieth century.
keywords:climate change  drought and flood events  dryness indices  central Shaanxi plain
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