摘要
根据清代万锦滩水位志桩的伏秋汛期(5-10月)涨水水位记录,建立了1766-1911年黄河三门峡断面径流量(m^3)序列,再根据三门峡断面径流量与黄河上中游10站点面积加权降雨量关系,重建了1766-1911年黄河上中游5-10月降雨量(mm)序列。该序列显示出19世纪中期之后研究区伏秋汛期降雨持续减少,进入20世纪后有所回升。降雨量波动与根据江淮梅雨长度、SLP记录等资料反映的夏季风强度变化基本对应;小波分析则显示本区伏秋汛期降雨量存在明显的50 a周期;在多年际尺度上与指征ENSO强度的UEP指数具有较明显的反相位关系,El-Nino年降雨量放大,La-Nina年则降雨量减小。
Qing government set a water gauge station in Wanjintan, Henan Province in 1766, which is used to read the water levels during the flood season (May to October) of the Yellow River (the source- Sanmenxia reach). Based on the records of water level 1766-1911, the natural annual runoffs of the Yellow River (Sanmenxia) have been reconstructed. Rainfall is the most important resource of runoffs. In this paper, the precipitation (May-October) of 10 stations along the upper and middle reaches of the Yellow River decreased since 1850s, summer monsoon strength and subtropical high pressure position lead to precipitation changing, and the wavelet analysis show there is 50 a cycle in the precipitation changing. The precipitation and UEP is anti-related on the years scale.
出处
《地球环境学报》
2011年第1期285-290,共6页
Journal of Earth Environment
基金
国家重点基础研究发展规划(973计划)项目(2010CB950100)
中国博士后科学基金项目(20090461280)
陕西师范大学人文社会科学基金项目(09SYB06)
关键词
黄河上中游
降雨量
汛期
清代
the upper & middle reaches of the Yellow River
precipitation
flood season
Qing Dynasty