Multi-Time-Scale Climatic Variations over Eastern China and Implications for the South–North Water Diversion Project

• DOI: 10.1175/2011jhm1321.1
• Publication Date: 2011-02-22T22:10:26Z
• Authors: Guoyu Ren; Hongbin Liu; Ziying Chu; Li Zhang; Xiang Li; Weijing Li; Yu Chen; Ge Gao; Yan Zhang
• Keywords: Pan evaporation; Trend analysis; Mean radiant temperature

Abstract Middle and eastern routes of the South–North Water Diversion Project (SNWDP) China, which are approximately located within area 28°–42°N 110°–122°E, being constructed. This paper investigates past climatic variations on various time scales using instrumental proxy data. It is found that annual mean surface air temperature has increased significantly during 50–100 years, winter spring temperatures in northern part region have undergone most significant changes. A much more increase occurs for minimum extreme low than maximum high temperature. No trend precipitation as a whole last 50 100 although obvious decadal spatial variation detectable. seesaw pattern summer variability between north south evident. Over Haihe River basin witnessed negative precipitation, but no similar detected Yangtze Huaihe basins. Pan evaporation decreased since mid-1960s spite fact appears to ended early 1990s. The pan very plain Yellow Rivers. There was notable series dry intervals lasting decades region. drought 30 years not severe view 500 years; however, southern period from 1960s 1980s may been unprecedented. dryness–wetness index (DWI) shows oscillations with periodicities 9.5 20 10.5 25 north. Longer DWI include 160–170- 70–80-yr north, 100–150-yr south. observed climate change could implications construction management SNWDP. official approval start hydro project catalyzed by multiyear 1997–2003 operation future will also be influenced change—in particular variability. provides preliminary discussion potential