JOURNAL OF NATURAL RESOURCES ›› 2006, Vol. 21 ›› Issue (1): 79-85.doi: 10.11849/zrzyxb.2006.01.010

• Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS • Previous Articles     Next Articles

Study on the Climate Change Trend and Its Catastrophe over "Sanjiangyuan" Region in Recent 43 Years

LI Lin, LI Feng-xia, GUO An-hong, ZHU Xi-de   

  1. 1. Qinghai Climate and Data Center,Xining 810001,China;
    2. Qinghai Insititute of Meteorological Science,Xining 810001,China;
    3. Chinese Academy of Meteorological Science,Beijing 100081,China
  • Received:2005-06-23 Revised:2005-09-26 Online:2006-02-25 Published:2006-02-25

Abstract: Using air temperature and precipitation data in 1962-2004 of 14 meteorological stations over "Sanjiangyuan"(head waters of three rivers) region,the changing trend of climate factors and its abrupt changes in evaporation and precipitation as well as air temperature are analyzed.The results show that the seasonal mean air temperature and annual mean over "Sanjiangyuan" region has been rising in recent 43 years,the rising of annual mean air tempera-ture is caused by the rising mean air temperature in summer and autumn;the variation of precipitation in a year,summer and autumn has been slightly decreasing,while the precipitation in winter,and spring has been increasing,and the warming and wet variation is featured in different seasons;the annual and seasonal variations of evaporation have been increasing under the condition of air temperature's rising,and precipitation is regarded as the main material resource of evaporation.Its variation trend,to some extents,causes the variation characteristics of evaporation.The climate change shows significant regional difference,the orographic factor of latitude,longitude and sea level has a significant influence upon the climate change,and annual mean temperature presented abrupt change in 1987 which is consistent with air temperature over the northwest region,but the abrupt change occurred earlier than that in northern hemisphere.The precipitation in winter and spring presented an increasing trend in the 1980s and the mid 1970s,and abrupt change in annual evaporation appeared in 1986-1988.Due to global warming,the evapotranspiration on land surface and evaporation on ocean has been increasing;as a result,the water-vapour cycle was accelerated,which is the main cause of warming/wet variation over the "Sanjiangyuan" region.

Key words: climate change, climate catastrophe, "Sanjiangyuan", region