JOURNAL OF NATURAL RESOURCES ›› 2013, Vol. 28 ›› Issue (11): 1911-1921.doi: 10.11849/zrzyxb.2013.11.008

• Resources Evaluation • Previous Articles     Next Articles

The Inter-Intra Annual Climatic Pattern of Potential Evaporation in Beijing and Attribution

ZHAO Ling-ling1,2, XIA Jun2 4, WANG Zhong-gen2, LI Zong-li3   

  1. 1. Guangzhou Institute of Geography, Guangzhou 510070, China;
    2. Key Laboratory of Water Cycle & Related Land Surface Processes, Institute of Geographic Science and Natural Resources Research, CAS, Beijing 100101, China;
    3. Water Resources and Hydropower Planning and Design General Institute, Beijing 100120, China;
    4. The State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
  • Received:2012-05-21 Revised:2013-04-11 Online:2013-11-20 Published:2013-11-20
  • Contact: 夏军

Abstract: Based on the metrological data in Beijing station during 1951-2009, this paper firstly uses the Penman-Monteith formula to estimate the potential evaporation. Then the climatic character istics in inter-and intra-annual potential evaporation are analyzed. The results show that at 95% confidence level, the trend in annual potential evaporation during 1951-2009 increases significantly. The trends of relativity humidity and solar radiation decrease, temperature increases, and wind speed shows no trend in Beijing station. The sensitivity to potential evaporation (ET0) from strong to weak is relativie humidity, temperature, solar radiation and wind speed. Considering the fluctuation variation pattern of climatic variables, the contribution of temperature, VDP, wind speed and solar radiation is 13%, 58%, 17% and 11% respectively. This suggests the fluctuation of climatic variables have great effect on the change pattern of ET0, especially the wind speed. In order to detect how climatic variables affect ET0, this paper uses the detrend method considering the inter-annual change pattern combined with sensitivity of climatic variables. The detrend analysis demonstrate that the increasing temperature and decreasing relativie humidity are the main cause for increasing potential evaporation. As to the decreasing shortwave radiation, the ET0 slightly decreases, but no change in its increasing trend.

Key words: hydrology and water resources, potential evaporation, Beijing, Penman-Monteith method, sensitivity coefficient

CLC Number: 

  • P332.2