Variation Characteristics Analysis of Time Series of Potential Evapotranspiration in Beijing
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Abstract:
Regional evapotranspiration is an important moisture indicator of regional weather and agricultural production. In this paper, the potential evapotranspiration (ET) in Beijing from 1960 to 2011 was calculated using the Penman-Monteith Method recommended by FAO, and the major impact factors of potential ET and their variation trends were investigated. Moreover, the multi-scale and periodic analysis of the time series variation of potential ET was conducted. The results showed that (1) the potential ET increased with a rate of 0.54 mm per year, while the increasing trend was not apparent without mutational point from the Mann-Kendall test; (2) the rising temperature and decreasing precipitation resulted in the increasing in potential ET , while the decreasing sunshine duration led to the reduction of potential ET; and (3) generally, variations of temperature and precipitation had larger effects on potential ET. The multi-scale and periodic analysis of potential ET indicated that the periodic characteristics appeared at the time scales of 14 years, 11 to 12 years, and 5 to 6 years. The time domains and strengths of signal frequency distribution varied, and the periodic characteristics of potential ET in recent 15 years were also different from those in the past.
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