A Study of Dynamic Change of Dry and Wet Climate Regions in the Tibetan Plateau over the Last 46 Years
Using daily meteorological data at 62 stations from 1961 to 2006 in the Tibetan Plateau, the potential evapotranspiration is estimated with the Penman-Monteith (recommended by FAO in 1998) model, and the five moisture indexes, which are precipitation, the ratio of accumulated temperature to precipitation, the ratio of air temperature to precipitation, the ratio of evapotranspiration to precipitation and the ratio of precipitation to evapotranspiration, are compared. The dry and wet conditions in each climate region and dynamic change of the boundaries between different climate regions in the Tibetan Plateau over the last 46 years are analyzed based on general statistic methods and Mexican Hat wavelet. The mainly results show that the distribution of humid, semi-humid, semi-arid, arid and extreme arid climate regions in the Tibetan Plateau given by using the ratio of precipitation to evapotranspiration is the most reasonable in the distributions given by using the five indexes. Over the last 46 years, the moisture index values in the most places of the Tibetan Plateau and the average moisture index values in each climate region increase and the boundary between the humid region and the semi-humid region moves northwestward. The climate in the Tibetan Plateau changes toward warm-wet climate.
the Tibetan Plateauthe dry and wet climate regionsdynamic change
国家科技期刊平台
NSTL
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