Variations of annual average temperature and precipitation in the Mahai Basin in recent 40 years
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Abstract:
In order to investigate the climate change in the M ahai Basin of the Qinghai 2T ibet Plateau under the conditions of glob2 al warming, the variations of annual precipitation and temperature data in the Mahai Basin were analyzed using the accumulative anomaly method, Mann2Kendall test, and wavelet analysis. T he results suggested that ( 1) annual precipitation is stable from 1970 to 2010 while annual temperature has an increasing trend; ( 2) annual precipitation has a decreasing trend before 2001 and increases after that, while annual temperature has a decreasing trend before 1995 and increases after that; ( 3) the primary oscil2 lation periods of annual precipitation are 15 and 30 years while the primary oscillation period of annual temperature is 26 years; and (4) annual precipitation has different dry 2wet cycles while annual temperature has different hot2cold cycles under different time scales. The variations of precipitation and temperature are different under different time scales, and the variations are lower when the time scale is smaller.
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