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《SCIENTIA ATMOSPHERICA SINICA》 1999-01
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Preliminary Studies on Variations of Drought/Flood of the Last 45 Years in Lhasa

Du Jun (Meteorological Observatory of Tibet Autonomous Region, Lahsa 850000)  
By using the method of bi-value time series analysis, the rule, persistance, turning and cycle of drought/flood in Lhasa are dicussed, and the relationship between sunspot and drought/flood is studied The results show that the chance of flood is more than drought, the persistance of drought/flood prevail over the turining On the avarage, after the occurence of drought/flood, it will be 2~3 years non-drought/non-flood period The main oscillation of flood/drought is 2~3 years, 3 and 6~7 years The drought often happens in the same year and the next year of sunspot low-value, and in the same year of sunspot high-value; and the first and third year after then however the flood happen in the second year after the year of sunspot high-value
【CateGory Index】: P467
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