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Climatic Characteristics of the Frost Season Variation During the Last Forty Years in Lhasa
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摘要: 采用气候统计学方法，对拉萨无霜期、初（终）霜日气候特征及其气候变化进行了分析。结果表明：无霜期的绝对变率要比初、终霜日的绝对变率大，终霜日推迟的概率比初霜日提早的概率大。1954~1988年总的趋势是初霜日提早、终霜日推迟、无霜期缩短;1989年后表现为无霜期延长、初霜日推迟、终霜日提早。Abstract: The climatic characteristics and variation of the frostless period and first (late) frost date from 1954 to 1996 in Lhasa were investigated using climatological statistics method. The results show that the absolute variability of the frostless season is more than that of the first and late frost dates. The postponed probability of late frost date is bigger than the one of first frost date. The general trend was shorter for frostless period from 1954 to 1998. After 1989 the frostless period was prolonged.
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Key words:
- Frost season;
- Climatic variation;
- Analysis
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