摘要
[目的]研究塔额盆地大风的时间变化特征。[方法]利用1961~1999年塔额盆地4个气象站大风天气的观测资料,分析了盆地大风的时间变化特征。[结果]塔额盆地年平均大风日数27~45 d,多出现在4~7月。塔城和托里大风天气高发期分别在12:30~19:30和14:00~19:00,两站大风持续时间集中在1 h以内,分别占总数的61%和68%。塔额盆地从20世纪60年代到90年代大风日数呈减少的趋势,39年内盆地年大风日数长期变化趋势系数为-0.73^-0.85。盆地年大风日数在70年代发生突变,之后大风日数明显减少。盆地大风日数年际变化具有15~20年的震荡周期,20世纪60年代至70年代为强盛周期。[结论]该研究为揭示西北地区大风的时间变化趋势与震荡周期提供科学依据。
[Objective] The objective of the research was to explore the temporal variation characteristics of gale in Taer basin.[Method] The temporal variation characteristics of gale weather were analyzed by using the observation data from 4 meteorological stations in Taer basin from 1961 to 1999.[Result] The annual gale days were 27-45 d in Taer basin,which occurred from April to July mostly.The peak period of gale in Tacheng and Toli occurred at 12：30-19：30 and 14：00-19：00,resp.The duration of gale at 2 weather stations was within an hour,accounting for 61% and 68%,resp.The yearly gale days in Taer basin were in a decreasing trend from the 1960s to the 1990s,and the long-term dynamic trend coefficient of the yearly gale days was-0.73——0.85 in 39 years in Taer Basin. The annual gale days had mutation in 1970s,and then reduced significantly.The annual variation of the gale days in Taer basin had the oscillation period during 15-20 years and it was the violence period in 1960s to 1970s.[Conclusion] The study provided a scientific basis for revealing the temporal variation trend and oscillation period of gale weather in Northwest China.
出处
《安徽农业科学》
CAS
北大核心
2009年第1期250-251,282,共3页
Journal of Anhui Agricultural Sciences
关键词
大风
变化趋势
突变
周期
Gale
Change trend
Mutation
Period
