中国农业气象

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湖北省倒春寒发生程度评估模型

马德栗;刘敏;李兰;邓爱娟;   

  1. 武汉区域气候中心;
  • 出版日期:2011-02-10 发布日期:2011-02-10
  • 基金资助:
    国家科技支撑计划项目“南方冰雪灾害天气预测预警评估技术研究”第四课题“南方冰雪灾害评估技术研究”(2008BAC48B00);; 湖北省气象局重点项目“湖北省气候变化监测分析业务系统研制”(QY-Z-201009)

Assessment to Impacts of Late Spring Frosts in Hubei Province

MA De-li,LIU Min,LI Lan,DENG Ai-juan(Wuhan Regional Climate Center,Wuhan 430074,China)   

  • Online:2011-02-10 Published:2011-02-10

摘要: 选取湖北省9个代表站历史倒春寒灾害序列资料,分析1951-2010年倒春寒过程中最大降温幅度、最低日平均气温、持续天数变化的特征,结合主成分分析法构建倒春寒评估模型,探讨湖北省倒春寒发生影响程度。结果表明:60a来,湖北3月倒春寒发生频次总体呈下降趋势,4月倒春寒频次以20世纪60、70年代最多,80、90年代明显下降,而2000-2010年又有所增加;倒春寒发生过程中,平均最大降温幅度的年代际间变化不大,但3月最大降温幅度大于4月;3、4月倒春寒过程最低日平均气温按年代比较显示,在2000-2010年有所降低,但不明显;1951-2010年,倒春寒持续天数平均为4.1d,呈不显著的下降趋势。运用评估模型对2010年4月12-15日的倒春寒过程评估表明,9个代表站中5站为中度倒春寒,4站为轻度倒春寒。

关键词: 倒春寒指数, 等级划分, 程度评估

Abstract: The characteristics of late spring frost,including the temperature decreasing range,average daily minimum temperature continues days,was analyzed based on late spring frost data from 9 stations in Hubei province from 1951 to 2010.Assessment model to forecasting late spring frost was established by using principal component analysis method.The results showed that the frequency of late spring frost in March generally decreased in Hubei province last 60years.The frequency of late spring frost in April decreased obviously during the 1980s and 1990s but increased in the first 10 years of this century.From decadal aspect,there was no clear trend in the average maximums temperature decrease,but it was greater in March than that in April.The minimum daily average temperature of late spring frost in March and April decreased slightly in the first 10 years of this century.The average duration of late spring frost decreased slightly from 1951 to 2010,as totally 4.1 days.

Key words: Late spring frost index, Late spring frost index, Grade classification, Impacts assessment