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广东年、季降水量时空变化分布特征   总被引:8,自引:8,他引:2  
选取广东省86个气象观测站1966~2007年42年的逐月降水资料,应用EOF分析方法对广东省年、季降水特征进行对比分析,结果表明:年、季降水量距平第1特征向量场分布全省位相比较一致,反映全区一致偏少(多)的主要特性,雨季雨量变化的地域差异比干季大,粤西变化梯度大于粤东,山脉对这种变化分布特征的影响十分明显;上半年降水量多寡的空间变化对年雨量的多寡空间变化具有重要影响,上半年雨量的空间变化特征基本上决定了年雨量的空间变化特征。汛期降水的多寡对该年旱涝特征具有决定性影响,但也有例外。  相似文献
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潮州市前、后汛期降水量的多时间尺度特征对比   总被引:2,自引:2,他引:0  
利用潮州1957~2007年逐日降水资料,统计分析汛期降水气候特征,应用小波分析方法对比分析了前、后汛期降水量的多层次时间尺度特征,结果表明:1)前汛期降水量呈减少趋势,对全年雨量的贡献逐渐下降,后汛期则相反;逐年汛期开始的月份及降水强弱有明显的年际变化,而汛期结束的月份年际变化不显著。2)前汛期降水主要存在1.7、5.3和24.3年时间尺度的变化特征,其中1.7年最为显著;后汛期降水主要存在3.5和13.9年时间尺度的变化特征,其中13.9年最为显著。3)不同时间尺度和不同时间域上,前、后汛期降水量的对应关系有所不同,负相关性更为明显。针对目前前、后汛期降水量在短期内都处于相对偏多期的情况,建议有关部门加强防汛工作。  相似文献
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Typhoon Morakot (2009) produced 2855 mm of rain and was the deadliest typhoon to impact Taiwan with 619 deaths and 76 missing persons, including a landslide that wiped out an entire village. While Morakot did not exceed the heaviest 24-h rain record, the combination of heavy rain and long duration that led to the record accumulation is attributed to the southwest summer monsoon influence on the typhoon. Thus, a special combination of factors was involved in the Morakot disaster: (i) Strong southwesterly monsoon winds; (ii) Convergence between the typhoon circulation and monsoon flow to form an east-west oriented convective band over the Taiwan Strait that was quasi-stationary and long-lasting; (iii) A typhoon in a specific location relative to the Central Mountain Range and moving slowly; and (iv) Steep topography that provided rapid lifting of the moist air stream. The contributions of each of these four factors in leading to the Morakot disaster are reviewed primarily based on new research presented at the International Conference on Typhoon Morakot (2009). Historical data sets, new Doppler radar observations, and numerical modeling have advanced the understanding of the special conditions of monsoon-influenced typhoons such as Morakot. This research is also leading to modifications of existing and development of new forecasting tools. Gaps in scientific understanding, limits to the predictability, and requirements for advanced forecast guidance tools are described that are challenges to improved warnings of these extreme precipitation and flooding events in monsoon-influenced typhoons.  相似文献
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