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冰川冻土  2007 

扰动动能与平均动能转换率及其角动量涡旋输送与新疆暴风雪过程的关系

, PP. 250-257

Keywords: 暴风雪,扰动动能与平均动能转换,角动量涡旋输送,高值中心,负值中心,指标日

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Abstract:

用1995年5月至1999年4月KWBC北半球500hPa高度场5°×5°客观分析资料,应用谐波分析把等压面高度场沿纬圈作富利叶级数展开,计算逐日25°~80°N每隔5°纬度递增的沿纬圈的扰动动能与平均动能转换率(E)、角动量涡旋输送(RM),分析了E和RM的年、季分布特征及其与新疆暴风雪过程的关系.结果表明E和RM具有显著的季节变化和周期性;E的正高值中心与新疆暴风雪过程有较好的关系,出现E正高值中心的日期作为预报指标日,其后3~6d新疆将出现暴风雪天气过程,出现RM负低值中心的日期作为预报指标日,其后3~8d新疆有暴风雪过程发生;当E的正高值中心和RM的负值中心同时出现时,更确定了新疆暴风雪过程出现的可能性.

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