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福建前汛期持续性极端降水事件的多尺度扰动特征分析
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作者 曹蓉 杨开甲 何芬 《海峡科学》 2024年第5期20-28,共9页
利用NCEP和NCAR再分析资料,以及福建省66个国家气象站逐日降水资料,探讨1961—2022年福建前汛期(4—6月)持续性极端降水事件(PEPEs)的多尺度扰动特征。结果表明,大多数PEPEs都存在天气、准双周和次季节尺度的显著周期,且多尺度相互作用... 利用NCEP和NCAR再分析资料,以及福建省66个国家气象站逐日降水资料,探讨1961—2022年福建前汛期(4—6月)持续性极端降水事件(PEPEs)的多尺度扰动特征。结果表明,大多数PEPEs都存在天气、准双周和次季节尺度的显著周期,且多尺度相互作用会增强降水强度;来自青藏高原下游的天气和准双周尺度扰动、西北太平洋西传的次季节扰动、热带洋面北上的天气、准双周和次季节尺度扰动及南下的天气尺度Rossby波波能交汇于福建省,带来持续性极端降水。 展开更多
关键词 前汛期 极端降水 气尺度扰动 低频振荡 福建省
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DIAGNOSIS OF WAVE ACTIVITY OVER RAINBAND OF LANDFALL TYPHOON 被引量:5
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作者 冉令坤 Abdul REHIM AL RAMANATHAN 《Journal of Tropical Meteorology》 SCIE 2009年第2期121-129,共9页
A generalized wave-activity density, which is defined as an absolute value of production of three-dimensional vorticity vector perturbation and gradient of general potential temperature perturbation, is introduced and... A generalized wave-activity density, which is defined as an absolute value of production of three-dimensional vorticity vector perturbation and gradient of general potential temperature perturbation, is introduced and its wave-activity law is derived in Cartesian coordinates. Constructed in an agoestrophic and nonhydrostatie dynamical framework, the generalized wave-activity law may be applicable to diagnose mesoscale weather systems leading to heavy rainfall. The generalized wave-activity density and wave-activity flux divergence were calculated with the objective analysis data to investigate the character of wave activity over heavy-rainfall regions. The primary dynamical processes responsible for disturbance associated with heavy rainfall were also analyzed. It was shown that the generalized wave-activity density was closely correlated to the observed 6-h accumulative rainfall. This indicated that the wave activity or disturbance was evident over the frontal and landfall-typhoon heavy-rainfall regions in middle and lower troposphere. For the landfall-typhoon rainband, the portion of generalized wave-activity flux divergence, denoting the interaction between the basic-state cyclonic circulation of landfall typhoon and mesoscale waves, was the primary dynamic process responsible for the evolution of generalized wave-activity density. 展开更多
关键词 dynamic meteorology wave-activity density wave-activity flux divergence landfall typhoon heavy-rainfall event
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