Diurnal Variation of Tropical Cyclone Rainfall in the Western North Pacific in 2008-2010

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• 作者：SHU Hai-LongZHANG Qing-HongXU Bin
• 会议时间：2013-10-23
• 关键词：Western North Pacific ; Tropical cyclones precipitation ; Diurnal variations
• 作者单位：SHU Hai-Long(Laboratory for Climate and Ocean-Atmosphere Studies,Department of Atmospheric and Oceanic Sciences,School of Physics,Peking University,Beijing 100871,China;Meteorological Observatory,Department of Technology,Baicheng Ordnance Test Center of China,BaiCheng city,Jilin Province,137001,China)ZHANG Qing-Hong(Laboratory for Climate and Ocean-Atmosphere Studies,Department of Atmospheric and Oceanic Sciences,School of Physics,Peking University,Beijing 100871 China)XU Bin(National Meteorological Information Center,China Meteorological Administration,Beijing 100081,China)
• 母体文献：第30届中国气象学会年会论文集
• 会议名称：第30届中国气象学会年会
• 会议地点：南京
• 主办单位：中国气象学会
• 语种：chi

摘要

Diurnal variation of tropical cyclone (TC) rainfall in the western North Pacific (WNP) is investigated using the high-resolution Climate Prediction Center’s morphing technique (CMORPH) products obtained from the National Oceanic and Atmospheric Administration (NOAA).From January 2008 to October 2010,72 TCs and 389 TC rainfall days were reported by the Joint Typhoon Warning Center’s (JTWC) best-track record.The TC rain rate was partitioned using the Objective Synoptic Analysis Technique (OSAT) and interpolated into Local Standard Time (LST).Harmonic analysis was applied to analyze the diurnal variation of the precipitation.Obvious diurnal cycles were seen in a1pproximately 70% of the TC rainfall days.The harmonic amplitude and phase of the mean TC rainfall rate vary with TC intensity,life stage,season,and spatial distribution.On the basis of intensity,tropical depressions (TDs) exhibit the highest precipitation variation amplitude (PVA),at approximately 30%,while super typhoons (STs) contain the lowest PVA,at less than 22%.On the basis of lifetime stage,the PVA in the decaying stage (more than 37%) is stronger than that in the developing (less than 20%) and sustaining (28%) stages.On the basis of location,the PVA of more than 35% (less than 18%) is the highest (lowest) over the high-latitude oceanic areas (the eastern ocean of the Philippine Islands).In addition,a sub-diurnal cycle of TC rainfall occurs over the high-latitude oceans.On the basis of season,the diurnal variation is more pronounced during summer and winter,at approximately 30% and 32%,respectively,and is weaker in spring and autumn,at approximately 22% and 24%,respectively.