简介:DYNAMICALEFFECTSOFTYPHOONBACKGROUNDFLOWONTYPHOONSUBCIRCULATIONANDTYPHOONMOTIONKangDi(亢迪)(InstituteofSynopticandDynamicMeteoro...
简介:-Inthispaperasimpleandefficientimplicitfinite-differenceschemeisusedfordepth-averagedtwo-dimensionalstormsurgemodel.Thisfinite-differenceschemeissimplerandmoreefficientthanthewi-dely-usedADIscheme.Accuracyanalysisandstabilityanalysisindicatethattheschemehastwo-orderac-curacyandisunconditionallystablewhenthegridsizeisconstant.ThepresentanalysisresultsshowthattheschemeisofhighernumericalaccuracythanthatintroducedbyMaa(1990).Aftertestedbyidealmod-els,acalculationexampleofarealtyphoonsurgeiscarriedout,theresultsofthenumericalsimulationco-incidewellwiththeobserveddataandtheaccuracyissufficientforengineeringapplications.
简介:BasedontheGlobalRegionalAssimilationandPredictionSystem-TropicalCycloneModel(GRAPES-TCM),anensembleforecastexperimentwasperformed,inwhichTyphoonWiphaduringtheperiodimmediatelypriortolandfallwasselectedforthestudyandthebreedingofgrowingmode(BGM)methodwasusedtoperturbtheinitialconditionsofthevortexfieldandtheenvironmentfield.TheresultsoftheexperimentindicatethateachmemberhadadifferentinitialstatusinBGMprocessingandtheyshowareasonablespreadamongmembersalongwiththeforecastphase.Changesinthelarge-scalefield,thermodynamicstructure,andspreadamongmemberstookplacewhenWiphamadelandfall.Thesteeringeffectofthelarge-scalefieldandtheinteractionbetweenthethermodynamicsandthedynamicsresultedindifferenttracksofthemembers.Meanwhile,theforecastuncertaintyincreased.Insummary,theensemblemeandidnotperformaswellasthecontrolforecast,buttheclustermeanprovidedsomeusefulinformation,andperformedbetterthanthecontrolinsomeinstances.Thepositionerrorwas34kmfor24hforecast,153kmfor48hforecast,and191kmfor66hforecast.Thestrikeprobabilitychartqualitativelydescribedtheforecastuncertainty.
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简介:在2005的四个landfalling台风盒子与全球/地区性的吸收和预言系统(葡萄)模型为数字模拟研究被选择。包括台风轨道的预言,模型的表演的初步的评价结果乍见陆地预定,地点和紧张,等等,被介绍,错误的来源被分析。由模型的台风中心的24小时的距离预报错误被显示是大约131km,当48小时的错误是252km时。模型是相对在预报更熟练乍见陆地时间和地点比那些紧张在乍见陆地。平均,24小时的预报比48小时的稍微好。数据影响的分析显示异乎寻常的观察数据的吸收为模型模拟的改进是必要的。模型能被增加模型分辨率模仿mesoscale和好规模系统并且由改进地面精炼处理的方法也改进。
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简介:TheMM5anditsfourdimensionalvariationaldataassimilation(4D-Var)systemareusedinthispaper.BasedontheNationalCentersforEnvironmentalPrediction/NationalCenterforAtmosphericResearch(NCEP/NCAR)reanalysisdata,theauthorsgenerateanoptimalinitialconditionforatyphoonbyusingthebogusdataassimilation(BDA)scheme.BDAisabletorecovermanyofthestructuralfeaturesoftyphoonsincludingawarm-corevertex,thecorrectcenterposition,andthestrongcirculation.AsaresultofBDAusingabogussurfacelow,dramaticimprovementisachievedinthe72hpredictionoftyphoonHerb.Throughseveralcases,theinitializationbyBDAeffectivelygeneratestheharmoniousinnerstructureofthetyphoon,butwhichislackingintheoriginalanalysisfield.Thereforetheintensityforecastisimprovedgreatly.Someimprovementsaremadeinthetrackforecast,butmoreworkstillneedstobedone.
简介:用高分辨率的非静水力学的模型ARPS(先进地区性的预言系统),台风Rananim(0414)被使用CINRADDoppler雷达数据模仿。在台风前后的结果乍见陆地证明模型ARPS表现很好模仿轨道,中心压力的变化,以及Rananim的严重大雨。同时,模仿的合成反射率与观察雷达相比是合成反射率。数字结果表明Rananim的不均匀的结构在它向西偏斜在以后起一个重要作用乍见陆地。Rananim(0414)上的地面效果的敏感模拟实验也被调查,并且东南的中国的地面在它的轨道稍微向右转并且显然增加它的紧张的Rananim上有重要效果,但是当台风是远的离开海岸线时,地面仅仅稍微影响暴风雨紧张在期间它的乍见陆地。结果证明地志的上升极大地作出贡献到降水改进,并且使降水的分发更不平。[出版摘要]
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简介:MM5,它是PSU/NCAR中央放大非静水力学的有限区域的模型,并且它毗连当模特儿的系统在这篇论文被使用。由使用二假数据吸收的台风的一个最佳的起始的条件策划的作者产生的背景回答的拿的T106分析数据,和某数字模仿试验的行为。No.9608typhoon(葛洛丽亚)的结果证明最佳的起始的地有一些戏剧的改进,例如台风中心,更弱的台风发行量和台风的不完全的内部结构的不精密的位置,它被数据的缺乏在海上引起。一些改进在轨道预报被做了。通过几个比较实验,BDAscheme优化的初始化比GFDL计划和它的台风路经预报更好被发现更合理。
简介:WepartitiontheobservedwindfieldintorotationalanddivergentwindfieldstoanalyzethestreamfieldofTy-phoonPolly(No.9216),whichlandedon31August1992andcausedsevereweatherandlargedamageintheeasternChina.Theresultsindicatethatthepreservationoftyphoonintensityafterlandingandtheheavyrainfalltookplaceonthenorthernperipheryoftyphoonareduetothestrongdivergentwindsontheregionsoflowleveljet(LLJ)andhighleveljet(HLJ)aroundthetyphoon.ThedirectionofdivergentwindsintheLLJisperpendiculartotheobservedwind.But,thedirectionofdivergentwindsaroundtheHLJaxisisparalleltotheobservedwinds.Thestreamfunctionandtherotationalwindcorrespondingtothehorizontalvorticitydisplaytheverticalcirculationassociatedwiththeheavyrain,whichisstrongerthantheverticalcirculationaroundthetyphooncenter.Thethree-dimensionaltrajectoriesexhibitthewarmandmoistairparcelsofLLJtravelingnorthwardintotheheavyrainfallregionandascending,thenturningeastwardintheHLJ.
简介:概括波浪活动密度,被定义为三维的涡度向量不安和一般潜在的温度不安的坡度的生产的绝对值,被介绍,它的波浪活动法律在笛卡儿的坐标被导出。在agoestrophic和nonhydrostatic构造了动态框架,概括波浪活动法律可能是适用的诊断导致重降雨的mesoscale天气系统。概括波浪活动密度和波浪活动流动分叉与客观分析数据被计算在重降雨的区域上调查波浪活动的字符。为与重降雨联系的骚乱负责的主要动态过程也被分析。概括波浪活动密度密切被相关到观察6-h,这被显示出积聚的降雨。这显示波浪活动或骚乱是明显的在上正面并且乍见陆地台风在中间、更低的对流层的重降雨的区域。为乍见陆地台风雨线,概括波浪活动流动分叉的部分,表示在基本状态的气旋的发行量之间的相互作用乍见陆地,台风和mesoscale飘动,是为概括波浪活动的进化负责的主要动态过程密度。
简介:TYPHOON:SCIENTIFIC/OPERATIONALEXPERIMENTSANDDYNAMICTHEORETICALSTUDY¥ChenLianshou(陈联寿)andXuXiangde(除祥德)TYPHOON:SCIENTIFIC/OPER...
简介:2004台风Aere的降水的结构的特征从测量国家航空学空间管理(NASA)的使命(TRMM)的热带降雨用高分辨率的数据被分析。台风的特征在它的发展的不同阶段变化,这被发现。分析降水分发的不对称的引起,从环境预言(NCEP)分析的国家中心的数据被用来计算水蒸汽流动向量的垂直积分。因为这个过程,结果显示出那,与成双台风的循环的唯一的现象一起,在东方台风的北方面的空气电流和它的南部的方面的西南的空气水流在搬运水起一个联合作用蒸汽。而且,它的运输效果在开发的不同阶段极大地变化,显示出为这台风进程的水来源的怪癖。由重降水和水蒸汽流动的一个最大值的区域描绘区域的台风传送对流的分布,以及在台风的发展的不同阶段的强壮的上升运动区域不同。水蒸汽流动和垂直运动的不一致的分发引起台风降水的不均匀的分发。
简介:Anf-planequasi-geostrophicbarotropicvorticityequationmodelofhighresolutionisdesignedinthispaperinordertoinvestigatethecharactersofvorticitypropagationandtheeffectofnonlinearityonthepropagationwithinatyphooncirculation,whereintwomesoscalevorticescoexistatdifferentradialpositions.Theresultsof10setsofexperimentssuggestthatincomparisonwithonlyonevortex,theintensityoftheinwardpropagationsofvorticitystrengthensdistinctly,vorticitydetainsintheinnerregionoftyphooncirculationforalongertime,andthelocalmaximumwindspeedintheinnerregionincreasesclearly.Theintroductionofnonlinearadvectionintothemodelweakenstheintensityofbothinwardandoutwardpropagationsofvorticity,butmakestheinwardpropagationuptoapositionclosertothecenteroftyphoon.