简介：BasedontheTaylorseriesmethodandLi’sspatialdifferentialmethod,ahigh-orderhybridTaylor–Lischemeisproposed.Theresultsofalinearadvectionequationindicatethat,usingtheinitialvaluesofthesquare-wavetype,aresultwiththirdorderaccuracyoccurs.However,usinginitialvaluesassociatedwiththeGaussianfunctiontype,aresultwithveryhighprecisionappears.Thestudydemonstratesthat,whentheorderofthetimeintegralismorethanthree,thecorrespondingoptimalspatialdifferenceordercouldbehigherthansix.Theresultsindicatethatthereasonforwhythereisnoimprovementrelatedtoanorderofspatialdifferenceabovesixistheuseofatimeintegralschemethatisnothighenough.TheauthoralsoproposesarecursivedifferentialmethodtoimprovetheTaylor–Lischeme’scomputationspeed.Amorerapidandhighprecisionprogramthandirectcomputationofthehigh-orderspacedifferentialitemisemployed,andthecomputationspeedisdramaticallyboosted.Basedonamultiple-precisionlibrary,theultrahigh-orderTaylor–LischemecanbeusedtosolvetheadvectionequationandBurgers’equation.

简介：Byusinganine-levelatmosphericgeneralcirculationmodeldevelopedattheInstituteofAtmosphericPhysics(IAP9LAGCM),twosetsofnumericalexperimentsarecarriedouttoinvestigatetheinfluenceoftheMascarenehigh(MH)andAustralianhigh(AH)overthesouthernsubtropicsupontheEastAsiansummermonsooncirculationandsummerprecipitationinEastAsia.Theuseofensemblestatisticsisadoptedtoreducethesimulationerrors.TheresultshowsthatwiththeintensificationofMH,theSomalilow-leveljetissignificantlyenhancedtogetherwiththesummermonsooncirculationinthetropicalAsiaandwesternPacificregion.Furthermore,theanticyclonicanomalyinthetropicalwesternPacifictotheeastofthePhilippinesmayinduceaweakEast-Asia-Pacificteleconnectionpattern.Inthemeantime,geopotentialheightintheTropicsisenhancedwhileitisreducedovermostregionsofmid-highlatitudes,thusthenorthwesternPacificsubtropicalhighat500hPaextendssouthwestward,resultinginmorerainfallinsouthernChinaandlessrainfallinnorthernChina.AsimilaranomalypatternoftheatmosphericcirculationsystemsisfoundintheexperimentoftheintensificationofAH.Ontheotherhand,becausethecross-equatorialcurrentsassociatedwithAHaremuchweakerthantheSomalijet,theanomalymagnitudecausedbytiheintensificationofAHisgenerallyweak,andtheinfluenceofAHonsummerrainfallinChinaseemstobelocalizedinsouthernChina.ComparisonbetweenthetwosetsofexperimentsindicatesthatMHplaysacrucialroleintheinteractionsofgeneralatmosphericcirculationbetweenthetwohemispheres.

简介：ThecharacteristicsandpossiblephysicalmechanismofinterdecadalvariationoftheintensityoftheSouthAsianHigh(SAH)insummerareanalyzedusingtheNCEP/NCARreanalysisdataandNOAAextendedreconstructedseasurfacetemperature(SST)data.Theresultsindicatethataremarkableinterdecadaltransitionoccurredinthelate1970sthatincreasedtheintensityofSAH,or,anabruptclimatechangewasaround1978.AcomparativeanalysisbetweentheweakandstrongperiodoftheSAHintensityshowsthattherelatedanomalouspatternsoftheatmosphericcirculation(includingwindfield,airtemperaturefieldandverticalvelocityfield)arenearlyoppositetoeachother.Thesurfacelatentheatfluxanomaliesovertheplateau(especiallyinthenorthwestoftheplateau)insummerexertgreatinfluenceontheinterdecadalvariationoftheSAHintensityandthesurfacesensibleheatfluxanomaliesplayamoreimportantrole.ConsistentwiththeinterdecadalvariationoftheSAHintensity,themonopolemodeofthetropicalIndianOceanSSTinsummeralsoexperiencedalowtohightransitioninthelate1970s.Tosomeextent,thiscanrevealtheimpactoftheanomalousmonopolemodeofthetropicalIndianOceanSSTinsummeroninterdecadalvariationoftheSAH.

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简介：与大约2个小时的时期，高周波的摆动被把小浪分析用于首先识别详细地绕热带气旋(TC)的眼睛和eyewall观察了风速度。台风Hagupit(2008)的模型模拟的分析证明摆动也在eyewall附近发生在TC紧张，垂直运动，集中活动和空气密度。在这些变量的摆动的序列跟随某个顺序。

简介：GrowingevidenceindicatesthattheAsianmonsoonplaysanimportantroleinaffectingtheweatherandclimateoutsideofAsia.However,thisactiveroleofthemonsoonhasnotbeendemonstratedasthoroughlyashasthevariabilityofthemonsooncausedbyvariousimpactingfactorssuchasseasurfacetemperatureandlandsurface.ThisstudyinvestigatestherelationshipbetweentheAsianmonsoonandtheclimateanomaliesintheAsian-Pacific-American(APA)sector.Ahypothesisistestedthatthevariabilityoftheupper-troposphericSouthAsianhigh(SAH),whichiscloselyassociatedwiththeoverallheatingofthelarge-scaleAsianmonsoon,islinkedtochangesinthesubtropicalwesternPacifichigh(SWPH),themidPacifictrough,andtheMexicanhigh.ThechangesinthesecirculationsystemscausevariabilityinsurfacetemperatureandprecipitationintheAPAregion.AstrongerSAHisaccompaniedbyastrongerandmoreextensiveSWPH.TheenlargementoftheSWPHweakensthemid-Pacifictrough.Asaresult,thesouthernportionoftheMexicanhighbecomesstronger.Thesechangesareassociatedwithchangesinatmosphericteleconnections,precipitation,andsurfacetemperaturethroughouttheAPAregion.WhentheSAHisstronger,precipitationincreasesinsouthernAsia,decreasesoverthePacificOcean,andincreasesovertheCentralAmerica.PrecipitationalsoincreasesoverAustraliaandcentralAfricaanddecreasesintheMediterraneanregion.Whilethesignalsinsurfacetemperatureareweakoverthetropicallandportion,theyareapparentinthemidlatitudesandovertheeasternPacificOcean.

简介：ThisworkinvestigatesthedistributionofhighwindsaboveBeaufortscale6intheoffshorezonesofChinausinghigh-resolutionsatellitemeasurements.AnumericalexperimentiscarriedoutinordertofindouttheeffectsofTaiwanIslandontheformationofstrongwinds.Theanalysisindicatesthatthedistributionofhighwindoccurrenceissimilartothatoftheaveragewindvelocityinwinter.Highwindstendtobeanchoredinspecialtopographicalregions,suchastheTaiwanStrait,theBashiChannelandthesoutheastcoastofVietnam.HighwindsoccurmuchmorefrequentlyoverthewarmerthanthecolderflankofKuroshiofrontasitmeandersfromTaiwantoJapan.Thefrequencyofhighwindsdecreasesdrasticallyinspring.TheTaiwanStraitmaintainsthelargesthighwindoccurrence.Besides,highwindsremainfrequentintheBashiChannel,thesoutheasttipofTaiwanIslandandthewarmerflankofKuroshiofront.Insummer,highwindsgenerallyoccurinfrequentlyexceptoverabroadregionoffthesoutheastcoastofVietnamnear10°Nandthefrequencytheredecreasesfromsouthwesttonortheast.HighwindsaroundTaiwanIslandpresentnearaxisymmetricdistributionwithlargerfrequencyalongsoutheast-northwestdirectionandsmallerfrequencyalongsouthwest-northeastdirection.Thedominantdirectionofhighwindsexhibitsacounterclockwisecirculationsurroundingtheisland.Thefrequencyofhighwindsincreasesrapidlyinautumnandalmostrepeatsthedistributionthatappearsinwinter.ThesimulationresultssuggestthattheeffectsofTaiwanIslandtopographyonhighwindsvarywithseasons.Inwinter,topographyisthemajorcauseofhighwindsinthesurroundingoceaniczones.HighwindsinbothTaiwanStraitandthesoutheastcorneroftheislanddisappearandthefrequencydecreasesgraduallyfromsouthtonorthwhentheterrainisremoved.However,insummer,highwindfrequencyderivedfromtwosimulationswithandwithoutterrainisalmostidentical.Weattributethisphenomenontothefactorswhicharerespon

简介：用NCEP/NCAR每日的分析数据和SCSMEX数据，调查从在向西和平的副热带的高度(WPSH)并且基于完全的垂直涡度方程的在1998年6月的明显的加热的位置变化之间的关系被带。Itis发现非断热的加热与气候的吝啬的地位在WPSH.In比较的位置变化起一个重要作用，非断热的加热的垂直变化在在1998年6月的WPSH的北方方面是更强壮的，但是在WPSH的南方方面更弱。加热的anomalousnon制服在印度支那Peninsulaand华南海区域在华南，到theYangtze和它的中间降低山谷的南方的区域，而是异常逆旋风的涡度导致异常气旋的涡度比平均数导致WPSH的更向南方的位置。

简介：在1993/1994的夏天在西藏的高原和NCEP/NCAR分析数据，在东方西藏的高原降雨之间的关系和向西和平的副热带的高度的southward/northward移动上基于平淡的降雨数据被学习。结果显示出那：向西和平的副热带的高度反常地被定位到更南部的纬度，高山脉主要是在它的过程的伪双周刊southward/northward摆动向北方在1993从5月变到8月；但是它反常地被定位到更北的纬度，高山脉显然是在它的过程的30-60-daysouthward/northward摆动向北方在1994从5月变到8月。同时，东方西藏的高原降雨active/break的变化有高山脉southward/northward摆动的类似的特征，这被发现。因此，在夏天的向西和平的副热带的高度的southward/northward移动可能与东方西藏的高原降雨active/break的变化有关。[出版摘要]

简介：Bystatisticanddynamicanalyses,wehavecometothefollowingconclusions:(1)TheECMWFmedium-termnumericalforecastcanforecastmedium-termactivityofsubtropicalhigh,andtheaccuracyrateofforecastcannothavelargeimprovementbytranslationalcorrections.(2)TheimportantcausefortheECMWFmedium-termnumericalforecasttohaveerrorsin1998isthattheastronomicaltideisnotincludedinthemodel.(3)TwoindexesarefoundfromwhichitcanbejudgedthatECMWFmedium-termnumericalforecastwillhaveerrorsiftheastronomicaltideisignoredinthemodel:①Whenthe54.7°lineunderthemoonofthenodicalmonthastronomicalsingularitiescoincideswiththetrough-lineofthesubtropicaljetflowfrom50°Eto150°Eonthe500hPalevelat2000L.T.ofthesameday,andisapproximatelyvertical(α>60°)withtheisotherm,thentheday0-2daysaftertheappearanceofthenodicalmonthastronomicalsingularitiesisdefinedastheinitialday.Theninthreesuccessivedaysaftertheinitialday,ECMWFmedium-termnumericalforecastofthenorthernlatitudeofthe588lineat120°Ewillhavecontinuouserrorsaslargeastwolatitudes(7/9).Otherwise,itwon'thavecontinuouserrors(13/13).②Otherwise,ifthe54.7°lineisintherangeofalowpressurebetweentwohighpressures,thenthereisadispersiveerroronthedayofthenodicalmonthastronomicalsingularities(5/7).Thereisnotanyerror(6/6)otherwise.

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简介：根据学习波浪包裹繁殖，这份报纸调查了在高频率波浪包裹繁殖和短暂波浪的发展或副热带的高度的纬度的运动之间的关系。结果证明在冬季期间，波浪包裹的一生为有2-10ms-1的宣传速度的7-10天更长、通常坚持。通常，他们宣传了在开始向东南，然后转到东北。在夏天期间，波浪包裹的一生和紧张变得更短、更弱。它有利马槽的开发(变细)当强壮的波浪包裹中心被加强时(变弱)它与马槽重叠了。如果强壮的波浪包裹中心不停地与山脉重叠，山脉以后将在一些天内减退。向北方的明显的跳(撤退向南方)西方的和平的副热带的高度(WPSH)的过程是(不)通常与在华南海区域(南亚区域和适度的地区)定位5天的强壮的波浪包裹中心有关或更长。在二个季节的跳过程以后，正在坚持强壮的波浪包裹中心5天或更长。WPSH撤退过程象台风，和坚持5天的所有这些中心的强壮的波浪包裹中心一样也与在南方亚洲人区域和适度的区域上的强壮的波浪包裹中心的活动有关或更长。[出版摘要]

简介：在3月16-17,2008日，海雾在广东省的西方在Dianbai发生了并且被高压的摘要的system.Using伴随全面观察数据集，这研究在这海雾期间分析液体水内容的进化并且调查海雾显示出的在液体水内容和平均直径和主要结果表现为的exchanges.The跟随的雾微滴，空气温度，风速度和骚乱的计数密度(1)之间的关系伪每

简介：ThispapersummarizesrecentprogressattheStateKeyLaboratoryofNumericalModelingforAtmosphericSciencesandGeophysicalFluidDynamics(LASG),InstituteofAtmosphericPhysics,ChineseAcademyofSciencesinstudiesontargetedobservations,dataassimilation,andensembleprediction,whicharethreeeffectivestrategiestoreducethepredictionuncertaintiesandimprovetheforecastskillofweatherandclimateevents.Consideringthelimitationsoftraditionaltargetedobservationapproaches,LASGresearchershavedevelopedaconditionalnonlinearoptimalperturbation-basedtargetedobservationstrategytooptimizethedesignoftheobservingnetwork.ThisstrategyhasbeenemployedtoidentifysensitiveareasfortargetedobservationsoftheElNi?o–SouthernOscillation,IndianOceandipole,andtropicalcyclones,andhasbeendemonstratedtobeeffectiveinimprovingtheforecastskilloftheseevents.Toassimilatethetargetedobservationsintotheinitialstateofanumericalmodel,adimension-reducedprojection-basedfour-dimensionalvariationaldataassimilation(DRP-4DVar)approachhasbeenproposedandisusedoperationallytosupplyaccurateinitialconditionsinnumericalforecasts.TheperformanceofDRP-4DVarisgood,anditscomputationalcostismuchlowerthanthestandard4DVarapproach.Besides,ensembleprediction,whichisapracticalapproachtogenerateprobabilisticforecastsofthefuturestateofaparticularsystem,canbeusedtoreducethepredictionuncertaintiesofsingleforecastsbytakingtheensemblemeanofforecastmembers.Inthisfield,LASGresearchershaveproposedanensembleforecastmethodthatusesnonlinearlocalLyapunovvectors(NLLVs)toyieldensembleinitialperturbations.ItsapplicationinsimplemodelshasshownthatNLLVsaremoreusefulthanbredvectorsandsingularvectorsinimprovingtheskilloftheensembleforecast.Therefore,NLLVsrepresentacandidateforpossibledevelopmentasanensemblemethodinoperationalforecasts.Despitetheconsi

简介：学习由诊断分析和数字模拟在6月在鄂霍次克海海上在阻塞高压上检验了海面温度异常(SSTA)的效果离开日本的东方海岸。第一基于500-hPa重力势高度领域，为从1951～2000的6月的鄂霍次克海高索引(OKHI)计算、分析。结果显示OKHI有明显的内部年度、内部十的变化，并且有9年高OKHI和8年50年里的lowOKHI。由使用OKHI，第二，在鄂霍次克海高度和the500-hPa重力势高程异常之间的关系被调查。结果显示“在中间高度的纬度的+-+'模式ofgeopotential高程异常十字路口欧亚大陆并且”+—“到在东亚上的低纬度的从高度的模式ofgeopotential高程异常高赞成鄂霍次克海的形成和维护。在在NorthPacific上的OKHI和SSTA之间的关系被使用关联和合成分析在早夏天调查。我们发现当在鄂霍次克海海上的堵住的发行量发生时，离开在早夏天的日本的东方海岸有明显的否定SSTA。我们通过用NCARCAM3的实验建模以便证实我们的分析结果的控制和敏感在东亚上在大气循环异例上模仿了日本的东方海岸的否定SSTA的效果。模拟证明离开日本的东方海岸的否定SSTA导致重要积极在离开可能在6月高贡献鄂霍次克海的形成和发展的日本的东方海岸的鄂霍次克海海和负异常上的40gpm500-hPa重力势高程异常。

简介：Earlyproxy-basedstudiessuggestedthattherepotentiallyoccurreda"southerndrought/northernflood"(SDNF)overEastChinainthemid-Holocene(fromroughly7000to5000yearsbeforepresent).Inthisstudy,weusedbothglobalandregionalatmosphericcirculationmodelstodemonstratethattheSDNF—namely,theprecipitationincreasesoverNorthChinaanddecreasesoverthethelowerreachesoftheYangtzeRiverValley—couldhavetakenplaceinthemid-Holocene.WefoundthattheSDNFinthemid-HolocenewaslikelycausedbythelowerSSTinthePacific.TheloweredSSTandthehigherairtemperatureovermainlandChinaincreasedtheland–seathermalcontrastand,asaresult,strengthenedtheEastAsiansummermonsoonandenhancedtheprecipitationoverNorthChina.