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193 个结果
  • 简介:AclassofnonlinearcoupledsystemforElNino-SouthernOscillation(ENSO)modelisconsidered.Usingtheasymptotictheoryandmethodofvariationaliteration,theasymptoticexpansionofthesolutionforENSOmodelsisobtained.

  • 标签: 非线性模型 渐近理论 ENSO模型 模型理论
  • 简介:IthaslongbeenacknowledgedthattherearetwotypesofElNioevents,i.e.,theeasternPacificElNio(EE)andthecentralPacificElNio(CE),accordingtotheinitialpositionoftheanomalouswarmwateranditspropagationdirection.Inthispaper,theoceanicandatmosphericevolutionsandthepossiblemechanismsofthetwotypesofElNioeventswereexamined.ItisfoundthatalltheElNioevents,CEorEE,couldbeattributedtothejointimpactsoftheeastwardadvectionofwarmwaterfromthewesternPacificwarmpool(WPWP)andthelocalwarmingintheequatorialeasternPacific.BeforetheoccurrenceofCEevents,WPWPhadlongbeeninastateofbeinganomalouswarm,sothestrengthofeastwardadvectionofwarmwaterwasmuchstrongerthanthatofEE,whichplayedamajorroleintheformationofCE.WhilefortheEEevents,mostcontributioncamefromthelocalwarmingoftheequatorialeasternPacific.ItisfurtheridentifiedthattheimmediatecauseleadingtothedifferenceofthetwotypesofElNioeventswastheasynchronousvariationsoftheSouthernOscillation(SO)andtheNorthernOscillation(NO)asdefinedbyChenin1984.WhenthetransitionfromthepositivephaseoftheNO(NO+)toNO-waspriortothatfromSO+toSO-,therewouldbeeastwardpropagationofwesterlyanomaliesfromthetropicalwesternPacificinducedbyNOandhencethegrowthofwarmseasurfacetemperatureanomaliesinWPWPanditseastwardpropagation.ThiswasfollowedbylaggedSO-inducedweakeningofsoutheasttradewindsandlocalwarmingintheequatorialeasternPacific.ThesewereconducivetotheoccurrenceoftheCE.Onthecontrary,thetransitionfromSO+toSO-leadingthetransitionofNOwouldfavortheoccurrenceofEEtypeevents.

  • 标签: 厄尔尼诺 类型 赤道东太平洋 连接 振荡 传播方向
  • 简介:ApossiblemechanismisputforwardinthispaperforElNinoeventsfromtheviewpointofplatetec-tonicsandoceanicgeology.Anumberofthedataarecitedtoillustratetheviewsthatsea-bottomvolcanicac-tivitiesandhotspringsmaycauseElNinoevents.

  • 标签: VOLCANIC OCEANIC EQUATORIAL geology CITED illustrate
  • 简介:ElNinoaswellastheSouthernOscillationisoneofthestrongestsignalsknownsofaroverclimaticnoiseininterannualvariationsoftheatmosphereandoceans.Agreatnumberofstudieshaveshowndefinitelyrelationshipsbe-tweentheeventsandclimaticanomaliesinChina.Inthisreview,observationalresultsobtainedintherecentseveralyearsarefirstsummarized.ThenthepossiblephysicalmechanismsontheinfluenceofElNinoarepresentedand,finally,theassociatedproblemsarediscussed.

  • 标签: El Nino DROUGHT and FLOOR TYPHOON
  • 简介:Inthispaper,byusingspectralmethod,themonthly-andseasonal-scaleatmosphericdiabaticheatflow(ADHF)departurefieldsarediagnosedintheperiodof1964—1985with6ElNinoyearsand6anti-ElNinoyearsovertheNorthernhemisphere(NH).TheresultsshowthatElNinophenomenahavepronouncedinfluenceontheADHFdepar-turefields.Theresponseofatmosphereexhibitsapreferredarrangementoforganizingpositiveandnegativedeparturecentersatlow,middleandhighlatitudes.Inanti-ElNinoyears,theresponsehasthesameformsasinElNinoyears,butdeparturecentersareoppositeinphase.Furthermore,ADHFdepartureshowslow-frequencyoscillationinElNinoyearsandanti-ElNinoyears.ThecenterofdifferenceindeparturebetweenElNinoandanti-ElNinoyearsdisplaysabi-monthlyoscillation.Finally,throughair-seacorrelationanalysis,itispointedoutthattheSSTanomalyisthemostimportantcauseforADHFanomaly.

  • 标签: EL Nino and anti-El Nino ADHF
  • 简介:OnthebasisofNOAA/CPCdataofseasurfacetemperatureanomalyintheNinoregionsduringJan.1950-Dec.2003,thewaveletpowerspectrumofSSTwerestudiedwithsignificanceandconfidencetestingatdifferentscalesinthispaper.ItshowsthattheSSTareprovidedwithmulti-timescalesstructurenestedoneanother,andvaryonscalesof2-7years,8-20yearsand>30years.Themostsignificantvariationofthewarmandcoldepisodesisinthe4-yearbandofperiod.Thepower,frequencystructureandconfidenceofthesameepisodearedifferentindifferentNinoregions.TheintensityofoscillationsisincreasingatlowfrequencybandsanddecreasingathighfrequencybandsfromeasttowestintheNinoregions,especiallyafter1970.

  • 标签: 海洋气象 气候变化 冷热交替 SST 大气循环
  • 简介:Inthispaper,theinfluenceofElNi?oeventontheMadden-JulianOscillation(MJO)overtheequatorialPacificisstudiedbyusingreanalysisdataandrelevantnumericalsimulationresults.ItisclearlyshownthatElNi?ocanreducetheintensityofMJO.ThekineticenergyofMJOovertheequatorialPacificisstrongerbeforetheoccurrenceoftheElNi?oevent,butitisreducedrapidlyafterElNi?oeventoutbreak,andtheweakenedMJOevencancontinuetothenextsummer.Theconvectionoverthecentral-westernPacificisweakenedinElNi?owinter.ThepositiveanomalousOLRoverthecentral-westernPacifichasoppositevariationinElNi?owintercomparingtothenon-ENSOcases.TheverticalstructureofMJOalsoaffectedbyElNi?oevent,sotheoppositedirectionfeaturesofthegeopotentialheightandthezonalwindinupperandlowerleveltropospherefortheMJOarenotremarkableintheElNi?owinterandtendtobebarotropicfeatures.ElNi?oeventalsohasaninfluenceontheeastwardpropa-gationoftheMJOtoo.DuringElNi?owinter,theeastwardpropagationoftheMJOisnotsoregularandunanimousandthereexistssomeeastwardpropagation,whichisfasterthanthatinnon-ENSOcase.DynamicanalysessuggestthatpositiveSSTA(ElNi?ocase)affectstheatmosphericthicknessovertheequatorialPacificandthentheexcitedatmosphericwave-CISKmodeisweakened,sothattheintensityofMJOisreduced;thecombiningofthebarotropicunstablemodeintheatmosphereexcitedbyexternalforcing(SSTA)andtheoriginalMJOmaybeanimportantreasonfortheMJOverticalstructuretendingtobebarotropicduringtheElNi?o.

  • 标签: 厄尔尼诺事件 赤道太平洋 MJO ENSO 垂直结构 强度降低
  • 简介:把Niya节的地质的记录基于多索引的合成研究,它具有在Tarim盆的南部的边缘的高分辨率,和在南部的Xinjiang的另外的地质的记录,这篇论文重建了自从大约4.00kaBP,paleoclimatic的历史在这个区域变化。在最后4.00ka期间,南部的Xinjiang的区域经历了相对寒冷湿、相对的温暖干燥的时期的引申。三个显著寒冷湿的时期(4.00-3.45kaBP,2.50-1.90kaBP,ca。1.40?1.00kaBP)并且三个温暖干燥的时期(3.45-2.50kaBP,1.90-1.40kaBP,1.00kaBP礼品)被识别。人的活动在南部的Xinjiang与古气候的进化有一种亲密关系,这被显示出。

  • 标签: SOUTHERN XINJIANG HISTORICAL CLIMATE CHANGES
  • 简介:SeismicanisotropybeneathSouthernTibetQING-TIANLUI(吕庆田),KAI-YIMA(马开义),MEIJIANG'(姜枚),A.HirnandA.Nercessian(InstituteofMineralDe...

  • 标签: Tibetan Plateau ANISOTROPY SHEAR-WAVE SPLITTING upper
  • 简介:WestatisticallyanalyzethetropicaltyphoonformingintheSouthChinaSeaanduseTC(TropicalCyclone)forshortinthefollowing)bytyphoonyearbook.Thetyphoonquantityisverydifferentindifferentmonthsandyears.TCappearsinallmonthsexceptMarch,andthemostTCquantityinayearis11,theleastis1and6.2onaverage.ThemostTCquantityinamonthis5andtheleastis0.TClandsmostinAugustandnoTClandsonChinesecontinentfromDecembertothefollowingApril.TheprimarylandingareaisbetweenShantouandHainanIsland.ThesustainingperiodofTCisusuallybetween4daysto7days,andthelongestis19days.Only15%oftheTCformingintheSouthChinaSeacanintensifytotyphoon,andtheyallformintheoceanareadeeperthan150m.TheSouthChinaSeaistheoceanareaoverwhichtheTCoccursfrequently.

  • 标签: 中国 南海 台风 微波分析
  • 简介:采用Harvard目录中1977-1994年及1960-1993年间的地震有关参数,由Dahlen理论和Lam-beck推出的有关公式估计了地震引起地球轴向惯性矩的累积变化,分析了地震和ElNino事件之间的联系,特别是震级大于5级地地震引起的位错所产生的地球轴向惯性矩的变化会有一个跳跃,这个跳跃的ElNino事件有着很好的对应关系。

  • 标签: 地震 厄尔尼诺事件 位错 地球 轴向惯性矩
  • 简介:Characteristic modemodel of tropical Pacific Ocean and dynamic mechanism of El NinoZhangXiangdong;HuangShisong;andZhangJing(R...

  • 标签: The PACIFIC model EL Nino
  • 简介:Sedimentaryfaciesisanimportantfactorinfluencingshalegasaccumulation.Itnotonlycontrollshydrocarbongeneration,butalsoaffectsreservoircharacteristicsanddistribution.ThispaperdiscussestheLowerSilurianLongmaxiFormationinthesouthoftheSichuanBasin.Outcrop,core,drillingandloggingdataidentifythesedimentaryfaciesoftheformationascontinentalshelffacies,whichisdividedintotwosubfacies:aninnershelfandanoutershelfsubfacies.Thesetwosubfaciescanbefurtherdividedintosevenmicrofacies:muddysiltyshallowshelf,calcareoussiltyshallowshelf,muddylimyshallowshelf,stormflow,muddydeepshelf,siltymuddydeepshelfandcontourcurrentmicrofacies.Verticalandhorizontaldistributionofmicrofaciesestablishesasedimentationmodelofthecontinentalshelffacies.Combinedwithanalizationorcalculationofgeochemical,mineralogical,physicalandgas-bearingpropertiesofsamples,sedimentarymicrofaciesisevaluatedusingnineparameters:totalorganiccarboncontent,effectiveshalecontinuousthickness,vitrinitereflectance,kerogentype,mineralcomponents,porosity,permeability,watersaturationandgascontent.Theevaluationrevealedthatthemostfavorablefaciesforshalegasexplorationanddevelopmentarethemuddydeepshelfandpartofthesiltymuddydeepshelfmicrofacies,withTOCmorethan2%,siliceouscomponentover50%,claylessthan30%,porositymorethan3%,watersaturationlowerthan40%,gascontentgreaterthan2m3/t.Theseresultsprovideatheoreticalbasisfordeciston-makingonthemostpromisingareasforshalegasexplorationintheSichuanBasinandformarineshalegasexplorationanddevelopmentinSouthChina.

  • 标签: 四川盆地 龙马溪组 下志留统 页岩气 沉积相 地层
  • 简介:统计、典型年的作文方法被用来与ElNino和LaNifia事件在关系学习西北太平洋台风活动。结果显示台风趋于在ElNifio年里不活跃并且在拉·尼娜年和它里活跃也依赖于事件的发作和台风的开始的区域。与在频率和海面温度(SST)之间的ElNifio和拉·尼娜年和时间落后关联里的台风活动的频率的统计特征。有用信息被为台风出现的预言提供。另外,单个价值拆卸(SVD)方法被使用学习在重力势领域和SST地之间的关联。结果证明在ElNino年里的由空至海的联合是相反的让台风发展,它与一个更小的数字发生。相反的状况与拉·尼娜年被发现。

  • 标签: TYPHOON EI Nino and La NINA
  • 简介:Basedonaseriesofdataanalyses,theintimaterelationsbetweenanomalouswintermonsooninEastAsiaandElNinoarcstudiedinthispaper.AnomalisticcirculationintheNorthernHemispherecausedbyElNinoeventcanleadtoenhancingtheFerre!cellandthewesterliesinthemid-latitudesastheHadleycellandresultinthelocationofthefrontzoneinEastAsiatothenorth.TheseareunfavourableforthecoldwavebreakingoutsouthwardinEastAsia.Therefore,thereatewarmerweatherandweakerwintermonsooninEastAsiainElNinowinter.TherearestrongerandfrequentcoldwavesinEastAsiaduringthewintertimepriortotheoccurrenceofElNinoevent.TheywillinducestrongerwintermonsooninEastAsia.Thus,theweakenedtradewindandenhancedcumulusconvectionintheequatorialmiddle-westernPacificareacausedbythestrongerwintermonsoonwillplayanimportantroleintheoccurrenceofElNinoevent.Therefore,theanomalouslystrongwintermonsooninEastAsiaduringwinter

  • 标签: WINTER MONSOON ANOMALOUS stronger WEAKENING weakened
  • 简介:Acoupledmodel,whichisemployedtostudythedominatingfactorandkeyareaofElNinocycleformation,consistsofadynamicaloceanmodelandastatisticalatmosphericmodel.ThecoupledmodelwithseasonalforcingsuccessfullyreproducestheElNinoeventcyclewhichexhibitsquasi-regularoscillationswithapreferredperiodofabout4years.Theresultsshowthattheheatcontent(HC)istransportedbetweentheeasternandthewesterntropicalPacificareas.ThespatialdistributionofHCanomaliesforfourphasesofthewholecycleclearlyshowsapossibleformationmechanismofElNino.ExperimentsfurthersuggestthatseasurfacetemperatureinthetropicalPacificandHCinthecentraltropicalPacificarethemostimportantfactorsandthecentraltropicalPacificisthemostimportantareafordeterminingformationofElNinocycle.

  • 标签: COUPLED model EL Nino CYCLE heat
  • 简介:BasedontheSSTandwavedataobservedbyvesselspassingthroughtheNanshaIslandswaters,thispaperanalysesElNinoevent’seffectonhydrologicalfactorsintheabovewaters.Thepaperconcludes(1)SSTintheNanshaIslandswatervarieswiththatoftheEasternEquatorialPacificOceaninsynchronousphase,butvarieswiththatoftheWesternEquatorialPacificOceaninoppositephase;(2)theseastateinNanshaIslandswatersisrough,thefrequencyofgreatwaveincreasesintheyearofElNino,especiallyinthenextyearoftheyearofElNino.Thepaperdiscussesthereasonsfortheabovephenomena.

  • 标签: EL Nino SST WAVE Nansha Isknd
  • 简介:使用每月的风和海面温度(SST)数据,在印度洋与印度洋偶极子模式(IOD)事件联系的南部的南方的大气循环房间第一次被描述并且检验。分叉的风和压力vertical速度为大气循环房间的鉴定被采用。在积极IOD事件的四个不同阶段期间,在西方的印度洋上的异常南方的哈德利发行量证明空气在更低的对流层在热带,在上面的对流层的流动杆病房,在画热带的水池,和回来升起回到热带。在东方印度洋上的塞诺马劳斯·哈德利循环在西方的印度洋上对那相反。在积极IOD事件期间,当它在西方的印度洋上被加强时,在东方IndianOcean上的南方的哈德利发行量被削弱。在IOD索引和哈德利房间的索引之间的相关分析也证明那,大气循环模式在在记录的时期上的每个IOD事件是明显的。

  • 标签: 印度洋 IOD 表面温度 大气循环