学科分类
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39 个结果
  • 简介:这篇文章讨论北方大西洋摆动(NAO)和诺思太平洋摆动(NPO)的interannual变化,它与在与气候被联系的中国的interdecadal气候变化的关系在1960鈥檚在北半球跳,用数据分析。两个都,NAO和NPO的振幅在1960鈥檚显然增加,这清楚地被显示出,摆动的主要时期在1960鈥檚前从3-4年改变到8鈥?在1960鈥檚以后的5年。因此,在中国的interdecadal气候变化或气候在1960鈥檚跳仔细与NAO和NPO的异例有关。关键词诺思大西洋摆动(NAO)-诺思太平洋摆动(NPO)-气候跳-Interdecadal气候变化这个工作被国家关键基本科学节目在中国(G1998040903)支持,科学的中国学院和中国(资助No.49823002)的国家自然科学Fundation。作者对为打手稿的王璇女士也感激。

  • 标签: NORTH Atlantic OSCILLATION (NAO). NORTH Pacific
  • 简介:ThecharacteristicsandpossiblephysicalmechanismofinterdecadalvariationoftheintensityoftheSouthAsianHigh(SAH)insummerareanalyzedusingtheNCEP/NCARreanalysisdataandNOAAextendedreconstructedseasurfacetemperature(SST)data.Theresultsindicatethataremarkableinterdecadaltransitionoccurredinthelate1970sthatincreasedtheintensityofSAH,or,anabruptclimatechangewasaround1978.AcomparativeanalysisbetweentheweakandstrongperiodoftheSAHintensityshowsthattherelatedanomalouspatternsoftheatmosphericcirculation(includingwindfield,airtemperaturefieldandverticalvelocityfield)arenearlyoppositetoeachother.Thesurfacelatentheatfluxanomaliesovertheplateau(especiallyinthenorthwestoftheplateau)insummerexertgreatinfluenceontheinterdecadalvariationoftheSAHintensityandthesurfacesensibleheatfluxanomaliesplayamoreimportantrole.ConsistentwiththeinterdecadalvariationoftheSAHintensity,themonopolemodeofthetropicalIndianOceanSSTinsummeralsoexperiencedalowtohightransitioninthelate1970s.Tosomeextent,thiscanrevealtheimpactoftheanomalousmonopolemodeofthetropicalIndianOceanSSTinsummeroninterdecadalvariationoftheSAH.

  • 标签: South Asian High interdecadal variation atmospheric circulation surface heat flux sea surface temperature
  • 简介:A6-layer,4°×5°horizontalresolutionglobaloceanmodelhasbeendesignedandimproved.Aftera100-yearin-tegration,anequilibriumstatehasbeenreachedfromtheuppertolowerlayers.Bytakingthemeanstateoflastl0mod-elyearsasclimaticstate,weanalyzedthecharacteristicsoftheseasonalvariationinourmodelintegration.Theresultsshowthatthesimulatedseasonalvariationissimilartotheobserved.Sothedesignofourmodelissuccessful.Then,us-ingthesimulatedclimaticstateoftheseasonalvariationastheinitialstate,andtheobservedstressandthermalstateastheatmosphericforcing,wesimulatedtheprocessofElNinoin1972—1973successfully.Thesimulatedresultsofsea-sonalvariationusingourmodelwillbepresentedinpartI.

  • 标签: OCEAN MODELLING SEASONAL VARIATION of OCEAN
  • 简介:ByusingtheobservationalO3dataofKunmingandHongKongduringtheperiodof1997-2001,thepaperstudiesthedistributionandvariationoftotalozoneinlowlatituderegionofChina.ThestudyshowsthatthecharacteristicsofvariationinKunmingandHongKongareverysimilar,andthetotalozoneinthewesternareasislargerthanintheeasternones.Itismaximuminsummerandminimuminwinter.

  • 标签: 臭氧层 低纬度 变化特征 南极大陆
  • 简介:ModellingtheInterannualVariationofRegionalPrecipitation over ChinaWangHuijum(王会军)(LASG,InstituteofAtmosphericPhysics,ChineseA...

  • 标签: INTERANNUAL VARIABILITY Correlation Numerical CLIMATE prediction
  • 简介:广州春天降雨主要展出内部年变化30年的ofQuasi每年两次、内部的十的变化,并且在时间放大的弱降雨atinterdecadal的时期。Nino3的SST异例(SSTA)是Guangzhouspring降雨的最强壮的先锋。他们从以前的11月有重要积极关联并且稳定地坚持到4月。在以前的冬季的Nino3SSTA在春天通过NorthPacific副热带的高、低的风影响广州春天降雨。当Nino3SSTA在以前的冬季是积极的时,跳副热带的高度是强烈的,向西,华南位于在搬运到华南的副热带的高度,和水汽的边登上气流的区域被反气旋循环加强到菲律宾的东方。广州春天降雨因此是重的。当Nino3SSTA是否定的时,副热带的高度弱、东方,华南从副热带的高度是遥远的并且位于下气流的区域,并且因为低级气旋的循环控制区域到菲律宾的东方,北方风在华南占优势,搬运到华南的水汽是弱的。广州春天降雨因此是弱的,春天干旱被结果。

  • 标签: 广州春季降雨量 春旱 前兆 亚热带高压 低水平风
  • 简介:A2-Dglobalchemistry-transportmodelissetupinthispaper.Themodelsimulatestheatmosphericozonedistributionswellwithspecifieddynamicalconditions.Theanalysisofozonevariationmechanismshowsthatozoneischemicallyinquasi-equilibriumexceptforthepolarnightregionwherethevariationofozoneconcentrationisunderthecontrolofdynamicalprocesses,thattheoxygenatomswhichproduceozonearemainlyprovidedbythephotolysisofO2intheupperstratosphereandbythephotolysisofNO2inthelowerstratosphereandthetroposphere.andthattheozoneisdestroyedmainlybyNOx:thereactionsbetweenNOxandO3andtheoddoxygencyclecontribute80%tomorethan90%oftheozonedestruction.

  • 标签: OZONE OZONE VARIATION NUMERICAL simulation
  • 简介:从NCEP和OLR数据的850hPa风地数据被用来在华南海和他们的相互的关系学习西南的风和OLR的变化行为。一个季风索引被提出那在这个区域反映蜗季风的变化。在紧张变化的初步的学习和季风的建立时间,双山峰双山峰,这被发现并且内部季风紧张和建立时间的年变化与海面温度被联系。夏季风在ElNino年里并且反过来也如此更早并且与更高的紧张被建立。

  • 标签: summer MONSOON ESTABLISHMENT INTENSITY SOUTH China
  • 简介:THEVARIATIONFEATURESOFAGROCLIMATICRESOURCESANDCROPYIELDOFCHINAINRECENT40YEARSGaoSuhua(高素华)andZhangYu(张宇)ResearchCenterforAgri...

  • 标签: agroclimatic RESOURCES CROP YIELD CLIMATIC change
  • 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。

  • 标签: 西太平洋亚热带高压 位置变化 视在加热 WPSH
  • 简介:SpatialandtemporaldistributioncharacteristicsandscalerangeoftwosignificantareaswereobtainedbyanalyzingtherelationshipamongsummerrainfallinYunnanprovince,heightfieldandSSTfield(40°S-40°N,30°E-70°W)acrosstheNorthHemisphereat200hPa,500hPaand850hPaforJan.toMayandcorrelation,andfieldwavestructure.RemotekeyregionsamongsummerrainfallinYunnanprovince,heightfieldandSSTfield(40°S-40°N,30°E-70°W)acrosstheNorthHemisphereat200hPa,500hPaand850hPawerestudiedthroughfurtheranalyzingofthecirculationsystemanditsclimate/weathersignificance.TheresultshowsthattheforecasthasdependablephysicalbasiswhenheightandSSTfieldswereviewedaspredictorsandphysicalmodelsofimpactsonrainyseasonprecipitationinYunnanarepreliminarilyconcluded.

  • 标签: 云南 降雨量 雨季 天气预报 循环模式 地表分布
  • 简介:BytheutilizationofmonthlyprecipitationdatafromallstationsintheNorthernHemisphereannexedtothe"WorldSurveyofclimatology,Vol.1-15",thedistributionsofthemaximumprecipitationmonths(MPM),theannualrelativeprecipitation(ARP)andthemonthlyrelativeprecipitation(percentofannual)inJanuaryandJulyarerespectivelymapped.MoreoverthedistributionsofintermonthlyrelativeprecipitationvariabilitiesfromJanuarytoDecemberareplottedaswell.Fromthesefigures,theprecipitationintheNorthernHemispheremaybeclassifiedintothreetypes(continental,oceanicandtransitionaltypes)and17regions.Theprecipitationregimemayalsobedividedintotwopatterns,theglobalandregionalpatterns.TheglobalpatternconsistsofplanetaryfrontsystemandITCZanditsinter-monthlyvariationshowsthenorth-and-southshiftoftherainbelt;theregionalpatternconsistsofthesea-landmonsoonandplateaumonsoonregime,inwhichtheinter-monthlyvariationofrainbelt

  • 标签: PRECIPITATION MONSOON winter PLATEAU latitude north
  • 简介:Bymeansofsimulationexperimentswithatwo-dimensionalzonal-meanmodel,astudyismadeoftheinfluenceofthewesternNorth-Pacificmidlatitudesea-surfacetemperature(SST)anomaliesonthecirculationpatternandwet-seasonalprecipitationovertheEast-ChinaChangjiang-HuaihereachesandtheNorth-Chinaplain.TheSSTanomaliesaredividedintotwotypes,onebeing“colderinthesouthandwarmerinthenorth”andtheotherjustopposite,dependingonseason.Resultsshowthattheoccurrenceoftheanomaliesisfollowedbyconsiderablechangesinthepositionofthesubtropicalhighhappeningfor3-5monthstocome.Forinstance,thespring“colderinthesouthandwarmerinthenorth”anomaloustype(i.e.,colderfor20—35°N,andwarmernorthof35°N)leadstotheintensificationofthesummersubtropicalhigh,withtheridgelinemovedslightlynorthward,resultingindroughtoverChangjiangreachesforJuly-AugustandinexcessiverainfallintheNorth-Chinaplain,andviceversa.

  • 标签: seasonal NORTHWARD ANOMALOUS SUBTROPICAL drought rainfall
  • 简介:韦伯斯特和杨季风索引(WYI)—在第850a200hPa之间的带的风切变根据NCEP/NCAR分析数据计算、修改。在分析150-100和200hPa的发行量和分叉地以后,然而,我们发现200-hPalevel不能反映亚洲夏季风,特别特征和变化的upper-tropospheric发行量的真实变化热带在东方是upper-tropospheric发行量的最重要的特征的喷气。比U_(850)-U_(200),并且这样大的带的风切变U_(850)-U_((150+100))is大部分它能更适当地反映季风的力量。另外,分叉在150hPa而非200hPa是最大的,因此在上面对流层的罐头的150hPa反映联合季风系统。因此,WYI是重新定义的asDHI,即,I_(DH)=U_(850)~*-U_((150+100))~*,它能在亚洲描绘带的风切变的中心的紧张的可变性不仅,而且在上面、更低的对流层的季风系统。DHI比在展示它在那里显示的Asiansummer季风的长期的变化的WYI优异是明显的内部在亚洲夏季风和气候的十的变化突然的变化发生在1980。亚洲夏季风在第1980a前是更强壮的它由于变弱在然后以后变弱在150-100hPa的层在东方,当时在200hPa在东方没显著地变弱。在气候以后跳年一般来说,在在亚洲削弱的上面的对流层在东方,显示变弱夏季风;land-seapressure差别和热差别减少了,导致变弱季风;相应上面的分叉以及水汽运输在印度半岛,中央印度支那半岛,诺思中国,和东北中国减少了,显示也变弱夏季风。在学习茶碱紧张和亚洲夏季风的长期的变化的NCEP/NCAR和ERA-40分析数据之间的差别也为参考最后被比较。

  • 标签: 季风 气候变换 亚洲 夏季
  • 简介:以便在Leizhou半岛上在雷雨的发展频率上研究植物分发的调整的可能的影响,数学统计方法包括关联分析,11种恰当的模型和所有变量回归方法,被用于分析和研究。年度雷雨天的数字的平均趋势显然正在下,并且在所有季节,温暖的正午以后的雷雨在收起大多数部分有雷雨的结果表演,和高频率从5月被发现到9月,并且雷雨的开始并且结束的日期有大年度差异。植被结构与稻田的减小和甘蔗并且水果种的区域增长一起被改进了,它导致雷雨天的数字的减少;在冬季的特征的变化业余领域,被种蔬菜引起,在早冬季和迟了的春天限制雷雨的形成。同时,花生种的区域调整几乎没在雷雨天的变化上有小影响。主要庄稼分发的调整例如米饭,甘蔗,水果和蔬菜,可以在雷雨的形成上有明显的影响,并且甘蔗有最大的效果,由米饭,蔬菜和水果接着列在后面,并且庄稼分发的调整几乎没在雷雨的开始并且结束的日期上有小影响。

  • 标签: 作物分布 频率变化 雷州半岛 雷暴 调整 水果种植
  • 简介:Weanalyzethedecadalvariationofthestratospheretropospherecoupledsystemaroundtheyear2000byusingtheNCEPreanalysis-2data.Specifically,therelationshipbetweentheNorthernHemisphereAnnularMode(NAM)andthetroposphericEastAsiantroughisinvestigatedinordertofindtheeffectivestratosphericsignalsduringcoldairoutbreaksinChina.Statisticalanalysesanddynamicdiagnosesbothindicatethatafter2000,increasedstratosphericpolarvortexdisturbancesoccurandtheNAMismainlyinnegativephase.Thetroposphericpolarareasaredirectlyaffectedbythepolarvortex,andinthemidlatitudes,theUralblockinghighandEastAsiantrougharemoreactive,whichleadtoenhancedcoldairactivitiesineasternandnorthernChina.Furtherinvestigationrevealsthatunderthiscirculationpattern,downwardpropagationsofnegativeNAMindexarecloselyrelatedtotheintensityvariationoftheEastAsiantrough.WhennegativeNAManomaliespropagatedowntotheuppertroposphereandreachacertainintensity(standardizedNAMindexlessthan1),theyresultinapparentreinforcementoftheEastAsiantrough,whichreachesitsmaximumintensityaboutoneweeklater.Thenortherlywindbehindthetroughtransportscoldairsouthwardandeastward,andtherangeofinfluenceandtheintensityarecloselyassociatedwiththetroughlocation.Therefore,theNAMindexcanbeusedasameasureofthesignalsfromthedisturbedstratospheretogivesomeindicationofcoldairactivitiesinChina.

  • 标签: 东亚大槽 年代际变化 北半球 环状 冷空气活动 强度变化
  • 简介:Theinfluenceoftheinterannualvariationofcross-equatorialflow(CEF)ontropicalcyclogenesisoverthewesternNorthPacific(WNP)isexaminedinthispaperbyusingthetropicalcyclone(TC)besttrackdatafromtheJointTyphoonWarningCenterandtheJRA-25reanalysisdataset.TheresultsshowedthatthenumberofTCsformingtotheeastof140°EoverthesoutheasternpartofthewesternNorthPacific(WNP)isinhighlypositivecorrelationwiththevariationoftheCEFnear125°Eand150°E,i.e.,thenumberoftropicalcyclogenesesincreaseswhenthecross-equatorialflowsarestrong.CompositeanalysesshowedthatduringtheyearsofstrongCEF,thevariationsofOLR,verticalwindshearbetween200-850hPa,850hParelativevorticityand200hPadivergencearefavorablefortropicalcyclogenesistotheeastof140°EoverthetropicalWNP,andviceversa.Moreover,itisalsodiscussedfromtheviewofbarotropicenergyconversionthatduringtheyearsofstrongCEF,aneastward-extendedmonsoontroughleadstotherapidgrowthofeddykineticenergyovertheeasternpartofWNP,whichisfavorablefortropicalcyclogenesis;butduringtheyearsofweakCEF,themonsoontroughislocatedwestwardinthewesternpartoftheWNP,consistentwiththegrowthareaofeddykineticenergy.Asaresult,therearefewerTCgenesesovertheeasternpartofWNP.Besides,theabruptstrengtheningofaclose-byCEF2-4daysbeforetropicalcyclogenesismaybetheoneofitstriggers.

  • 标签:
  • 简介:降水的变化特征在冬季期间(在10月和下列三月之间,此后被叫作“就冬季”)在广东省在过去的50年期间(从1957~2006)并且与和平的SST的关系用实验直角的功能(文件结束)分析,小浪分析,和关联分析的方法被学习。结果证明广东降水在冬季期间展出40年和2年的伪周期的重要摆动;降雨比从1970年代中是从到1970年代并且从到礼品的1990年代的结束的开始的1950年代的结束的更少到1990年代中。持续干旱的频率多于在冬季期间泛滥支撑。广东降水在期间这次时期在到赤道的中央、东方的和平的SST的显著地积极的关联,但是在与菲律宾的海的西方、北的和平的SST东方的显著地否定的关联。61.5%持续干旱发生在Ni(n)o3.4索引的否定异例的阶段并且38.5%在积极的阶段。大气的循环的合成分析为与持续干旱联系的Ni(n)o3.4区域的积极、否定的阶段被执行。结果证明一个弱极的旋涡,在欧洲的强壮的马槽和一条山脉接近巴尔克哈什·莱克,活跃冷空气和在底层控制广东的一致的在北方的风异例,在亚洲大陆的低中间的纬度的不活跃的西的低骚乱,并且一个弱南部的分支西的马槽,都是为持续干旱的相互的原因。

  • 标签: 持续干旱 广东省 冬季 原因 降水 作者
  • 简介:ATibetanozonelowwasfoundinthe1990saftertheAntarcticozonehole.Whetherthisozonelowhasbeenrecoveringfromthebeginningofthe2000sfollowingtheglobalozonerecoveryisanintriguingtopic.WiththemostrecentmergedTOMS/SBUV(TotalOzoneMappingSpectrometer/SolarBackscatterUltraViolet)ozonedata,theTibetanozonelowanditslong-termvariationduring1979-2010areanalyzedusingastatisticalregressionmodelthatincludestheseasonalcycle,solarcycle,quasi-biennialoscillation(QBO),ENSOsignal,andtrends.TheresultsshowthattheTibetanozonelowmaintainsandmaybecomemoresevereonaverageduring1979-2010,comparedwithitsmeanstateintheperiodsbefore2000,possiblycausedbythestrongerdownwardtrendoftotalozoneconcentrationovertheTibet.Comparedwiththeozonevariationoverthenon-Tibetanregionalongthesamelatitudes,theTibetanozonehasalargerdownwardtrendduring1979-2010,withamaximumvalueof-0.40±0.10DUyr1inJanuary,whichsuggeststhestrengtheningoftheTibetanozonelowincontrasttotherecoveryofglobalozone.RegressionanalysesshowthattheQBOsignalplaysanimportantroleindeterminingthetotalozonevariationovertheTibet.Inaddition,thelong-termozonevariationovertheTibetanregionislargelyaffectedbythethermal-dynamicalproxiessuchasthelowerstratospherictemperature,withitscontributionreachingaround10%ofthetotalozonechange,whichisgreatlydifferentfromthatoverthenon-Tibetanregion.

  • 标签: 南极臭氧洞 西藏 长期变化 统计回归模型 藏族地区 臭氧总量
  • 简介:这研究在东北亚洲(NEA)和它的联系发行量异例上调查夏天表面空气温度的interannual变化。为在NEA上的温度可变性的二个领先的模式被文件结束分析获得。第一个文件结束模式被一个同类的温度异例在NEA上描绘因此被称为NEA模式。这个异例从湖贝加尔湖的东南延长到日本,与在东北中国的一个中央区域。第二个文件结束模式被一个跷跷板模式描绘,显示出在东亚之间的形成对照的分布(明确地在东北中国,朝鲜,和日本包括Changbai山)并且这个区域的北方。这个模式被称为东亚(EA)模式。两个模式在EA.The相等地作出贡献到温度可变性二个领先的模式与不同发行量异例被联系。一个温暖的NEA模式在NEA上并且这样与一个积极geopotential高度异例被联系削弱的upper-tropospheric西的喷气。在另一方面,一个温暖的EA模式与在EA和一口向北方代替的喷气上的一个积极高度异例有关。另外,NEA模式趋于与欧亚的teleconnection模式有关,当EA模式与东方Asia-Pacific/Pacific-Japan模式被联系时。

  • 标签: 东北亚地区 环流异常 夏季气温 中国东北地区 NEA 温度变化