简介：Inthispaper,thesummerclimateof1991istakenasacasetostudytheinfluenceofthetransitionzonemigrationonsummerdroughtinNorthChinabyusingtheregionalclimatemodel(RegCM2).Theresultsshowthatthetransitionzonemigratesinland,thesummermonsoonrainbandof1991alsomovesinland.TheintensiverainbandintheChangjiangRiverValleyduringtheMeiyuperiodmovesnorth.TheprecipitationinNorthChinaincreasesandthesurfaceairtemperaturedecreases.Asaconsequence,itresultsinagoodcirclebetweenecosystemandclimate.Thetransitionzonemigrationchangesfluxtransfersbetweenlandandatmosphere,andexcitessecondarycirculationorcirculationcellsaroundit.Allthosearecloselyrelatedwiththevariationofprecipitation.

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.

简介：Basedonnewmultibeambathymetricdataandabout300kmlongsingleseismicprofiles,threetopographicunitswereidentified:thecanyons,fracturalvalleyandsubmarineterraceonthenorthofChiweiIslandwhereisastructuraltransitionzonebetweenthesoutherntroughandthemiddletrough.TheChiweiCanyonandtheNorthChiweiCanyonaretwoofthelargestcanyonsintheEastChinaSea(ECS)slope.Topographicfeaturesandarchitecturesofthemaredescribed.Thestudyshowsthatbothofthemareoriginatedalongfaults.TheevolutionandspatialdistributionoftopographicunitsinthestudyareaarecontrolledmainlybythreegroupsoffaultswhichwereformedandreactiveintherecentextensionalphaseofOkinawaTrough.TheChiweiCanyonwasinitiatedduringthemiddlePleistoceneandguidedbyF4thatisaN-StrendingfaultontheslopeandF1,alargeNW-SEtrendingfaultonthetrough.ThepathwaymigrationfromtheremnantchanneltothepresentoneofChiweiCanyonistheresultofupliftoftiltedfaultblockthatiscoupledtotherecentextensionmovementsofthesoutherntrough.ThesubmarineterraceisdetachedfromtheECSslopebytheNEE-trendingfault.TheNorthChiweiCanyon,developingduringthelatePleistocene,isguidedbyF5,aN-Strendingfault,divertedandblockedbythesubmarineterrace.

简介：从在诺思中国上的2010-14的严重天气报告和合成雷达反射率数据被用来分析严重的对流的风(SCW)的分发事件和他们雷达反射率的组织上的模式。为SCW事件的六个组织上的模式(并且他们的比例)簇房间(35.4%)，嚎啕线(18.4%)，非线性形状的系统(17.8%)，破线(11.6%)，单个房间(1.2%)，和弓回应(0.5%)。为嚎啕线和破线的山峰月是6月，而它是为另外的四个模式的7月。SCW事件的最高的数字在山上，它通常与簇房间的瓦解的系统被联系。相反，与线性系统联系的SCW主要在平原上发生了，在车站每年记录了不到一个SCW事件的一般水准的地方。有与非线性形状的系统联系的SCW的高频率的区域也经历了与嚎啕线联系的许多SCW事件。对流可得到的势能的价值，能使沉淀的水，0-3-km砍，并且0-6-km砍，比在山上在平原上是可论证地更大的，它在SCW事件的组织上的模式上有明显的效果。因此，地形学可以是在为在诺思中国上的SCW事件的组织上的模式的一个重要因素。

简介：ＴｈｅｓｕｐｐｏｒｔｉｎｇｃａｐａｂｉｌｉｔｙｏｆｗａｔｅｒａｎｄｌａｎｄｒｅｓｏｕｒｃｅｓｆｏｒｓｕｓｔａｉｎａｂｌｅｉｎｃｒｅａｓｅｏｆｙｉｅｌｄｉｎＮｏｒｔｈＣｈｉｎａＰｌａｉｎＺＨＡＮＧＨｏｎｇｙｅＩｎｓｔｉｔｕｔｅｏｆＧｅｏｇｒａｐｈｙ，...

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简介：IdentificationofkeySSTzonesisessentialinpredictingtheweather/climatesystemsinEastAsia.WiththeSSTdatabytheU.K.MeteorologicalOfficeand40-yeargeopotentialheightandwindfieldsbyNCAR/NCEP,therelationshipbetweentheEastAsiansummermonsoonandnorthPacificSSTAisstudied,whichrevealstheirinteractionsareofinterdecadalvariation.Beforemid-1970's,thenorthPacificSSTAactsuponthesummermonsooninEastAsiathroughagreatcirclewavetrainandresultsinmorerainfallinthesummerofthenorthernpartofChina.After1976,theSSTAweakensthewavetrainandnolongerinfluencestheprecipitationinNorthChinaduetoloosenedlinkswiththeEastAsiansummermonsoon.ItcanbedrawnthatthekeySSTzoneshavingpotentialeffectsontheweather/climatesystemsinEastAsiadonotstayinoneparticularareaoftheoceanbutrathershiftelsewhereasgovernedbytheinterdecadalvariationsoftheair-seainteractions.Itishopedthatthestudywouldhelpshedlightonthepredictionofdrought/floodspansinChina.

简介：AsimulationofclimatechangetrendsoverNorthChinainthepast50yearsandfuture30yearswasperformedwiththeactualgreenhousegasconcentrationandIPCCSRESB2scenarioconcentrationbyIAP/LASGGOALS4.0(GlobalOcean-Atmosphere-Landsystemcoupledmodel),developedbytheStateKeyLaboratoryofNumericalModellingforAtmosphericSciencesandGeophysicalFluidDynamics(LASG),InstituteofAtmosphericPhysics(IAP),ChineseAcademyofSciences(CAS).Inordertovalidatethemodel,themodernclimateduring1951-2000wasfirstsimulatedbytheGOALSmodelwiththeactualgreenhousegasconcentration,andthesimulationresultswerecomparedwithobserveddata.Thesimulationresultsbasicallyreproducethelowertemperaturefromthe1960stomid-19?0sandthewarmingfromthe1980sfortheglobeandNorthernHemisphere,andbettertheimportantcold(1950-1976)andwarm(1977-2000)periodsinthepast50yearsoverNorthChina.Thecorrelationcoefficientis0.34betweensimulationsandobservations(significantatamorethan0.05confidencelevel).TherangeofwintertemperaturedeparturesforNorthChinaisbetweenthosefortheeasternandwesternChina'sMainland.Meanwhile,thesummerprecipitationtrendturningaroundthe1980sisalsosuccessfullysimulated.Theclimatechangetrendsinthefuture30yearsweresimulatedwiththeCO_2concentrationunderIPCCSRES-B2emissionscenario.Theresultsshowthat,inthefuture30years,wintertemperaturewillkeepawarmingtrendinNorthChinaandincreasebyabout2.5℃relativetoclimatemean(1960-1990).Meanwhile,summerprecipitationwillobviouslyincreaseinNorthChinaanddecreaseinSouthChina,displayingasouth-deficit-north-excessivepatternofprecipitation.

简介：是在由三个主要预报中心在西方的诺思太平洋上形成的热带气旋的数字出现在内部年度、内部十的可变性和期刊变化的特征的比较，i.e.China气象学的管理(CMA)，东京(JMA)的地区性的专业化气象学的中心和关岛的联合台风警告中心(JTWC)，有热带气旋(TC)或台风的下列重要的点(1)气候学(TS的紧张上的TC或更强壮)表演

简介：Almosthalfoftheoceanicwatercolumnsexhibitdouble-diffusion.Theimportanceofdouble-diffusioninglobaloceans'saltandheatfluxes,water-massformationandmixing,andcirculationisincreasinglyrecognized.However,suchanimportantphysicalprocessintheoceanhasnotbeenwellstudied.Oneofthereasonsisthedifficultyofparameterizingandquantifyingtheprocesses.Thepaperpresentedhereattemptstoquantifythedouble-diffusivefluxesofsaltandheatintheocean.Previousqualitativeanalysisbyapplyingthewater-massTurnerangle,mTu,totheNorthPacificIntermediateWater(NPIW)layershowedafavorableconditionforsalt-fingeringintheupperNPIWduetotheoverlyingwarm/saltywaterabovethecold/freshNPIWcore,andadoubly-stableconditioninthelowerNPIWwherepotentialtemperaturedecreaseswithdepthwhilesalinityincreases,inducingdoublestratificationwithrespecttobothpotentialtemperatureandsalinity.Thepresentstudygivesaquantitativeestimateofdouble-diffusivefluxesofsaltandheatcontributedbysalt-fingeringintheupperNPIWlayer.

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简介：ThelocationandlateQuaternaryactivityoftheCentral-NorthSegmentoftheTaihangMountainsPiedmontfaultzonehavebeenstudiedbyshallowseismicsurveyandcombineddrillexploration.OurresultsshowthattheBaoding-ShijiazhuangfaultandtheXushuifaultwereactiveinthelatePleistocene,butthesouthXushuifaulthasbeeninactivesincethelatePleistocene.Themaximummagnitudeofpotentialearthquakeofthefaultsis6.0.

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简介：北方大西洋摆动(NAO)是在北半球的气候可变性的领先的模式之一。它清楚地在气象学的变量联系到变化，这被显示出，例如地面温度，在半球的规模。然而，最近的研究表明了NAO空间模式也取决于太阳的强迫。因此，它气象学的变量上的效果必须变化取决于这个因素。而且，它能是阳光通过可变性模式影响气候，是这研究的焦点的一个假设。我们发现在NAO/AO和半球的温度之间的关系变化取决于太阳活动。结果看积极重要关联太阳活动是否仅仅高。另外，结果支持那项太阳活动影响对流的想法在经由同温层的极的旋涡的变化的北半球的球的气候变化。

简介：ＤＩＳＴＲＩＢＵＴＩＯＮＯＦＬＯＷＦＲＥＱＵＥＮＣＹＷＡＶＥＳＩＮＮＯＲＴＨＰＡＣＩＦＩＣＡＮＤＩＮＴＲＡＳＥＡＳＯＮＡＬＡＢＮＯＲＭＡＬＩＴＹＯＦＴＨＥＷＥＳＴＥＲＮＰＡＣＩＦＩＣＳＵＢＴＲＯＰＩＣＡＬＨＩＧＨＬｉＸｉｎｇｌｉａｎｇ（李兴亮）（Ｍｅ...

简介：Lomagundi-Jatuli事件(LJE)是保存13C在在世界范围的Paleoproterozoic碳酸盐的+5和+16之间的carb价值。然而，这些旅行的持续时间，振幅和模式仍然保持糟糕抑制了。在北方中国Craton的2.14-1.83GaHutuo组是一>10km厚火山--沉积顺序，包括>5km在在上被扔的厚保存得很好的碳酸盐--对亚tidal环境潮汐。碳酸盐的152件最不改变的样品的公司同位素、元素的分析揭示了三阶段的13C进化。它以只积极的13Ccarb(+1.3到+3.4)在Dashiling和Qingshicun形成在~上演2.1Ga碳酸盐，从积极价值由转变列在后面到震荡在~的积极、否定的价值3000mWenshan，Hebiancun，Jianancun，和Daguandong形成的厚碳酸盐，并且与只否定的13C保存在的carb价值>500mHuaiyincun和Beidaxing形成的厚dolostones。看来许多LJE，特别地那些极其积极的13Ccarb信号，没在Hutuo碳酸盐被记录。只积极的13Ccarb价值(+1.3到+3.4)多半在更低的形成保存了对应于LJE的目的，而随后二个阶段反映LJE和Shunga-Francevillian事件(SFE)的发作的余殃。现在的数据点到碳上的氧的增加的影响从Doucun骑车到Dongye亚群并且证明在北方中国Craton的LJE的结束与在Fennoscandia和南非的那些是将近同时的。

简介：ThecropmodelWorldFoodStudies(WOFOST)wastunedandvalidatedwithmeteorologicalaswellaswinterwheatgrowthandyielddataat24stationsin5provincesofNorthChinafrom1997to2003.Theparameterizationobtainedbythetuningwasthenusedtomodeltheimpactsofclimatechangeonwinterwheatgrowthforallstationsusinglong-termweatherdatafrom1950to2000.Twosimulationsweremade,onewithallmeteorologicaldata(rainfed)andtheotherwithoutwaterstress(potential).Theresultsindicatethatthefloweringandmaturitydatesoccurred3.3and3daysearlierinthe1990sthanthatinthe1960sduetoa0.65℃temperatureincrease.Thesimulatedrainfedyieldsshowthattheaveragedroughtinducedyields(potentialminusrainfedyields)havedecreasedby9.7%overthelast50years.Thisistobecomparedwitha0.02%decreaseinyieldiftheprecipitationlimitislifted.Althoughtheprecipitationduringthegrowingseasonhasdecreasedoverthelast50years,thedroughteffectsontherainfedyieldsremainedtobepracticallyunchangedasthespringprecipitationdidnotdecreasemarkedly.

简介：Thisstudyfocusesonthedecadalvariabilityoftropicalcyclones(TC)overtheWesternNorthPacific(WNP)andhowthesechangesarerelatedtotheMadden-JulianOscillation(MJO).ItwasdonewiththehelpoftheReal-timeMultivariateMJOindexfromtheAustralianGovernmentBureauofMeteorologyoftheCentreforAustralianWeatherandClimateResearch,TCdatafromtheJointTyphoonWarmingCenterbesttrackdatasets,anddailyandmonthlydatasetsfromtheNCEP/NCARreanalysiscenter.TheresultsshowthattheTCfrequencyintheWNPexhibitedastatisticallysignificantdecreaseduring1998-2010comparedtoduring1979-1997.ThedecreaseinTCfrequencyintheWNPmainlyoccurredduringMJOactivephases(i.e.,phases4,5,6,and7).FurtherinvestigationoftheclimatebackgroundandthepropagationdifferencesoftheMJObetween1979-1997and1998-2010wasperformed.TheLaNina-liketropicalseasurfacetemperaturecoolingcausedstrongerWalkercirculationandthusinducedunfavorableatmosphereconditionsforWNPTCgenesisincludingalow-leveleasterlyanomaly,anegativerelativevorticityanomaly,anincreaseinsea-levelpressure,andstrongerverticalwindshear.Moreover,shorteningoftheMJOcycle,declineinthedurationoftheactivephasesintheWNP,andeasterlyanomalyandshrinkageoftheconvectionareaduringMJOactivephasesmayalsopartlyexplainthedecadalvariationofTC.

简介：PrecipitationobservationscollectedatweatherstationsineasternChina,theNCEP/NCARreanalysisdata,thetropicalcyclone(TC)BestTrackDataset,andasensitivitynumericalexperimentwereusedinthepresentstudytoinvestigatetheroleintheEastAsiansummermonsoon(EASM)systemplayedbyfrequentTCactivitiesoverthewesternNorthPacific(WNP).Resultsindicatedthat,inactiveTCyears,theEASMisstrongerandthesoutherlywindsinthelowertroposphereadvancefarthernorthandreachhigherlatitudes.Meanwhile,themonsoonrainbeltremainsinthelowerandmiddlereachesoftheYangtzeRivervalleyforarelativelyshortperiod,leadingtolessprecipitationthere.BoththewesternPacificsubtropicalhighandtheSouthAsianhighweakenwiththenorthwardshiftoftheridgelinesforbothhigh-pressuresystemsaswellastheEastAsiansubtropicalupper-leveljet.Therefore,theimpactsoffrequentTCactivitiesovertheWNPoneachindividualcomponentoftheEASMareinphasewiththoseofthestrongerEASMitself,amplifyingfeaturesofthealreadystrengthenedEASM.