简介：Basedonthedataoftemperatureandsalinityofthe137°Esectioninthewintersandsummersfrom1967to1995,thegeo-strophiccurrentofthesectioniscalculatedandanalyzed,andthedriftingtracksofthesatellitetrackingdriftbuoydistributedonthe144°Esectionarealsoanalyzed.InlightofthesurfacedynamicheightdistributionintheCSKatlas,thispapercomparessomefeaturesoftheSubtropicalCountercurrent,theNorthEquatorialCurrentandtheNorthEquatorialCountercurrent.Themainresultsareasfollows:1.TheSubtropicalCountercurrent,theNorthEquatorialCurrentandtheNorthEquatorialCountercurrentarenotsimplesinglecurrents,buthavetwobranchesormore.Oneofthecommonfeaturesofthethreecurrentsmentionedaboveis"multi-branching"ofthecurrent.2.Thezonaldistributionoftheflowvelocitystructure,thealternateandintermittentoccurrenceoftheeastwardandwestwardflows,withashallowerflowlayerandbelongingtothesurfacefloworsubsurfacef

简介：UsingaDMT(DropletMeasurementTechnologies)continuousflowstreamwisethermalgradientcloudcondensationnuclei(CCN)countermountedonaCheyenneⅢAaircraft,about20flightsforaircraftmea-surementsofCCNoverNorthChinawereconductedintheautumnof2005andspringof2006.Accordingtothedesignforaircraftobservation,themethodofspiralascentordescentinthetropospherewasusedfortheverticalmeasurementofCCN,andsomecertainlevelswerechosenforhorizontalmeasurement.TheverticaldistributionsofCCNconcentrationsshowthatmostCCNparticlesareconcentratedinthelowleveloftroposphereandCCNconcentrationdecreasedwithheightincreasing.ItsuggeststhatthemainsourceofCCNisfromthesurface.Thisresultisconsistentwithformerstudiesduring1983-1985inChinawithastaticthermalgradientCCNcounter.ThecomparisonofverticalobservationsbetweenpollutedruralareanearShijiazhuangandnon-pollutedruralareanearZhangjiakoushowsthatthereisaboutfivetimesdifferenceinCCNconcentration.Butovertwopollutedcities,ShijiazhuangandHandan,thereisnonotabledifferenceinCCNconcentration.ThehorizontalflightmeasurementsforpenetratingthecumuluscloudsexperimentshowtheapparentdecreaseofCCNinclouds.ItconfirmsthatcloudhasadefiniteconsumptiveeffectonCCNparticlesbecausesomeCCNparticlescanformclouddroplets.ThesurfacemeasurementsofCCNinShijiazhuangCityweremadeduringJune-August2005.Thesta-tisticalCCNdatashowthegreatdifferenceinconcentrationatthesamesupersaturation(S)inShijiazhuangsummertime.TheminimumCCNconcentrationswere584,808,and2431cm~(-3),andthemaximumconcen-trationswere9495,16332,and21812cm~(-3)atS=0.1%,0.3%,and0.5%,respectively.CCNhasadiurnalvariationcycle.From0600BT,theconcentrationbegantoincreaseandreachedthemaximumataboutnoon.Thenitgenerallydecreasedthroughouttheafternoon.Thereasonmaybeisrelatedtotheonsetofemissionsfromvehiculartraffi

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简介：TheFirstInternationalConferenceonGeoparkswasheldinBeijing,ChinainJune2004.AtthatconferencewewereimmersedintheUNESCOconceptofGeoparksforthefirsttime,AsNorthAmericans,wetakeforgrantednational.provincialandstateparkswhicharescatteredthroughoutthecontinentandproviderecreationalandeducationalopportunities.

简介：数字建模具有在理解地区性的地下水系统的行为的关键重要性。然而，当在长时间跨度上执行高分辨率的模拟时，为能力建模上的需求是集中的。这份报纸论述一个平行程序的应用程序加快在诺思中国平原地下水流动系统当模特儿详细说明。平行程序被在我们的并行计算的框架上重建著名MODFLOW程序实现，它被设计基于补丁的平行数据结构和算法，但是维持compute流动和MODFLOW的功能完成。有超过100万个格子和时间的一十年的详细模型被解决了。平行模拟结果对观察数据和这二个数据通常在好同意的地被检验。为在答案时间的比较，在32个核心上跑的平行程序比最快的基于MICCG的MODFLOW程序快6倍、比基于GMG的MODFLOW程序快11倍。因此，当使用平行程序时，显著计算时间能被节省，它便于在北方中国平原的快速的建模和地下水流动系统的预言。

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简介：ThecircumfluencearoundtheJiuduanSandbankisthoroughlystudiedbymeansoftheprinci-pleofleastresistanceinfluiddynamics.ThediversionratiooftheNorthChannelfor1998iscalculated,whichisalmostthesameasthefieldsurveydata.ThenormalandminimumdiversionratiosoftheNorthChannelafterstagesⅠ,ⅡandⅢregulationworksaswellasthefuturephaseareobtained.Thenumeri-calresultsandpredictedvalueareaccurate.

简介：Inthispaper,theSpaceWeatherModelingFramework(SWMF)isusedtosimulatethereal-timeresponseofthemagnetospheretoasolarwindeventonJune5,1998,inwhichtheinterplanetarymagneticfieldshifteditsdirectionfromnorthtosouth.Sincemostcurrentmodelsdonottakeintoaccountconvectiveeffectsoftheinnermagnetosphere,wefirststudytheimportanceofRiceConvectionModel(RCM)intheglobalmodel.Wethenfocusonthefollowingfouraspectsofthemagnetosphere’sresponse:themagnetosphere’sdensitydistribution,thestructureofitsmagneticfieldlines,theareaofthepolarcapboundary,andthecorrespondingionosphericcurrentchange.Wefindthat(1)whentheIMFchangesfromnorthtosouthinthisevent,highmagnetosheathdensityisobservedtoflowdownstreamalongthemagnetopausewiththesolarwind;low-latitudereconnectionatdaysideoccursunderthesouthwardIMF,whilethemagneticfieldlinesinthetaillobecaudal,causedbythenightsidehighlatitudereconnection,extendintotheinterplanetaryspace.Openmagneticfieldlinesexistsimultaneouslyatbothhighandlowlatitudesatthemagnetopause;(2)theareaofthepolarcapisobviouslyincreasediftheIMFturnsfromthenorthtothesouth;thisobservationishighlyconsistentwithempiricalobservations;(3)theionosphericfieldaligncurrentinthenorthernhemisphereisstrongerthaninthesouthernhemisphereandalsoincreasesastheIMFchangesfromnorthtosouth.SWMFwiththeRiceConvectioneffectprovidesreliablemodelingofthemagnetosphericandionosphericresponsetothissolarwindvariation.

简介：ＩＮＴＲＯＤＵＣＴＩＯＮＮｏｒｔｈＱｉｌｉａｎＭｏｕｎｔａｉｎｓｈａｓｕｎｄｅｒｇｏｎｅｔｈｒｅｅｋｉｎｄｓｏｆｔｅｃ－ｔｏｎｉｃｓｙｓｔｅｍｓｓｉｎｃｅＰｒｏｔｅｒｏｚｏｉｃ，ｎａｍｅｌｙｃｏｎｔｉｎｅｎｔａｌｒｉｆｔ，ｐｌａｔｅｔｅｃｔｏｎｉｃａ...

简介：直接暴露于日光的方面上的树通常变得比在相反的方面上快，现象称为植物向光性。在situ有在Yanqing县的Xiadelongwan区域的硅化的木头的垂直箱子，北方北京，在自从2002，中国的石化的伍德的第一个国家地质的公园被造了的地方。一些箱子有保存得很好的生长戒指。一个人石化从形成的树桩显示出SW230°的一个积极向光性方向。作为与现代正常相比，生长走在北京平凡区域，它有SW210°±的一个积极向光性方向5°，木头向光性的证据支持自从迟了的侏罗记，北方中国板顺时针方向旋转了的以前的palaeomagnetic研究的结论。在Yanshan辽宁区域的已知的石化的木头树桩主要从165-136妈的阶层被发现，它对应于Yanshanian运动的主要阶段。

简介：ＴＨＥＳＩＭＵＬＡＴＩＯＮＯＦＡＳＰＲＩＮＧＰＲＥＣＩＰＩＴＡＴＩＯＮＰＲＯＣＥＳＳＦＯＲＩＣＥＳＥＥＤＩＮＧＩＮＮＯＲＴＨＣＨＩＮＡＷａｎｓＸｉａｏｂｉｎ（汪晓滨），ＨｕＺｈｉｊｎ（胡志晋）ａｎｄＹｏｕＬａｉｇｕａｎｇ（游来光）（Ｉｎｓｔｉｔｕｔｅ...

简介：TheNorthChinablock,thewesternportionoftheSino-KoreanCraton,isroundedbyYanshanianinthenorthandQinling-Dabieorogenicbeltsinthesouth.Thewidespreaddevelopmentofextensionalbasinsinthisblockindicateshorizontalextensionorcontinuedthinningofapreviouselythickened,trnstablelithospherethroughouttheMesozoic.Inthispaper,weattempttosimulatenumericallythegeodynamicalprocessofthebasinformationbyusingthemountain-basinevolutionsystem.WeassumethattheformationofnumeroussedimentarybasinsintheNorthChinablockistheresultofthecrustalextension,whichdestructsrapidlythepreviouslythickenedcrust.

简介：Althoughseismicgaptheoryplaysanimportantroleinthemed-andlong-termearthquakeprediction,thepotentialriskofthenon-seismicgapinhistoricalearthquakeruptureareaswillneedtobesimultaneouslytakenintoaccountinthestudyofmed-andlong-termearthquakeprediction,duetothetemporallyclusteringornon-linearbehavioroflargeearthquakerecurrence.Inordertoexploretechnicalmethodswhichcanbebasedonobservationaldata,andidentifyhistoricalearthquakerupturezones(includingtheseismicgapinhistoricalandprehistoricearthquakerupturezones),weselecteighthistoricallargeearthquakerupturezoneswithdifferentelapsedtimesonthemid-northsegmentoftheNorth-SouthSeismicBelttomakequantitativeanalysisonthecharacteristicsofmodernseismicityofthesezonesandpreliminarilyexploretheseismicitymethodfordeterminingtheurgencydegreeofpotentialearthquakehazards.Theresultsmainlyshowthatthepvalue,whichreflectstheattenuationofearthquakesequence,andthea-value,whichreflectstheseismicityrate,arestronglyrelatedtotheelapsedtimeofthelatestearthquakeintherupturezone.However,thecorrespondingrelationshipsinsomeruptureareasarenotclearperhapsduetothecomplexfaultstructureandfaultingbehavior.Theb-value,whichrepresentsthestateoftectonicstressaccumulation,doesnoteasilyreflecttheelapsedtimeinformationofdifferentevolutionstages.Theb-valuetemporalscanningshowsasteadyevolutionovertimeinmostoftherupturezones,butintherupturezoneoftheWuduM8.0earthquakeof1879,theb-valueshowssignificantfluctuationswithadecreasingtrendfor20years.Bycomparativeanalysis,weconcludethattherupturezonesofthe1933M7.5Maoxianearthquakeandthe1976M7.2Songpan-Pingwuearthquakearestillinthedecayingperiodofearthquakesequences,andthusdonothavethebackgroundforrecurrenceofM7.0earthquakes.Thelowb-valueMaqusegment,whichislocatedatthenorthmarginoftherupturezoneof

简介：ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｐａｌｅｏｃｏｎｔｉｎｅｎｔａｌｍａｒｇｉｎｓ，ｃｈａｒａｃｔｅｒｉｚｅｄｂｙａｃｔｉｖｅｉｎ－ｔｅｒａｃｔｉｏｎｂｅｔｗｅｅｎｅａｒｔｈｃｒｕｓｔａｎｄｍａｎｔｌｅ，ｃｏｍｐｌｉｃａｔｅｄｔｅｃｔｏｎ－ｉｃｍｏｖｅｍｅ...

简介：拿Yucheng，在是的山东省的一个典型的农业县一个盒子，应用逻辑回归建模空间地识别影响农田的因素的这研究变化。用在2001和2009的高分辨率形象的二个阶段，学习在20012009获得了陆地使用和农田变化数据。农田被5.14%在时期减少，这被发现，主要由于到森林土地的农田变换并且布满建筑物土地，尽管森林土地的部分和闲置的土地被变换成农田。逻辑回归的结果显示那个地点，人口生长和农民收入是影响农田变换的主要因素，当土壤打字时并且支持弯曲是控制农田变化的分发的主要自然因素。地区性的差别和农田变化的时间空间的变量影响了逻辑回归模型的恰当的能力。巨鸟恰当的测试显示逻辑回归模型给了地区性的陆地使用变化的好解释。逻辑回归分析是一个好工具鉴别影响陆地使用的主要因素由确定改变每个因素的贡献。

简介：AwesternNorthPacifictropicalcyclone(TC)intensitypredictionscheme(WIPS)isdevelopedbasedonTCsamplesfrom1996to2002usingthestepwiseregressiontechnique,withthewesternNorthPacificdividedintothreesub-regions:theregionnearthecoastofEastChina(ECR),theSouthChinaSearegion(SCR),andthefaroceanicregion(FOR).OnlytheTCswithmaximumsustainedsurfacewindspeedgreaterthan17.2ms1areusedinthescheme.Potentialpredictorsincludetheclimatologyandpersistencefactors,synopticenvironmentalconditions,potentialintensityofaTCandproximityofaTCtoland.VariancesexplainedbytheselectedpredictorssuggestthatthepotentialintensityofaTCandtheproximityofaTCtolandaresignificantinalmostalltheforecastequations.OtherimportantpredictorsincludeverticalwindshearinECR,500-hPageopotentialheightanomalyattheTCcenter,zonalcomponentofTCtranslationspeedinSCR,intensitychangeofTC12or24hpriortoinitialtime,andthelongitudeofTCcenterinFOR.IndependenttestsarecarriedoutforTCsin4yr(2004-2007),withmeanabsoluteerrorsofthemaximumsurfacewindbeing3.0,5.0,6.5,7.3,7.6,and7.9ms1for12-to72-hpredictionsat12-hintervals,respectively.Positiveskillsareobtainedatallleadingtimelevelsascomparedtotheclimatologyandpersistencepredictionscheme,andthelargeskillscores(nearorover20%)after36himplythatWIPSperformsespeciallybetteratlongerleadingtimes.Furthermore,itisfoundthattheamendmentinTCtrackpredictionandreal-timemodelanalysiscansignificantlyimprovetheperformanceofWIPSintheSCRandECR.FutureimprovementswillfocusonapplyingtheschemeforweakeningTCsandthosenearthecoastalregions.

简介：TheGlobalPositioningSystem(GPS)isanewmethodtomonitorthecrustaldeformationforearthquakeprediction.Nowafour-dimensionalcrustaldeformationmonitoringnetworkapplyingGPStechniqueshasbeenestablishedinNorthChina,whichisanimportantseismicmonitoringarea.Resultswithhighprecisionhavebeenachievedinthefirstmeasurementsinceaseriesofadvancedmethodsandmeasureswereadopted,andthusagoodfoundationhasbeenlaidforfutureresearchesonearthquakepredictionandgeodynamics.