简介:ThispaperfocusesonthestudyofoceanbathymetricinversionfromsatellitealtimeterdatabyusingFFTtechnique.Inthisstudy,thefree-airgravityanomaliesovertheSouthChinaSeaaredeterminedbythesatellitealtimeterdataofGEOSAT,ERS-1,ERS-2andT/P.Andthe2.5′×2.5′bathymetrymodelinSouthChinaSeaiscalculatedfromthegravityanomalieswiththeinversionmodelgiven.Aftertheanalysisoftheinversionandthecomparisonbetweentheresults,someconclusionscanbedrawn.
简介:<正>Complicatedsystem(collage)ofblockstructuresandorogenicbeltshadbeenformedintheS-EofAsiabycollisionprosessesinMesozoicandCenozoicperiods.ThiscollagebegantoforminearlyMesozoicasaresultofdestructionofthecontinentalProterozoic-Paleozoiccrustandmovementsoflargeterreines.IndosinianandYangtzeblocks(smallplates)arethemostcharacteristicblock-terranesoftheregion;MyanmarandSongpanblocksystemsarelessrepresentative.Variousetypesofcollisionbeltsaresituatedbetweentheseblocksandontheperipheryoftheplates.Theyconsistofconcordantfoldedsystemsandshearzones.Someofthesesystemsandshearzones
简介:Thecompositionofdetritalmineralswithgradesof0.063-0.25mminthesuperficialsedimentofSouthYellowSeaismainlystudiedinthepaper.Theresearchresultshowsthatthemineralscanbedividedintomorethanfiftysorts.Thelightmineralsaremainlyfeldspar,quartz,mica,etc.Theheavymineralsaremainlycomposedofamphibole,epidote,mica,autogenypyrite,magnetite,hematite,garnet,zirconandsoon,whichmainlydistributeinthesedimentsofsiltyclayandlutaceoussilt.Accordingtothecontentanddistributionofthemainminerals,theresearchareaisdividedintofivemiteralcombinationprovinces.Theassembledtypesofmineralsineveryprovincehavecloserelationshipwithitshydrodynamicconditionsandsedimentaryenvironment.Andthesortsofdetritalmineralsalsoshowthatthedetritalsubstancesinthesedimentaryareasmainlyoriginatefromthedrainageareasofrivers,bedrockweathering,andtransformedsediment,etc.
简介:<正>ThenorthChinablockisborderedonthenorthbytheYinShan,onthewestbytheHelanShan,onthesouthbytheQinLing-DabieShan,andtotheeastbythesea.ThesouthChinablockisborderedonthenorthbytheDabaShan(QinLing)-DabieShah,onthewestbytheLongmenShan-DaliangShan,onthesouthwestbythegreatfaultalongtheRedRiver,andtotheeastandsoutheastbythesea.Thetopographyofthenorthissimpleandeven,likeatwo-stagedterracehigherinthewest.Thoughthatofthesouthisalsohigherinthewest,itisveryunevenwithaboundantlowerandmiddlemountainsandhills.TheQinLing-DabieShanisanarrowbeltwiththe
简介:TheDevoniansuccessioninSouthChinaiswell-knownforitscompletedevelopment,vari-fiedsedimentarytypes,remarkablelithofaciesvariationandabundantmineralresources.TheSouthChinaplatewasformedbythecollisionandcollageoftheYangtzeplateandtheCathaysianplate.ThecollisionbeganapproximatelyattheJinningianstageandthecollagewasnotfinalizeduntiltheGuangxianmovement.ItwasontheSouthChinaplatewithasomewhatdifferentnatureofthebasementthattheDevoniandepositionformed.
简介:AmarinestratigraphicsequenceacrossthePliocene/Pleistoceneboundaryhasbeenfoundinthenorth-erncontinentalshelfoftheSouthChinaSea.ThemarineQuaternarydepositsintheYinggehaiBasinmayex-ceed2,000minthickness,probablyprovidingthebestsectionforstudyingthelowerboundaryofthemarinePleistoceneinSouthChina.TheverticalsuccessionwithplanktonicforaminifersandnannofossilsrevealedinboreholesinthebasinhasbeenwellcorrelatedwiththatintheinternationalstratotypesectionofthePliocene/PleistoceneboundaryatVrica,Italy,resultingintheacquirementofabiostratigraphicboundaryat1.64Ma.Thisboundary,however,doesnotcoincidewithanyprominentlithologicalpalaeoenvironmentalchangesinthestudyareaandcanhardlybeusedingeologicalpractice.Thereare,incontrast,significantchangesatthelevelofLADofGloborotaliamulticameratasensulatolocatedbelowtheabove-mentionedboundary.Thepercentageofplanktonicforaminifersinthetotalpopulationandpreservationofforaminiferaltestsdisplaygreatchangesatthislevelcorrespondingtoaclearonlapontheseismicprofilesandindicatingadepositionalhiatusatca.2.0-2.5Ma.SincethelevelcanbewidelytracedinthePearlRiverMouthBasinandtheBeibuGulfBasinandwellcorrespondswiththemarkeddepositionalenvironmentalchangesrecordedinthewestPacificandotherregions,itisrecommendedthatthePlio/PleistoceneboundarybedrawnatthelevelofGr.multicameratasensulatoLAD,roughlyconcurrentwiththeGauss/Matuyamaturn.
简介:系在的系统为钻在的半能沉入水中的钻塔起一个重要作用深海。详细分析在进行了很好在2009在华南海在一个深海的地点钻的试用的一个半能沉入水中的钻塔的绳索上被执行。钻塔是30岁并且与457m的设计的最大的操作的水深度有一个浅平台。后面的系在分析,一个系在的图案被给那要求钻塔原版绳索系统升级。升级包括了几革新,例如安装八个更大的锚,即代替原来的锚并且插入一另外有存在的链的钢电线的600m。所有这些被做为在职务要保持进行在476m的水深度钻的钻塔提高钻塔的系在的能力。钻的全面持续时间是50天和证明在当它在华南海正在钻试用很好时,达到使钻塔静止的目标有效的升级的绳索系统。这个成功的运动证明一个更旧的半能沉入水中的钻塔能雇用在小心的设计并且到原来的绳索系统的合适的升级和修正以后在深水里钻。
简介:ThemeasurementsbyusingADCP(500KH)andCTDweremadeduringAugust2000inthesouth(37°55'N,120°25'E)oftheBohaiSea,wherethewaterdepthwasabout16.5m.Thedataofhorizontalvelocitywithsamplingintervalof2minin7layerswereobtained.Thepowerspectrumanalysisofthesedataindicatesthatthereareveryenergeticinfragravitywaveswithaperiodofabout6min.Thecoherencespectrumanalysisandtheanalysisoftemporalvariationofshearshowthattheseinfragravitywavesaremainlythefreewavemodel(propertiesofedgewaves),inthemeantimetheypossesssomecharacteristicsofinternalwaves,whicharelikelyduetothedistinctivemarineenvironmentinthisarea.Itisspeculatedonthattheinstabilityprocesses(chieflyshearinstability)ofshearedstratifiedtidalflowowingtotheeffectofsea-floorslopeinthecoastalareamightbethemainmechanismgeneratingtheseinfragravitywaves.
简介:Dearcolleaguesanddistinguishedguests:Onbehalfoftheorganizingcommitteeofthe11thSouthChinaInternationalCongressofCardiology(SCC),itisourdistincthonortoinviteyoutoattendtheSCCCongress,whichisgoingtobeheldon9-12April,2009atDongfangHotel,Guangzhou,China.
简介:StrengtheningNon-governmentalExchangesandCooperationbetweenChinaandSouthAfricabyZhongWeiyunAttheinvitationoftheChineseAsociat...
简介:Basedonacurrentfogdetectiontheory,amultibandthresholdmethodforMODISdatawasputforwardtodetectdaytimefogintheSouthChinaSea.ItusedBands1,2,18,20and31ofMODISdatatoseparatefogfromthecloudandtheseasurface.Thedigitaldetectionindexeswereasfollows.IfRB1<20%,RB2<20%andRB1>RB2,thepixelwasidentifiedtobetheseasurface.IfRB1>55%,RB2>55%andTB31<273K,thepixelwasidentifiedtobeamiddle-andhigh-levelcloud.IfIFC>20,thepixelwasclassifiedtobeseafog.ThemethodwasverifiedwithseafogdataobservedfromthecoastalregionofGuangdongduringJanuary-April2011.Outofthe13samplesofsatellitedetection,ninewereconsistentwiththesurfaceobservations,threewereidentifiedtobelow-levelthecloudaccordingtothesatellitedetectionbutfogaccordingtothesurfaceobservations,andonlyonesamplewasidentifiedtobetheoceansurfacebythesatellitedetectionbutfogbythesurfaceobservations.BecausetheMODISdatacannotpenetratethecloudorfog,themodelwasdesignedforasinglefieldofviewwhichhadonlyonelayerofcloudorfog.Itcanaccuratelydistinguishfogwhichisnotcoveredbythecloud,butitidentifiesfogascloudiftheformeriscoveredbyacloud.Generallyspeaking,themodeliseffectiveandfeasible.
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:用U.S.National,环境预言/公民的中心在1湯挠獡?桔?敲?瑬?桳睯摥琠慨?桴牥?獩愠挠楲楴慣?楤瑳湡散搠?潦?体噄?为大气的研究分析数据集中湩戠牡'覙H楮?瑡潭灳敨敲圮敨?桴?楤瑳湡散戠瑥敷湥猠灥牡瑡摥瘠牯楴散?獩猠慭汬牥琠慨?牯攠畱污琠?绥鳟彌B?潶瑲捩獥猠汥?牯慧楮敺椠Ь
简介:在这篇文章,backstripping技术在学习Qiongdongnan的沉淀人物被使用()盆(QDNB)以便理解它形成和进化的动态机制。同时,这个区域的地热的特征被总结,并且拉长的因素()上面的外壳,整个外壳,和全部,岩石圈被计算。QDNB被这个区域拉长并且变瘦的高沉淀率,高地热的坡度,高地热的热流动,和岩石圈描绘深度依赖者。因为欧亚的板,和平的板,印度澳大利亚人的板,和菲律宾的海板的相互的subductions,一个岩流圈地区肯定在东南亚洲大陆的岩石圈下面被限制了。这些人物显示那强壮的披风传送对流发生了,更低的外壳材料在领域离开流动了,它导致上面的外壳的快速的曲折均衡沉淀和岩流圈的uplift。
简介:SubmarinelandslideshavebeenobservedintheBaiyunDepressionoftheSouthChinaSea.Theoccurrenceofhydratesbelowtheselandslidesindicatesthattheseslopeinstabilitiesmaybecloselyrelatedtothemassivereleaseofmethane.Inthisstudy,weusedasimpleMonte-Carlomodeltodeterminethefirst-orderdeformationpatternofagravitationallydestabilizingslope.Theresultsshowthatastressconcentrationoccursduetohydratedissociationonthenearbyglidesurfaceandontopofagaschimneystructure.Uponthedissolutionofthegashydrate,slopefailureoccursduetotheexcessporepressuregeneratedbythedissociationofthegashydrates.Whengashydratesdissociateatshallowdepths,theexcessporepressuregeneratedcanbegreaterthanthetotalstressactingatthosepoints,alongwiththeforcesthatresistsliding.Initially,thefailureoccursatthetoeoftheslope,thenextendstotheinterior.Althoughourinvestigationfocusedonlyonthecontributionofhydratedecompositiontosubmarinelandslide,thisprocessisalsoaffectedbyboththeslopematerialpropertiesandtopography.
简介:Previousstudiesemphasizetheimportantroleofa'north-ridgeversussouth-trough'dipole(affectingthelatitudesfrom20°to75°NaroundtheTibetanPlateau)ofanomalousgeopotentialheight(Z)intheearly-2008abnormalcryogenicfreezing-rain-and-snoweventsinthesouthernpartofChina.ThepresentstudyintendstoextracttheleadingsignalfacilitatingthedipolebasedonthenumericaloutputsofafullZ-linearmodelfordiagnosingtheglobalZ.Usingthismodelbuiltonfullprimitiveequationsinspherical-isobariccoordinates,wecanfurthersplittheanomalyofZ-Zfζ-uβ(representingtheZcomponentnotexplicitlyassociatedwiththeCoriolisparameterfanditsmeridionalderivativeβ)into15components.Withthemodel-outputZfζ-uβ(mainlyaccountingforthedipoleunderthegeostrophicbalance)andZ-Zfζ-uβmatricesastheleftandrightsingularvectorsrespectively,amaximumcovarianceanalysis(MCA)isperformedtoextractthesignificant2-4-dayleadingsignalcarriedbytheMCAZ-Zfζ-uβmodeintheupstreamareaofthedipole.Thisleadingsignalismainlyattributedto1)theabnormallystrongwesterliescenteredaroundtheexitregionoftheAtlanticjet-streamand2)thecorrespondinganomalous950-300hPaanticyclonetothesouthoftheabnormallystrongcenterofwesterlies.Theenergyofthepositivewavecenteraroundthisjetexitregionfavorsthedownstreamnorth-ridgewhiletheenergyofthenegativewavecenterassociatedwiththeanomalousanticyclonefavorsthedownstreamsouth-trough.