简介:EasternChinaandvicinalseaareas(98°~150°E,5°~50°N)arelocatedinthejunctionzoneofEurasianandPacificplates,anditisalsoprofoundlyinfluencedbythecollisionbetweenIndianandEurasianplates.Weutilizedsurfacewavedatarecordedby35digitalseismicstationsinthearea,extracteddispersioncurvesoffundamental-modeRayleighwavesalong1252pathsbymeansoftime-frequencyanalysisbasedonmultiple-filterandothertech-niques.Thestudyareawasdividedintoagridof1°′1°,groupvelocitydistributionsoffundamentalRayleighwavesbetween10~158sweredeterminedbyOccam¢sinversion.Thesevelocitydistributionsroughlydepictthelateralvariationsofshearwavevelocitiesindifferentdepthranges.WiththedeterminedpurepathdispersionswefurtherinvertedfortheSwavevelocitystructuresalongtwoprofilesfromeasternTibettoPacificOceanandfromSouthChinaSeatoMongolia.Itisfoundthatthelateralheterogeneityisobviousdownto400kmdepth,andthevelocitystructuresarecorrelatedwithtectonicunitsinthestudyarea.
简介:Theoreticalbeamintensitydistributionisderivedfortheneutral-beam-injectionionsourcewithamulti-slotextractioninEAST.Thebeamintensityprofile,bothalongandperpendiculartotheinjectingdirectionandthebeampowerdepositiontotheinnerelementsintheneutralbeaminjector(NBI)areevaluated.Theresultsindicatethatthetransversebeamintensityismuchhigherthanthelongitudinalone.Thisstudycouldprovideinformationforthedesignofvacuumsystem,structureofinnerelementsandcoolingsystemoftheneutralbeaminjectorinEAST.
简介:TheNCARcommunityclimatemodelwasrunfor20yearsandthesimulatedEastAsianclimatewasanalyzedandcheckedagainsttheobservationdata.Itisfoundthatthelarge-scalefeaturesoftheEastAsiaclimateweresimulatedprettywellbythemodel,thoughtherearestillsomediscrepanciesbetweenthemodeloutputandtheobservation.Thesimulatedgeopotentialheight,windandtemperaturefieldsareveryclosetotheobservations.Thelargescalesystemssuchassubtropicalhigh.Mongoliahigh,IndianlowwhichhaveimportantinfluenceontheEastAsiamonsoonalsosimulatedprettywell.Itisalsofoundthatthemoisturefieldisnotsimulatedsowellasthosefieldsmentionedabove.Thesimulatedprecipitationisratherdifferentfromtheobservations.ThesesuggestthatsomephysicalprocessesintheCCM2needtobeimproved.
简介:WorkersonOctober29completedatunnelunderChina'sYangtzeRiverforamajorgaspipelinethatwillrunfromthesouthwestprovinceofSichuantoShanghaiineastChina.Withadiameterof3.08metersandalengthof1,405meters,thetunnellaidabout20metersbeneaththeriverbed,connectingtwogaswellsoneachbankoftheYang-
简介:600年的集成与Bergen气候模型和公民一起执行了的A为环境预言/公民中心集中因为大气的研究(NCEP/NCAR)分析数据被用来在东方亚洲夏天季风(EASM)和EASM降雨上调查强壮的热带暴烈的爆发的影响。模拟和NCEP/NCAR分析数据显示出一在强壮的爆发年里变弱EASM。模型模拟建议诺思和华南经历干旱,Yangtze-Huaihe河山谷在爆发年期间经历洪水。响应强壮的热带暴烈的爆发,在上面的对流层的南方的空气温度坡度被提高,它导致向南方的移动和东方亚洲副热带的西的喷气溪流(EASWJ)的增加。同时,陆地海在亚洲陆地团之间的热对比和西北太平洋被削弱。陆地海的EASWJ和减小的向南方的移动和增加所有贡献一变弱EASM和EASM降雨异例的热对比。
简介:宋玉成,黄荣辉TheDynamicalEffectsofDivergentWindontheIntraseasonalvariabintyoftheEastAsianCirculation¥SongYuchengandHuangRonghui(Ins...
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简介:ThecoastalcitiesarethemostadvancedregionsinChina.Inthepastfewdecades,theenvironmentchangedverysignificantlyduetolargescalehumanactivitiesinthecoastalregions.Polycyclicaromatichydrocarbons(PAHs)inthreedatedsedimentcoresfromthewestcoastoftheYellowSea(coreA01),theYangtzeRiverestuary(YRE;coreA02)andtheOujiangRiverestuary(ORE;coreA03)wereanalyzedtoreconstructtheenvironmentalevolutionaryprocessoftheeastChinacoastalregionoverthepastcentury.Inthethreecores,PAHsconcentrationswereincreasedrapidly.LowerconcentrationsofPAHsweremeasuredincoreA02thanincoresA01andA03.TheverticalvariationofPAHsintheYREWasdominatedbythepetrogenicsources.HistoricalrecordsofPAHsintheOREwerecontrolledbypyrolyticsources.PAHsonthewestcoastoftheYellowSeawerecontributedbythetwosources.
简介:东方Asiansubtropical西的喷气(EAWJ)和热机制的紧张和地点的季节变异被从1961~2000使用NCEP/NCARmonthlyreanalysis数据分析。EAWJ的季节变异集中,这被发现不仅有重要南方的移植,而且显示出快速的带的排水量duringJune7月。而且,在那里存在带的矛盾在向北方转移EAWJaxis的过程。EAWJ季节变异的热机制上的分析显示EAWJ季节变异的年度周期与气温的南方的差别的结构匹配很好,建议EAWJ季节变异是仔细与由于太阳辐射和陆地海的不同类的加热有关热对比。Throughinvestigating在EAWJ和热运输之间的关系,这被揭示EAWJweakens和移动向北方在到夏日的从冬的温暖的时期期间,而theEAWJ加强并且变在到冬的从夏日的冷却时期期间向南方。水平热移流运输的Themeridional差别是决定南方的温度差别的主要因素。EAWJ的南方的移动跟随水平热移流运输的最大的南方的坡度的地点。在从Aprilto10月的时期期间,加热的diabatic在EAWJcenter的带的排水量起主角。西藏的高原加热到中间上面的对流层的diabatic在6月7月期间导致EAWJ中心的快速的带的排水量。
简介:QuantitativedistributionofplanktonicamphipodaintheEastChinaSeaisanalyzedandtherelationwithenvironmentalfactorsandmackerelandscadfishinggroundsisstudied.Theresultshowsthatthecharacteristicofbiomassisgreatseasonalandinterannualvarietyduringthepassingthreedecades.Thedistributionofplanktonicamphipodabasicallyreflectsthemovement,decayandintensificationofthedifferentwatersystemsinthesurveyarea.
简介:Windvelocityreductionofcoastalshelterbeltsystemwasmonitoredfor1monthin3weatherstationsinNanhui,Shanghai,andthebenefitsofshelterbeltsystemandtrunkshelterbeltforestwerecomparedinthispaper.Theresultsshowedthewindvelocityatthefirstweatherstation(W1),whichlocatedinfrontoftrunkshelterbeltforestbytheseaside,wasthebiggest,withtheaverageof9.36m/s;thewindvelocityatthesecondweatherstation(W2)waslowerthanthatatW1,withtherangeof0to18.2m/sand...