简介:ThedistributionofprecipitationfieldfromthetyphoonHaitang(2005)duringitslandingonFujianprovinceshowsobviousasymmetricfeature.BasedontheNCEP/NCARFNL(FinalAnalysis)data,thisstudyrevealsthecontributionsofatmosphericfactortotheasymmetricaldistributioncharacteristicsofprecipitationassociatedwiththetyphoon,throughtheanalysisofwatervaporcondition,verticalascendingmotioncondition,thecalculationofthedryQvectoranditsdecomposition,andadiabaticheatingintheaircolumnof1000hPa-600hPa(loweratmosphere)and500hPa-100hPa(upperatmosphere).Theresultsareasfollows:(1)Intheloweratmosphere,thehumidityonbothsidesoftyphoonpathcanbeequivalent,whileitismorewetontherightsidethanleftintheupperatmosphere,whichobviouslypresentsasymmetricdistributioncharacteristics.(2)Bothrangeandintensityoftheverticalmotionontherightsidearewiderandstrongerthancounterpartsontheleftsidenomatterinthelowerorupperatmosphere.(3)Intheupperatmosphere,forcingroleofatmosphereinverticalupwardmotionontherightsideoftyphoonpathisthesameasthatontheleft,whileitissignificantlydifferentintheloweratmosphere,whichissignificantlybroaderinscopeandstrongerintheintensity,alongwithobviousasymmetricdistributioncharacteristics.Inaddition,thefurtheranalysisoftheQvectordecompositionindicatesthattheforcingeffectofmesoscaleweathersystemsonverticalupwardmotionisstrongerthanthatoflargescaleweathersystemsintheloweratmosphere.(4)Theadiabaticheatingalwaysexistsonbothlowerandupperatmosphere,andtherangeandintensityoftheadiabaticheatingforcingshowedasymmetricdistributiononbothlowerandupperatmosphere.(5)Inasummary,theupperatmospherehumidityconditions,theforcingroleofloweratmosphereinverticalupwardmotion,especially,tomesoscaleweathersystem,andadiabaticheatingintheloweratmosphere,allshowsimilarasymmetricdistributioncharacteristics
简介:Basedon6-hourlysensibleheatfluxandlatentheatfluxfromtheNCEPClimateForecastSystemReanalysis(CFSR)andcirculationdatafromtheJapanese25-yearReanalysis(JRA-25),theinitialdevelopingprocessoftropicalcycloneMindulle(1005)in2010hasbeendiagnosedtorevealtheimpactofair-seainteractionovertheSouthChinaSea(SCS)onthegenesisofitsincipientvortex.TheresultsshowthattheincipientvortexfirstoccurredeastoftheLuzonIslandon0000UTC20August,suggestingthatthetopographicforcingoftheLuzonIslandforeasterlywindsoverthewesternPacificmightbeoneofthefactorsresponsiblefortheformationoftheincipientvortex.Duringtheformationstageoftheincipientvortex,strongsoutheasterliesovertheSCScausedwarmwaterofthemiddleandeasternSCStoflowtowardtheLuzonIslandduetoEkmantransportresultingfromwindstress,leadingtoanincreaseoftheseasurfacetemperatureandsensibleheatfluxintotheatmosphere.Althoughtheanomaloussensibleheatingfavoredsurfacepressuretoreduce,itwasnotconducivetotheincreaseoflocalvorticityassociatedwiththevortexabovetheheatingareabecause,accordingtotheatmosphericthermaladaptationtheory,theanticyclonicvorticitywouldbecreatedinthelowertroposphereduetothedecreasedverticalgradientofthesensibleheating.However,theascendingmotionsoccurredovertheeasternareaoftheanomaloussensibleheatingduetotheaugmentationofthevorticityadvectionwithincreasingheight,causingwatervaportocondenseinthemiddleanduppertroposphere.Inturn,cyclonicvorticitywasgeneratedinthelowertroposphereduetotheincreasedverticalgradientofthecondensationlatentheating,resultingintheformationandfurthergrowthoftheincipientvortex.Therefore,thevorticitycreationduetothecondensationheatingplayedadominantroleduringthesubsequentenhancingstageoftheincipientvortex.
简介:以SCI数据库中Scientometrics2000~2014年期间刊载的2415篇论文为研究对象,采用文献计量学的方法,从载文量、被引情况、合作情况、核心作者、研究热点等几个角度进行分析,同时对中国作者发表的论文进行重点分析。研究结果表明,中国的发文量逐年上升,2011~2014年一直排在第一,但是总被引次数以及篇均被引次数都偏低,合作论文以国内合作为主,国际合作比例偏小,主要的合作国家有美国、比利时等。
简介:WeperformedasystematictraceandrareearthelementanalysisforthebeddedFe-MncarbonaterocksrelatedtothestratiformAg-Pb-ZnmineralizationintheLengshuikengoredistrict,JiangxiProvince,SouthChina.ThreetypesofFe-Mncarbonatesaredistinguished,namely,themassive,breccia,andveintypes.Bothcarbonateandsilicatefractionsinthesamplesareanalyzedfortheirtraceandrareearthelementconcentrationsusingastepacid-leachingtechnique.OurresultsshowthatthecarbonatefractionsinthemassivetypesampleshavethelowestREEconcentrationsbutpronouncedpositiveEuandYanomalieswithEu/Eu*valuefrom1.3to6.2andY/Hovaluefrom40.1to59.5,andsimilarcharacteristicsarealsoshownforthesilicatefractionsinthemassivetypesamples(Eu/Eu*=1.0–6.7,Y/Ho=20.7–55.1).TheseREEcharacteristicsaresimilartothoseofSedextypemassivesulfidedepositsworldwide,andwesuggestthatthemassivetypeFe-Mncarbonaterockswerelikelyformedfromanexhalativevolcanic-hydrothermalfluidfeedingthedepressionbasinofavolcaniclake.Thehighconcentrationsofredox-sensitiveelementsandratiossuchasU/Th,V/CrandV/(V+Ni)indicateadysoxicenvironmentfortheFe-Mncarbonatedeposition.Incontrast,thebrecciatypeandveintypeFe-Mncarbonatesamplesshowdifferenttraceandrareearthelementfeaturesfromthoseofmassivetypesamples,andtheyaremoresimilartothevolcanicrocksandmagmatic-hydrothermalfluidsintheLengshuikengoredistrictandmayreflectstrongoverprintingfromvolcanicandsub-volcanicmagmatismrelatedtotheporphyrytypemineralizationinthedistrict.
简介:摘要国家测绘局2008年6月18日发公告,要求2008年7月1日起,正式启用2000国家大地坐标系。本文结合我省某市2000国家大地坐标系转换实施情况,简述城市坐标系到2000国家大地坐标系转换方法。
简介:用中等分辨率成像使分光辐射函数正常化的差别植被索引(NDVI)数据集,我们在20002014在Qinling-Daba(Qinba)山在植被范围和它的联系驱动力调查了空间与时间的变化的模式。参议员和MannKendall模型和部分关联分析被用来分析数据,由林中小丘索引的计算列在后面在植被范围分析未来趋势。学习的结果证明(1)学习区域的NDVI在20002014展出了重要增加(线性趋势,2.8%/10a)。在这个时期期间,稳定的增加在2010前被检测(线性趋势,4.32%/10a),在2010以后由锋利的衰落列在后面(线性趋势,6.59%/10a)。(2)空间地,植被盖子在中间显示出高度并且一在环境模式低。植被范围的高价值主要在Shaanxi省的Qinba山被发现。(3)有改进植被范围的区域比降级的区域大,分别地,在学习时期期间是81.32%和18.68%。Piecewise分析表明71.61%全部的学习区域在20102014在植被范围显示出一个减少的趋势。(4)植被范围变化的反向的特征是比Qinba山上的一样的特征强壮的。大约46.89%全部学习区域被预言以后减少,当34.44%全部的区域将跟随一个连续地增加的趋势时。(5)植被范围的变化主要在降水被归因于赤字。而且,植被范围在ElNino年期间在拉·尼娜年期间比那高。(6)人的活动能在植被范围上导致模糊效果:两积极效果(通过生态的恢复工程的实现)并且否定效果(通过都市化)被观察。
简介:基于2000和2010国家普查的府级的数据,瓷器半都市化的空间进化在这研究被分析。都市化的阶段是由考虑半都市化的re-examined。城市的开发的九种类型根据在半都市化和都市化之间的关系被介绍,并且也就是,瓷器都市化高被划分成五个阶段不同格,不同格,低协作,协作,和高度协作。结果证明那瓷器半都市化率从一个区域显著地变化到另外一个;它在2010的顺序从对最低价值最高如下:东方,中间,西方,和东北。内陆城市里的都市化和半都市化率在沿海的城市里比那些快增加大部分。另外,半都市化越过中国显示类似于都市化的一个空间模式,与东北区域的唯一的异常。通过空间自相关分析,半都市化的空间集中决心正在增加。高值的集中区域在沿海的东方正在膨胀,而低值的集中区域在东北正在成长。最后,瓷器都市化模型的进化在学习十年建议在都市化和半都市化之间的协作的一个变弱的趋势。半都市化能被看作瓷器hukou系统的特殊生产,它在城市里限制候鸟的永久解决。因此,当都市化和citizenization发展,瓷器半都市化趋势被期望展出一个颠倒的U字形的模式。