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118 个结果
  • 简介:影片讲述了在冰河世纪这个充满惊喜与危险的蛮荒时代,因为一名突如其来的人类婴儿,让三只性格迥异的动物凑在一起的故事。其中,曼菲德和席德一心想护送婴儿返回亲人身边,而迭哥则试图将他们带入自己族类设下的埋伏圈。

  • 标签: 英语教学 教学方法 阅读知识 课外阅读
  • 简介:冰球(icehockey),又称冰上曲棍球,是运动员穿着特制的冰刀、护具和服装,手持球杆在冰场上击球的一种冰上球类运动。冰球以击入对方球门内的球数多者为胜。

  • 标签: 冰球 冰上曲棍球 球类运动 球杆
  • 简介:Inthisstudy,changesinArcticseaicethicknessforeachiceagecategorywereexaminedbasedonsatelliteobservationsandmodelledresults.InterannualchangesobtainedfromIce,Cloud,andLandElevationSatellite(ICESat)-basedresultsshowathicknessreductionoverperennialseaice(icethatsurvivesatleastonemeltseasonwithanageofnolessthan2year)uptoapproximately0.5–1.0mand0.6–0.8m(dependingoniceage)duringtheinvestigatedwinterandautumnICESatperiods,respectively.Pan-ArcticIceOceanModelingandAssimilationSystem(PIOMAS)-basedresultsprovideaviewofacontinuedthicknessreductionoverthepastfourdecades.Comparedto1980s,thereisaclearthicknessdropofroughly0.50min2010sforperennialice.Thisoveralldecreaseinseaicethicknesscanbeinpartattributedtotheamplifiedwarmingclimateinnorthlatitudes.Besides,wefigureoutthatstronglyanomaloussoutherlysummersurfacewindsmayplayanimportantroleinpromptingthethicknessdeclineinperennialicezonethroughtransportingheatdepositedinopenwater(primarilyviaalbedofeedback)inEurasiansectordeepintoabroaderseaiceregimeincentralArcticOcean.Thisheatsourceisresponsibleforenhancedicebottommelting,leadingtofurtherreductioninicethickness.

  • 标签: 北极海冰 厚度变化 年龄变化 ICESAT 海冰厚度 卫星观测
  • 简介:ThemainactivitiesinthejointexpeditionbetweenCHINAREandANAREonAmeryiceshelfareintroduced.Five-daycontinuousGPSobservationdatacollectedonthesitewhichlocatesatthefrontalpartofAmeryiceshelfwasprocessedwithprecisepointpositioning(PPP)technologybasedonpreciseproductsfromIGS.VelocityofthesurfaceiceflowonAmerycanbederivedfromthePPPsolution.Preliminaryresultshowsthatthesurfaceiceflowvelocityofthesiteis2.25metersperday,themotiondirectionisnortheastward.SemidiurnaloceanictideanddiurnaloceanictidesignalofthatsitecanberecoveredfromtheheightvariationseriesofPPPsolution.Theseabovesolutionscanbeusedtotheconsequentmassbalancecalculation.

  • 标签: GPS 全球定位系统 冰体流动 南极
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  • 简介:Asthefirstacrobaticartistictroupewiththeperformanceonice,HeilongjiangAcrobaticsandDancingonIceTroupehasbeenonafastdevelopingwayinvirtueofherperseveranceonacrobaticsandhasstartedtoshineuniquelyintheperformancemarketsinceherfounding.

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  • 简介:海冰飘移的许多有趣的特征取决于大气拖系数(C)并且海洋拖系数(Cw)。Parameterizations拖系数而非经常的价值提供我们在海冰上看卓见进这些特征的依赖的一个方法调节。在现在的学习,parameterized冰拖系数被包括进免费飘移的海冰动态模型,并且在海冰之间的风因素和偏转角度漂流并且弯屈速度以及C到Cw被学习在象本地人那样的影响因素上调查他们的依赖拖系数,大浮冰和山脉几何学。结果在理想化的稳定的海洋揭示那,C/Cw在边缘的冰地区为小冰大浮冰与增加的冰集中显然增加,当它为大大浮冰在稳定的水平(0.20.25)留在中央冰地区时。风因素起初很快增加并且当A比20%大时,接近0.018的稳定的水平。并且偏转角度从起始的价值很快落下接近80慦桳潩?

  • 标签: 海冰边缘区 参数化 漂移 拖曳系数 局部阻力系数 摩擦阻力系数
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  • 简介:<正>实战编辑刘可为:进入了炎炎盛夏,是否怀念冬日的一丝凉意。很多摄影爱好者会希望有探索冰洞拍摄的机会,而在这样一个温度里坐在家中依旧能给你冰霜幻境。透光的冰洞一直是户外摄影爱好者向往的探险之地,现在身处家中也能通过镜头实现身未动心已远的神奇视觉体验,给炎炎夏日一抹蓝。

  • 标签: 户外摄影 冰洞 ICE HOLE 视觉体验 刘可
  • 简介:Asasubstitutefortheoriginaldisplacedpolegrids,asimplerotatedsphericalcoordinatesystemwasintroducedintotheCommunitySeaIceModelversion4(CSIM4),whichisacomponentoftheCommunityClimateSystemModel(CCSM)oftheAmericanNationalCenterofAtmosphericResearch(NCAR),todealwiththe'poleproblems'.Inthenewcoordinates,boththegeographicalNorthPoleandSouthPolelieinthemodelequatorandgridsizesnearthepolarregionaremoreuniform.WithreanalysisdatasetofAmericanNationalCentersforEnvironmentPrediction(NCEP)andLevitusdatasetwithoutconsideringsub-mixedlayerheatflux,themodelwasintegratedfor100yearswiththermodynamicsprocessinvolvedonlyintheformer49yearsandbothdynamicandthermodynamicprocessesinvolvedinthelefttime.Innerconsistencyofmodelresultswascheckedwithnocontradictionfound.Theresultsoflast10years'modeloutputwereanalyzedanditisshownthatthesimulatedseaiceseasonalvariationisrationalwhereasseaiceextentintheBarentsSeainwinterislargerthanthatofobservation.Numericalexperimentoninfluenceofsub-mixedlayerheatfluxwasalsocarriedoutanditisshownthatthesub-mixedlayerheatfluxcanmodulateseasonalvariationofseaicegreatly.Asamodelcomponent,theseaicemodelwithrotatedsphericalcoordinateswascoupledwithothermodels(theoceanicgeneralcirculationmodelistheLASG/IAPClimateSystemOceanModel(LICOM)withreducedgrid,othermodelsarecomponentsofNCARCCSM2)formingaclimatesystemmodelanditspreliminaryresultswerealsogivenbriefly.

  • 标签: 海冰模拟实验 数字模拟 气候系统模型 旋转球面坐标系统
  • 简介:Theseaicecoverdisplaysvariousdynamicalcharacteristicssuchasbreakup,rafting,andridgingunderexternalforces.Tomodeltheicedynamicprocessaccurately,theeffectivenumericalmodelingmethodshouldbeestablished.Inthispaper,amodifiedparticle-in-cell(PIC)methodforseaicedynamicsisdevelopedcouplingthefinitedifference(FD)methodandsmoothedparticlehydrodynamics(SPH).Inthismethod,theicecoverisfirstdiscretizedintoaseriesofLagrangianiceparticleswhichhavetheirownsizes,thicknesses,concentrationsandvelocities.TheicethicknessandconcentrationatEuleriangridpositionsareobtainedbyinterpolationwiththeGaussianfunctionfromtheirsurroundingiceparticles.ThemomentumoficecoverissolvedwithFDapproachtoobtaintheEuleriancellvelocity,whichisusedtoestimatetheiceparticlevelocitywiththeGaussianfunctionalso.Thethicknessandconcentrationoficeparticlesareadjustedwithparticlemassdensityandsmoothlength,whichareadjustedwiththeredistributionoficeparticles.WiththeabovemodifiedPICmethod,numericalsimulationsforicemotioninanidealizedrectangularbasinandtheicedynamicsintheBohaiSeaarecarriedout.ThesesimulationsshowthatthismodifiedPICmethodisapplicabletoseaicedynamicssimulation.

  • 标签: 海冰 动力学分析 PIC 数值模拟 FD
  • 简介:Rivericeisanimportanthydraulicelementintemperateandpolarenvironmentsandwouldaffecthydrodynamicconditionsofriversthroughchangesbothintheboundaryconditionsandthethermalregime.Theriverbendhasbeenreportedasthecommonlocationfortheinitiationoficejamsbecausethewaterflowalongariverbendismarkedlyaffectedbythechannelcurvature.Inthisarticle,theexperimentalstudiesabouttheiceaccumulationinariverbendarereviewed.Basedonexperimentsconductedsofar,thecriteriafortheformationoficejamsintheriverbend,themechanismsoftheiceaccumulationintheriverbendandthethicknessprofileoftheiceaccumulationintheriverbendarediscussed.Thetwo-equationturbulencemodelisusedtosimulatetheiceaccumulationunderanicecoveralongariverbend.Aformulaisproposedfordescribingthedeformationoftheicejambottom.Ourresultsindicatethatallsimulatedthicknessoftheiceaccumulationagreesreasonablywellwiththemeasuredthicknessoftheiceaccumulationinthelaboratory.

  • 标签: 河湾 积冰 厚度测量 水动力条件 实验室 边界条件