简介:波浪光线理论被采用与不对称的基本流动在台风学习旋涡Rossby波浪的繁殖小径(光线)的特征,在正切的不对称的基本流动被在对称的基本流动上附加wavenumber-1不安流动构造的地方,并且光线的基本流动从非分叉方程被导出。在某个远处,在组速度和旋涡Rossby波浪的光线的斜坡上的基本流动的不对称现象的影响主要是的结果表演在最大的风(RMW)的半径附近专注,而它在RMW外面减少。在不对称的基本流动的旋涡Rossby波浪的光线、正切的组速度的分布是仔细,与这个组上的光线、正切的基本流动的不对称的基本流动,和重要性的最大的速度的方位角地点有关,速度将随着半径变化。另外,在基本流动的更强壮的不对称现象总是对应于旋涡Rossby波浪的更快的外面的精力繁殖。简言之,组速度,并且从而,波浪精力繁殖和旋涡Rossby波浪光线在台风倾斜,将被基本流动的不对称现象改变。
简介:TheKdVequationwithtopographyincludedinanN-levelmodelisderived.Itisshownthatifthetopographyex-ists.theKdVequationmaydescribethesolitaryRossbywavesinthecaseofbasiccurrentwithoutverticalshear,anditisnonecessarytointroducetheMKdVequation.Theresultsofcalculationsshowthatthechangeofhorizontalshearpatternofbasicflowmaycauseanimportantchangeofthestreamlinepatternofthesolitarywaveswiththeoddmeridionalwavenumberm,andhasnoeffectfortheevenmeridionalwavenumberm.Theverticalshearincreasesthesteepnessofthebarotropicsolitarymodes,andithasacomplicatedeffectonthebaroclinicmodes.Theinfluencesoftopographicslopeonthesolitarywavesareverygreat.Thesouthernandnorthernslopesoftopographymaycausedif-ferentsolitarywavepatterns,withtheeffectofnorthernslopegreater.TheeffectofFroudenumberonthesolitarywavesisgenerallytosteepenthesolitarywaves,however,theeffectalsodependsonthemeridionalwavenumbermandthemodesofsolitarywave.
简介:本文给出了Benjamin-Ono方程的孤立波解,并应用M.Grillakis[4,5]等的抽象理论,通过谱分析,证明了该孤立波解是轨道稳定的。
简介:AninhomogeneousKdVequationincludingtopographicforcingisderivedbyusingperturbationexpansionsandstretchingtransformsoftimeandspace.ThegenerationofforcedsolitaryRossbywavesbytopographyinanear-resonantflowandtheirinteractionswithfreesolitarywavesarediscussed,andsomeinterestingresultsareobtained.Thenumericalresultsshowthatthetopographyhasobviouseffectonenhancingtheamplitudeofdisturbances,anditmayexplaintosomedegreetheformationofblockingbylocalizedtopography.
简介:本文给出了Benjamin-Ono方程的孤立波解,并应用M.Grillakis[4,5]等的抽象理论,通过谱分析,证明了该孤立波解是轨道稳定的.更多还原
简介:本文利用改进的齐次平衡法,首先得到了带强迫项的变系数KdV方程的多孤立波解,然后借助此解得到了强迫KdV方程的多孤立波解.最后作为应用例子,利用图形分析方法分析了Rossby孤立波的相互作用,指出了影响Rossby孤立波相对幅度、相位、传播方向及平衡位置的主要原因.
简介:Toaddtothegrowingmatureresearchonthetropical30-50dayoscillationsfromanewprospective,thecurrentworkbasesondynamicanalysisofbaroclinicquasi-geostrophicmodelstodiscussdynamicmechanismsforthegenerationandpropagationofCISK-Rossbywaves,andtounderstandrestraintsandeffectsofdifferentwavestructuresandthermodynamicforcingonthe30-50dayoscillationsinthetropicalatmosphere.Someimportantpropertiesoftheoscillationpropagationhavebeenexplainedand,indetail,withrespecttoitsmeridionalpropagationandvertical'baroclinic'structure.Theworkhascomeupwithsomenewopinionsandviewpoints.Newopinionsaboutthepropagationandenergydispersionaretobeprovedbymoreobservationsandstudy.
简介:Characteristicsofthewavesources,energypropagationandconversionforanomalousRossbywaveactivities(RWAs)alongtheWestAsianjetstream(WAJS)insummerareexaminedbasedontheNCEP/NCAR(NationalCentersforEnvironmentalPrediction/NationalCenterforAtmosphericResearch)reanalysisdatafrom1958to2003,usingthevorticitysourceequation,theEliassen-Palm(EP)flux,andthewaveenergyequationunderdiabaticheating.ThestudyaimstofindthedynamicalcausesforRWAanomaliesalongtheWAJSandtoimprovetheunderstandingofmid-highlatitudecirculationanomalies.TheresultsshowthatthenegativevorticitysourceandthestrongEPfluxdivergenceovertheMediterraneanSeaandtheNorthAtlantic-ScandinavianPeninsulaareaactasthewavesourcesforRWAanomaliesalongtheWAJS.Whentheintensityandpositionofthewavesourcesareanomalous,theexcitedeastward-propagatingRWAalongtheWAJSalsobehavesanomalously.Instrong(weak)yearsofRWA,RossbywavesexcitedbythestrongdivergenceofEPfluxesovertheIceland-ScandinavianPeninsulaarea(easttotheScandinavianPeninsula)propagateeastwardandsoutheastward.Theeastwardpropagatingwavesbecomestrengthened(weakened)afterturningsoutheastwardneartheUralMountainsandthenenteringtheAsiansubtropicalwesterlyjetstream(ASWJS)overtheCaspianSea-AralSea-Xinjiang.Thesoutheastwardpropagatingwavesalsostrengthen(weaken)afterdirectlyenteringtheASWJSovertheeasternMediterranean-theBlackSea.Furthermore,thedivergenceofEPfluxesovertheMediterraneanalsostrengthens(weakens)inthestrong(weak)years,sotheyjointlybringaboutthestrong(weak)RWAalongtheWAJS.Finally,thepertur-bationavailablepotentialenergy(PAPE)alongtheWAJS(15°-60°E)producedbydiabaticheating,isfargreaterthantheconversionfromthekineticenergyofthebasicflowintotheperturbationkineticenergyandfromtheavailablepotentialenergyofthebasicflowintoPAPE.TheRWAalongtheWA