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199 个结果
  • 简介:基于观察分析,七个数字实验被设计由NCARCCM3在东方中国和相关物理机制上在夏天降水上学习和平的SSTA的影响。数字模拟结果证明在自台湾东面的菲律宾海流向日本的暖流区域的前面的冬季SSTA由在东方亚洲和中间高度的纬度上修改大气的一般循环在长江山谷上导致夏天降水异例。向西和平的副热带的高度被在中间和东方上先于春天SSTA显著地影响。赤道太平洋;在相应时期的中间的纬度的中央区域的SSTA引起在东方中国上的夏天降雨异例以便触发大气的欧亚大陆和平的电视连接模式。

  • 标签: 太平洋 中国 夏季 降水 数字模拟
  • 简介:ThisstudyexaminesthemodulationoftropicalcyclogenesisovertheSouthChinaSea(SCS)bytheElNio-SouthernOscillation(ENSO)Modokiduringtheborealsummer.Resultsrevealthatthereweremoretropicalcyclones(TCs)formedovertheSCSduringcentralPacificwarmingyearsandlessTCfrequencyduringcentralPacificcoolingyears.Howdifferentenvironmentalfactors(includinglow-levelrelativevorticity,mid-levelrelativehumidity,verticalwindshear,andpotentialintensity)contributetothisinfluenceisinvestigated,usingagenesispotential(GP)indexdevelopedbyEmanuelandNolan.CompositeanomaliesoftheGPindexareproducedforcentralPacificwarmingandcoolingyearsseparately,whichcouldaccountforthechangesofTCfrequencyovertheSCSindifferentENSOModokiphases.Thedegreeofcontributionbyeachfactorisdeterminedquantitativelybyproducingcompositesofmodifiedindicesinwhichonlyoneofthecontributingfactorsvaries,withtheotherssettoclimatology.Theresultssuggestthattheverticalwindshearandlow-levelrelativevorticity,whichareassociatedwiththeENSOModoki-inducedanomalouscirculationsinMatsuno-Gillpatterns,makethelargestcontributionstotheENSOModokimodulationoftropicalcyclogenesisovertheSCSasimpliedbytheGPindex.TheseresultshighlighttheimportantrolesofdynamicfactorsinthemodulationofTCfrequencyovertheSCSbytheENSOModokiduringtheborealsummer.

  • 标签: ENSO 中国南海 热带气旋 北半球 调制 夏季
  • 简介:VariationsinGuangzhou’saerosolopticalcharacteristicsandtheirpossiblecausesarestudiedagainstthelarge-scalebackgroundofSouthChinaSeasummermonsoons(SCSSM)usingaerosoldataderivedfromPanyuAtmosphericCompositionWatchStationinGuangzhouandtheNationalCentersforEnvironmentalPrediction/NationalCenterforAtmosphericResearch(USA).Thedataisreanalyzedtodevelopacompositeanalysisandperformphysicaldiagnoses.AnalysisoftheresultsshowsthataerosolextinctioninGuangzhoufirstincreasesthendecreasesduringtheactiveperiodofaSCSSM,withvariationsinthestratificationoftheplanetaryboundarylayer(PBL)andenvironmentalwindsplayingimportantrolesinaffectingGuangzhou’saerosolopticalcharacteristics.RegionaldiabaticheatingandanomalouscycloniccirculationsexcitedbymonsoonconvectioninduceenvironmentalwindanomaliesthatsignificantlymodifythestratificationofthePBL.

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  • 简介:由使用常规气象学的数据,物理数量域,卫星图画和Doppler雷达回波数据,我们分析中央规模特征和在云南的重降水进程在早夏天在海湾上由暴风雨引起了的4successive的条件。结果证明在海湾上的暴风雨的生活是平常的2或3天和暴风雨的云顶温度总是在-65℃下面。在海湾上的暴风雨影响云南bymesoscale对疗簇,在外设的云系或削弱搬到东北的本身。西藏的高原砍线和旋涡,NE-SW集中隧道和西南风集中供应有利发行量背景和动态条件。关于Doppler雷达回波有许多普通特征,有关于到东方到的35-45dBZmove的紧张的絮凝的回响在云南生产连续降水,并且中央与高度放大西南喷气和风V字形物戒指的特征不仅是有利的搬运暴风雨在海湾上带到北方的温暖、潮湿的气流,而且对对流开发有利。

  • 标签: 孟加拉湾 暴风 重降水 中尺度分析
  • 简介:TheSouthChinaSea(SCS)andtheArabianSea(AS)arebothlocatedroughlyinthenorthtropicalzonewitharangeofsimilarlatitude(0°–24°N).Monsoonwindsplaysimilarrolesintheupperoceaniccirculationsofthebothseas.Butthedistinctpatternsofchlorophylla(Chla)concentrationareobservedbetweentheSCSandtheAS.TheChlaconcentrationintheSCSisgenerallylowerthanthatintheASinsummer(June–August);thesummerChlaconcentrationintheASshowsstrongerinterannualvariation,comparedwiththatintheSCS;Moderateresolutionimagingspectroradiometer(MODIS)-deriveddatapresenthigheratmosphericaerosoldepositionandstrongerwindspeedintheAS.Andithasalsobeenfoundthatgoodcorrelationsexistbetweentheindexofthedustprecipitationindicatedbyaerosolopticalthickness(AOT)andtheChlaconcentration,orbetweenwindandChlaconcentration.TheseimplythatthewindandthedustprecipitationbringmorenutrientsintotheASfromthesky,thesub-layerorcoastregions,inducinghigherChlaconcentration.TheresultsindicatethatthewindvelocityandthedustprecipitationcanplayimportantrolesintheChlaconcentrationfortheASandtheSCSinsummer.HoweveraerosolimpactisweakonthebiologicalproductivityinthewestSCSandwind-inducedupwellingisthemainsource.

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  • 简介:Theresultsoftwoballoonsoundingsduringthesummerandautumnof1993fromtheXiangheObservationStationarebeingutilizedinastudyofthetemporalandspatialdistributionoftheatmosphericaerosols.Theballoon,gondola,instrumentationandatmosphericconditionsduringtheobservationperiodaredescribed.Thetemporalandspatialcharacteristicsofaerosolconcentration,sizeratio,mixingratio,andsizedistributionforbothtroposphereandstrato-spherearepresentedandanalyzed.

  • 标签: AEROSOL troposphere STRATOSPHERE BALLOON
  • 简介:夏天从1961~2004的Qinghai西藏高原上的97个气象学的车站的逐日的降水数据被选择通过积累的变化分析时间空间的分发,关联分析,回归分析,empir

  • 标签: 1961—2004年 青藏高原 夏季 降水 时空分布
  • 简介:appendicularians上的桡脚类的动物的潜在的抑制在领域和试验性的条件里被发现。appendicularians和planktonic桡脚类的动物的丰富和分发在华南海(SCS)的西北大陆人架上在夏天期间与他们的关联的参考被学习。基于地形学和调查区域的水质量,它被划分成三个分区:区域我(东方Leizhou半岛的沿海的水)与低温度,咸度和高叶绿素一(Chl一)集中,有低温度的区域II(东方的沿海的水和东南海南岛),高咸度和中等Chl集中和区域III(近海从Leizhou半岛流水到海南岛)与高温度,高咸度和低Chl集中。appendicularians和桡脚类的动物的种类丰富增加了从对沿海近海水,和高价值在区域III被观察。appendicularian和桡脚类的动物丰富的分发通常减少了从对沿海近海水,与最高的价值在区域我。我们的结果建议appendicularians和桡脚类的动物的分发模式显著地不同,由于物理、生物的因素的影响。appendicularians上的远洋的桡脚类的动物的否定影响没被发现基于在在SCS的西北大陆人架中的situ数据。

  • 标签: 浮游桡足类 中国南海 分布格局 大陆架 西北 夏季
  • 简介:WepresentamodelforpredictingsummertimesurfaceairtemperatureinNortheastChina(NESSAT)usingayear-to-yearincrementalapproach.Thepredictedvalueforeachyear'sincreaseordecreaseofNESSATisaddedtotheobservedvaluewithinaparticularyeartoyieldthenetforecastNESSAT.Theseasonalforecastmodelfortheyear-to-yearincrementsofNESSATisconstructedbasedondatafrom1975-2007.Fivepredictorsareused:anindexforseaicecoverovertheEastSiberianSea,anindexforcentralPacifictropicalseasurfacetemperature,twohighlatitudecirculationindices,aswellasaNorthAmericanpressureindex.AllpredictorsareavailablebynolaterthanMarch,whichallowsforcompilationofaseasonalforecastwithatwo-monthleadtime.ThepredictionmodelaccuratelycapturestheinterannualvariationsofNESSATduring1977-2007withacorrelationcoefficientbetweenthepredictedandobservedNESSATof0.87(accountingfor76%oftotalvariance)andameanabsoluteerror(MAE)of0.3℃.Across-validationtestduring1977-2008demonstratesthatthemodelhasgoodpredictiveskill,withMAEof0.4℃andacorrelationcoefficientbetweenthepredictedandobservedNESSATof0.76.

  • 标签: 夏季高温季节 中国东北地区 预测值 预测模型 平均绝对误差 相关系数
  • 简介:我们在东亚(EA)上在夏天intraseasonal摆动(ISO)的27年的强迫的模拟评估GAMIL1.1.1的表演西方的诺思太平洋(WNP)。评价基于二项措施:climatologicalISO(CISO)和短暂ISO(TISO)。CISO是对年度周期锁阶段并且描述季节的行军的ISO部件。TISO是逐年变化的ISO部件。模型相当捕获ISO的许多观察特征,包括逐步向北方CISO的雨带进展,在华南海菲律宾的海(SCS-PS)和长江盆(YRB)的TISO的主导的频率,向北方3050天的TISO的繁殖并且向西在SCS-PS上的1225天的TISO模式的繁殖,和在YRB上的三个主要TISO模式的带的宣传特征。然而,模型有著名缺乏。这些包括与CISO联系的华南海季风的早发作,太快向北方到40°N和10°N的CISO信号南方的缺席的从20°N的CISO的繁殖,3050天的TISO模式的缺乏的东方繁殖和在YRBTISO模式的向南方的繁殖的缺席。作者发现在ISO模拟的缺乏是仔细与模型在平均数的偏爱有关说,建议模型的改进意味着状态为intraseasonal变化的现实主义的模拟是关键的。

  • 标签: 西北太平洋 季内振荡 模拟 夏季 东亚 传播特征
  • 简介:东方亚洲冬季季风(EAWM)的可变性能被划分成ENSO相关的部分(EAWMEN)和ENSO无关的部分(EAWMres)。在腐烂的关系ENSO上演的ENSO东方亚洲夏天季风(EASM)上的EAWMres的影响在现在的学习被调查。完成这,ENSO基于EAWMres被划分成四个组:(1)弱EAWMres-ElNi?o(WEAWMres在);(2)强壮的EAWMres-ElNi?o(SEAWMres-在);(3)弱EAWMres-LaNi?一(WEAWMres行);(4)强壮的EAWMres-LaNi?一(SEAWMres行)。合成结果证明EAWMres可以为WEAWMres在和SEAWMres行在东亚上提高大气的回答到ENSO。相应低级逆旋风(气旋)在西方的诺思太平洋(WNP)上的异例把Ni与El联系了?o(LaNi?一)趋于强壮。重要地,这个特征可以坚持直到下列夏天,引起在为WEAWMres在案例的北中国并且在为SEAWMres行案例的西南的中国的丰富的降雨。为SEAWMres在和WEAWMres行组,相反,EAWMres趋于削弱与ElNi联系的大气的发行量异例?o或LaNi?一。在这些,情况,异常WNP反气旋或气旋趋于被减少并且限制了降低纬度,它为WEAWMres行为SEAWMres在并且在西南的中国在北中国导致缺乏的夏天降雨。进一步的学习建议异常EAWMres可以在热带以外的海表面温度异例上有效果,它坚持直到随后的夏天并且可以防碍ENSO的影响。

  • 标签: 东亚冬季风 东亚夏季风 ENSO 干扰 大气环流异常 中国西南地区
  • 简介:Theimportanteffectsoflocalland-seathermodynamiccontrastbetweentheSouthChinaSea(SCS)andIndochinaPeninsulaonSCSsummermonsoononsetarepreliminarilystudiedbyusingtwosetsofSSTAtestsandtwoidealtestsinregionalclimatemodel.TheresultshowsthatwarmSSTintheSCSinwinterandspringisfavorablefortheformationofmonsooncirculationthroughoutalllevelsoftheatmosphereoverthesea,whichhastenstheonsetofSCSsummermonsoon.TheeffectsofcoldSSTaregenerallytheopposite.Thelocalland-seacontrastintheSCSisoneofthepossiblereasonsforSCSsummermonsoononset.Superposeduponlarge-scaleland-seathermodynamicdifferences,itfacilitatestheformationofout-breakingonsetcharacteristicsofSCSsummermonsoonintheSCSarea.

  • 标签: 海陆热力学对比 数值模拟 SCS 夏季风 区域性气候模型
  • 简介:ByusingNCEPGODASmonthlyseasurfaceheight(SSH)and160-stationmonthlyprecipitationdatainChina,theseasonalandinterannualcharacteristicsofSSHareanalyzedoverthetropicalPacific,andcorrelationsbetweenSSHandsummerrainfallarediscussed.Theresultsareshownasfollows:(1)ThetropicalPacificSSHtakesona'V'patternintheclimaticfieldwithaneastwardopening,anditishigherinthewesternpart(inthenorthwesternpart)thanintheeasternpart(inthesouthwesternpart).Thehigh-valueareasaremorestableinthenorthwest,andthevaluerange(greaterthan0.8m)islargerinspringandsummerthaninautumnandwinter.Thehigh-valueareainthesouthwesternpartisthelargest(smallest)andmorenortherly(southerly)inspring(summer).SSHishigherinspringandautumnthaninsummerandwinterovertheequatorialzone.(2)TheinterannualanomaliesoftheSSHarethestrongestoverthetropicalwesternandsouthwesternPacificandarestrongerinwinterandspringthaninsummerandautumn.TheinterannualanomaliesarealsostrongovertheequatorialmiddleandeasternPacific.Thedistributionrangesarelargerandtheintensitiesarestrongerintheautumnandwinter.ThereisacloserelationshipbetweentheSSHinterannualanomaliesandENSOeventsinautumn,winterandspring.(3)WhenENSOeventstakeplaceinwinter,accordingtothesimultaneousrelationshipamongthetropicPacificSSH,850hPawindfieldsandthesummerprecipitationofChina,itcanbepredictedthattheprecipitationwillbesignificantlymorethannormaloverthesouthoftheYangtzeRiver,especiallyoverDongtingLakeandPoyangLakeregion,easternQinghai-TibetPlateau,Yangtze-HuaiRiverValley,easternpartofInnerMongoliaandlessthannormalovertheareaofGreatBandofYellowRiver,NorthChinaandSouthChinainsuccessivesummers.

  • 标签: sea surface HEIGHT INTERANNUAL ANOMALIES tropical
  • 简介:南方亚洲人夏季风(SASM)是为亚洲的季风系统的一个重要成员。它在SouthernHemisphere高由Mascarene的低级分系统组成,跨equatorial索马里人急流,850-hPa在阿拉伯的海上的西的喷气,通过西方印度的孟加拉的海湾的Indianmonsoon马槽北方并且上层热带在东方高在5°N和南亚集中的喷气在30点集中了°N。在夏季风期间,传送对流在南亚是强烈的,与大规模并且与从冷凝作用的潜伏的热版本的丰富的数量联合。

  • 标签: 南压夏季季风 阿拉伯海 SST SASM
  • 简介:AimtolinkingthevariabilityofdroughtinnorthwestChinatotheoceanicinfluenceofNorthAtlanticSSTsatthebackgroundofglobalwarmingandattheregionalclimatechangeshiftingstages,yeararidityindexvariationsinnorthwestChinaandsummerNorthAtlanticseasurfacetemperature(SST)variationsareexaminedforthe44aperiodof1961-2004usingsingularvaluedecomposition(SVD)analysis.ResultsshowthattheSSTanomalies(SSTA)intheNorthAtlanticinsummerreflectedthreebasicmodels.ThefirstSVDmodeofSSTpatternshowsadipole-likevariationwiththepositivecenterlocatedatsouthwestandnegativecenteratnortheastofextratropicalNorthAtlantic.AnditstronglyrelatestothepositivetrendinAIvariationinnorthwestChina.ThesecondcoupledmodesdisplaythecoherentpositiveanomaliesinextratropicalNorthAtlanticSSTandthemarkedoppositetrendofAIvariabilitybetweennorthandsouthofXinjiang.Inaddition,thelagcorrelationanalysisofthefirstmodeofSSTAandgeopotentialheightsat500hPavariationsalsoshowsthattheindicationoftheformerinfluencingthelatterconfiguration,whichresultinhigherairtemperatureandlessprecipitationwhentheSSTAintheNorthAtlanticOceaninsummermotivatedEurasiancirculationofEApattern,furthertoinfluencethewet-dryvariationsinnorthwestChinabytheocean-to-atmosphereforcing.

  • 标签: 干燥度 SSTA 远程并置对比 SVD 中国