简介：Inthisarticle,anewdefinitionfortheNorthHuaiheRiverrainyseason(NHRS)ispresentedusingsummerdailyprecipitationinEastChinaandsubtropicalhighridgeaxisat500hPa.BycalculatingtheannualprecipitationamountsintheNHRSandMeiyuoftheYangtze-HuaiheRiversbasin(YHMY)from1961to2009,thedatesofprecipitationbeginningandendingaswellasthedurationofthetworainyseasonsinthe49yearsareanalyzed.AtmosphericcirculationcharacteristicsinpositiveandnegativeprecipitationanomalyyearsduringtheNHRSarealsostudied.Resultsareshownasfollows.(1)ThenewdefinitionfortheNHRSismucheasiertouse.Itinvolvesonlytwometeorologicalfactors,makingitsapplicationmorepractical.ItcanalsodistinguishtworainyperiodsoftheNHRSmoreobjectively.(2)TheaveragedurationoftheNHRSissimilartothatoftheYHMY,exceptthatitsaveragedatesofbeginningandendingareaboutoneweeklaterthanthoseoftheYHMY.TheaverageprecipitationoftheNHRSisslightlylessthanthatoftheYHMY,andtheyearlyprecipitationvariationofthetworainyseasonsaresimilartoeachotherwithnoobviousincreasingordecreasingtrendinthe49years,butwithdistinguisheddecadalandinter-annualvariations.(3)Inpositiveprecipitationanomalyyears,theSouthAsianhighmovesmorenorthwardandmoreeastward,thewesternPacificsubtropicalhighislocatedmorenorthwardandwestward,andthesummermonsoonisstrongerthannormal,resultingintheconvergenceofthewarmandmoistsouthwesterlyairflowfromthewestsideofthesubtropicalhighandthecoldairfromthenorthsideofthenortheasttroughinNorthHuaiheRiverbasin.

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。

简介：Thetotal15severedroughtsarediscoveredwiththeaidofthe'RetrievalSystemofChineseHistoricalClimateRecords'forthelast1000years.Thedroughtsareextensivetoenvelopemorethan4provincesandpersistenttocover3yrormore,andtheirseverityisequivalenttoorinexcessofthatinthe1930sinChina.Accordingtothedocumentaryrecordsandrestorationsitcanbeinferredthatmostdroughtsaremoreseverethanthoseinthelast50years.The15droughtsmayeitheroccurwarmorinacoldclimatebackground,with11ofthe15casesinthecoldphase.ThisindicatesthedifferenceinclimatecorrespondencebetweenChinaandnorthernAmerica,showingtheseverityoftheeventsinChinatobeinacoldinsteadofawarmclimatesituation.ThatislikelytorelatetothemonsoonclimateineasternAsia.

简介：ElNioorLaNiamanifestinDecemberoverthePacificandwillserveasanindexfortheforecastingofsubsequentIndiansummermonsoon,whichoccursfromJunetomid-September.Inthepresentarticle,anattemptismadetostudythevariationoflatentheatflux(LHF)overthenorthIndianOceanduringstrongElNioandstrongLaNiaandrelateitwithIndianmonsoonrainfall.DuringstrongElNiotheLHFintensityishigherandassociatedwithhigherwindspeedandlowercloudamount.DuringElNioallIndiarainfallishavinganinverserelationwithLHF.SeasonalrainfallishigherinYY+1(subsequentyear)thanYY(yearofoccurrence).HoweverthereisalaginrainfallduringElNioYY+1fromJunetoJulywhencomparedwiththemonthlyrainfall.

简介：统计分析从1949～1996基于历史的记录在过去的50年西北太平洋台风的climatological特征被进行了。学习的目标包括年变化，到季节和紧张的分发，和运动的范畴。另外的调查用台风怎么以在紧张和来源区域之间的产生和关系的地理地点变化做的。大多数强壮的台风在125°E的水东方上发源，这被揭示，与来自马里亚纳群岛的最强壮的组一起。而且，打台风的分发关于季节和纬度被给。在点的中央压力的统计乍见陆地建议在浙江和福建的省上做landfalls的台风不比在华南经常，但是有相对高的紧张。

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简介：ＴＨＥＣＨＡＮＧＥＳＡＮＤＣＬＩＭＡＴＩＣＪＵＭＰＳＩＮＦＥＲＲＥＤＦＲＯＭＴＨＥＡＧＲＩＣＵＬＴＵＲＡＬＤＲＹＮＥＳＳＡＮＤＷＥＴＮＥＳＳＩＮＴＨＥＣＨＡＮＧＪＩＡＮＧ－ＨＵＡＩＨＥＶＡＬＬＥＹＦＯＲＴＨＥＬＡＳＴ５００ＹＥＡＲＳＸｕｅＨｅｎｇ（薛...

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简介：Inthispaper,byusingspectralmethod,themonthly-andseasonal-scaleatmosphericdiabaticheatflow(ADHF)departurefieldsarediagnosedintheperiodof1964—1985with6ElNinoyearsand6anti-ElNinoyearsovertheNorthernhemisphere(NH).TheresultsshowthatElNinophenomenahavepronouncedinfluenceontheADHFdepar-turefields.Theresponseofatmosphereexhibitsapreferredarrangementoforganizingpositiveandnegativedeparturecentersatlow,middleandhighlatitudes.Inanti-ElNinoyears,theresponsehasthesameformsasinElNinoyears,butdeparturecentersareoppositeinphase.Furthermore,ADHFdepartureshowslow-frequencyoscillationinElNinoyearsandanti-ElNinoyears.ThecenterofdifferenceindeparturebetweenElNinoandanti-ElNinoyearsdisplaysabi-monthlyoscillation.Finally,throughair-seacorrelationanalysis,itispointedoutthattheSSTanomalyisthemostimportantcauseforADHFanomaly.

简介：BasedonthedailyprecipitationdataofninestationsrepresentingtheXijiangRivervalleyandtheNationalCenterforEnvironmentalPrediction/NationalCenterforAtmosphericResearch(USA)reanalysisdata,thisstudyusesthewaveletanalysisandband-passfiltermethodstoinvestigatetheatmosphericintraseasonaloscillationcharacteristicsofflood-causingrainstormsinthevalleyduringtheannuallyfirstrainingseasonsin1968,1994,1998,2002and2005.Resultsshowthatthedailyprecipitationinthevalleyexhibitssignificantquasi-biweekly(10to20days)oscillations.Theflood-causingrainstormsinthevalleyweremainlyassociatedwiththeconfluenceoflow-frequencywarmandhumidairflowinthelowerlatitudesandcoldanddryairflowinthehigherlatitudes.Thelow-frequencyvortexeswerepropagatingorincontrolwhenthistypeofrainstormstookplaceoverthevalley,beingfavorablefortheconvergenceofmoistureatlowerlevelsandthusvitaltotheformationoftherainstorms.

简介：UsingtheInternationalComprehensiveOcean-AtmosphereDataSet(ICOADS)andERA-Interimdata,spatialdistributionsofair-seatemperaturedifference(ASTD)intheSouthChinaSea(SCS)forthepast35yearsarecompared,andvariationsofspatialandtemporaldistributionsofASTDinthisregionareaddressedusingempiricalorthogonalfunctiondecompositionandwaveletanalysismethods.TheresultsindicatethatbothICOADSandERA-InterimdatacanreflectactualdistributioncharacteristicsofASTDintheSCS,butvaluesofASTDfromtheERA-InterimdataaresmallerthanthoseoftheICOADSdatainthesameregion.Inaddition,theASTDcharacteristicsfromtheERA-Interimdataarenotobviousinshore.Aseesaw-type,north-southdistributionofASTDisdominantintheSCS;i.e.,apositivepeakinthesouthisassociatedwithanegativepeakinthenorthinNovember,andanegativepeakinthesouthisaccompaniedbyapositivepeakinthenorthduringAprilandMay.InterannualASTDvariationsinsummerorautumnaredecreasing.Thereisaseesaw-typedistributionofASTDbetweenBeibuBayandmostoftheSCSinsummer,andthecenteroflargevaluesisintheNanshaIslandsareainautumn.TheASTDintheSCShasastrongquasi-3aoscillationperiodinallseasons,andaquasi-11aperiodinwinterandspring.TheASTDispositivelycorrelatedwiththeNio3.4indexinsummerandautumnbutnegativelycorrelatedinspringandwinter.