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@InProceedings{BritoEsco:2014:VCAsOc,
               author = "Brito, Bruno Miranda de and Escobar, Gustavo Carlos Juan",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "VCAN associado com a ocorr{\^e}ncia de tempo severo no NEB em 
                         novembro de 2013",
            booktitle = "Anais...",
                 year = "2014",
         organization = "Congresso Brasileiro de Meteorologia, 18.",
             abstract = "
                         TheactingofanUpperLevelCyclonicVortex(ULCV),whichoccurredfromNovember2-6,2013,wasresponsibleforsevereweatherinmuchofNortheastBrazil(NEB).Atsomelocationsextremeprecipitationwasrecorded,suchas,forexample,inAracaju,Sergipe,wheremorethan130mmwereregisteredbetweenNovember3rdand4th.Theactingofthisatmosphericsystemassistedinbothpositiveandnegativeways.Inthefirstcase,partofNEBwaspunishedbydryweather,whichwasconsideredtheworstdroughtin65yearsduetothelowquantityandpoordistributionofrain.Thenegativeeffectaroseduetointenseprecipitationinisolatedlocations,inadditiontomanylightningflashes,strongwindandhailthatcausedimpactsontheaffectedsociety.Amongtheseimpacts,thefollowingstoodout:floods,fallentrees,roofdamagetohousesandfamilieswholosttheirhomes.Duetotheimpactsthatthisatmosphericphenomenonimposedonthepopulation,andalsobecauseitwaspredictedbyCPTEC/INPEthroughthepreparationofmeteorologicalwarnings,themotivationarosetoformthecurrentcasestudy.TheobjectiveofthisworkistoconductasynopticanalysisoftheextremeprecipitationeventthatoccurredinNEBduetotheactingofanULCV.ThisstudyalsoaimstoevaluatetheprecipitationfieldspredictedbythedifferentoperationalnumericalweatherpredictionmodelsatCPTEC/INPE(ETA15km,GFS,BRAMS5km,G3DVARandGlobalT299L64).Forthesynopticanalysis,satelliteimagesfromtheIR(enhanced)andwatervaporchannels,synopticchartsat250,500,700and850hPaproducedbyCPTEC/INPEandradiosoundingsfromNatal,RN,Recife,PEandSalvador,BAwereutilized.TheresultsshowedtheactingofanintensePalmertypeULCVinNEBforaperiodofapproximatelythreedays.Thecycloniccirculationassociatedwiththislowpressuresystemwasverifiedinthemiddleanduppertroposphereusingthe700,500and250hPalevels.InthecenteroftheULCVacoldcoreof-15°Cwasobservedat500hPa,whichcontributedtoalargerverticaltemperaturegradient(lapserate),favoringtheproductionofhailatsomelocationsinthestatesofAlagoas,RioGrandedoNorte,BahiaandSergipe.Theinstabilityindicespresentedvaluesthatindicatedpotentialforstrongconvection,intenseprecipitationandthunder.Convective-typecloudinesswasobservedprincipallyinthevicinityofthevortexcenter,duetothepresenceofthecoldcoreinthemiddlelevelsoftheatmosphere.Finally,ingeneralthenumericalweatherpredictionmodelsunderestimatedtheaccumulatedrainfallmeasuredbyraingaugesinareasofSergipe,althoughtheETA15kmmodelpresentedthebestresultwith 
                         relationtotheintenserainregisteredonthecoastofthisstate. x.",
  conference-location = "Recife, PE",
      conference-year = "3-6 nov., 2014.",
        urlaccessdate = "28 mar. 2024"
}


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