Due to Tropical Cyclone Presence August 1995.ppt

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1、LongwaveCloudForcingDuetoTropicalCyclonePresence:August1995CristyKingWhatIwanttoknowIftropicalcyclone(tropicaldepression,tropicalstorm,andhurricane)cloudcoveraffectstheoutgoinglongwaveradiationDataNOAAInterpolatedOutgoingLongwaveRadiationatTOAfromthe

2、NOAA14satelliteSpatialCoverage:2.5X2.5degreegridDataContinuedSpatial:TropicalAtlantic75Wto20W10Nto30NTemporal:DailyOLRAugust22,1995toAugust31,19954cyclonespresentStormTracks8Humberto9Iris11Karen12LuisAugust27,1995AnomalousOLRThresholdHartmannetal.200

3、1usedathresholdof30W/m^2Teststatisticrevealedat95%confidencelevelarangeof-28

4、30(thethreshold)weobtaintheLWCRFduetothepresenceofthecycloneDistributionofOLRaboutthecore-59.73-49.27-47.58-61.915-55.0933-57.46-50.72-61.65-61.16-70.955-60.41-61.37-54.86-47.42-66.87-120.78-102.25-58.0625-42.67-47.295-76.3683-149.39-104.748-39.355-4

5、5.88-74.02-114.14-98.1-34.195-52.01-70.61-85.51-60.024-30.88-38.26-66.43-42.415-38.83OftotalLWCRF:37%comesfromwithinaradiusof1gridbox(242km)65%comesfromwithinaradiusof2gridboxes(484km)82%comesfromwithinaradiusof3gridboxes(726km)CorrelationTOAOLRw/Sto

6、rmCategory=-.15TD=1TD/TS=1.5TS=2TS/H=2.5H=3TOAOLRw/SST=.23Thisisexpectedbecauseifcorrelationw/SSTwasstrong,wewouldconcludethatthereisnonetLWCRFinducedbythecycloneConclusions/CommentsTropicalcyclonecloudcoverdoessignificantlyaffecttheoutgoinglongwaver

7、adiationSimilarresultswerefoundforall4stormsSWCRFmaybalancetheLWCRFleadingtoaNETCRFcloseto0butSWvaluesareneededonadailytimescaleasopposedtomonthlyContoursofmonthlyOLRwashedoutmuchofthesignal