SLIDE 1 AerosolRemoteSensingfromOMIObservations:AnOverview
OmarTorres
NASAGSFC
ChangwooAhn
SSAI
HirenJethva
GESTARUSRA
2014EOSAuraScienceTeamMeeting 1518September2014,CollegePark,MD
https://ntrs.nasa.gov/search.jsp?R=20150000357 2017-12-09T13:32:26+00:00Z
SLIDE 2 OMINearUVAerosolAlgorithm(OMAERUV)
Purpose:RetrievalofAerosolSingleScatteringAlbedoandAbsorptionOpticalDepth Measurements:Radiancesat354and388nm. PhysicalBasis:RadiativeinteractionbetweenparticleabsorptionandmolecularscatteringintheUV. RetrievalProducts: AODandSSA(388nm) AbsorbingAerosolIndex InversionScheme: ForagivenaerosoltypeandALH,satellitemeasured radiancesat354and388nmareassociatedwitha setofAODandSSAvalues.
Inspitethesensor’scoarseresolutionforaerosolretrieval,valuableinformationonparticle absorptioncanbederivedfromOMInearUVobservations.
Torres,O.etal.,AerosolsandSurfaceUVProductsfromOMIObservations:AnOverview,J.Geophys.Res.,112,D24S47,doi:10.1029/2007JD008809,2007
SLIDE 3 Torres,O.,C.Ahn,andZ.Chen,ImprovementstotheOMINearUVaerosolalgorithmusingAtrainCALIOPandAIRSobservations, Atmos.Meas.Tech., 6,32573270,2013
OMI CALIOP AIRS
CombineduseofOMI,CALIOPandAIRSobservationsinOMAERUVAerosolRetrieval OMAERUVusesaCALIOPbasedAerosolLayerHeightClimatologyandrealtimeAIRS carbonmonoxidedataforaerosoltypeidentification[Torresetal.,2013]
ThecombineduseofAIandCOallowstheidentificationof smokelayersoveraridareas. AIRSCOallowstheidentificationofheavyaerosol loadsoverChina,andotherregions,otherwise undistinguishablefromcloudcontamination. AODJune2007Monthlyaverage
WithoutCO WithCO
SLIDE 4
OMAERUVAODValidation:TheGlobalPicture
Numberofpairsper0.02AODbin.Maximumpairdensity(50to110)showninpink.
Ahn,C.,O.Torres,andH.Jethva(2014),AssessmentofOMInearUVaerosolopticaldepthoverland,J.Geophys.Res.Atmos.,119,2457– 2473,doi:10.1002/2013JD020188.
SLIDE 5 OMAERUVSSAassessment:ComparisonatselectedAERONETsites
Jethva,H.,O.Torres,andC.Ahn(2014),GlobalassessmentofOMIaerosolsinglescatteringalbedousinggroundbasedAERONETinversion, J.Geophys.Res.Atmos.,119,doi:10.1002/2014JD021672.
51%(75%)ofmatchedpairsagreewithin0.03(0.05)
SLIDE 6 OMI versus AERONET Global Composite
- OMIandAERONETarewithintheirexpecteduncertainties(±0.03)forAOD>0.4andUVAI>1.0
- Closeragreementforlargeraerosolloading
6
SLIDE 7
2007AAODGlobalSeasonalAverageMaps
WINTER SPRING SUMMER AUTUMN
SLIDE 8
ValidatedlongtermrecordofOMAERUVAerosolOpticalDepthandSingleScatteringAlbedo DAKAR,SENEGAL(14.4N,17W) OMIAERONETcomparisonofmonthlymeanvaluesofAODandSSAovernineyears
OMAERUVSSA(440) OMAERUVAOD(440)
SLIDE 9
NineyearGlobalrecordofOMIAerosolAbsorptionOpticalDepth
SLIDE 10 SouthernAfrica (5S25S,15E35E) Brazil (5S25S,30W70W)
AAODtimeseriesoverSHbiomassburningregions
AnAAODincrease(~0.01/year)isapparentinSouthernAfrica AAOD=AOD(1SSA) IsAODincreasingorSSAdecreasing?
SLIDE 11 SouthernAfrica (5S25S,15E35E) SouthernAfrica (5S25S,15E35E)
AODandSSAtimeseriesoverSHbiomassburningregions Adecreaseinthewatercontentoffuelcanproducemoreabsorbingparticles
Timeseriesofmonthlyaccumulatedrain(TRMM) MayOct.PrecipitationAnomaly(%)
SLIDE 12
AerosolAbsorptionOpticalDepth AerosolAbsorptionOpticalDepth
Canada Siberia AAODtimeseriesoverNHborealfiresregions
TheobservedhighlatitudeNHincreaseinAAODislikelyassociated withincreasedborealfireactivityinCanada
SLIDE 13 August42007
2.2 1.1 0.0 25 20 15 10 5
Simultaneous Retrieval of Cloud (COD) and Aerosol (AOD) Optical Depth
Inversion Scheme
AOD COD
Torres,O,H.Jethva,andP.K.Bhartia,RetrievalofAerosolOpticalDepthaboveCloudsfromOMIObservations:SensitivityAnalysisandCase Studies,Journal.Atm.Sci.,69,10371053,doi:10.1175/JASD110130.1,2012
SLIDE 14 Summary
Significantprogressonthequantificationofaerosolabsorptionhasbeenachievedduring thefirstdecadeofOMIoperation.
- Atenyeardatasetof388nmAODandSSAhasbeenderivedfromOMIobservations.
- ThecapabilityofretrievingaerosolsabovecloudsusingUV/VISobservationshasbeen
developed. ThedecadalOMIAODandSSArecordshavebeenevaluatedbydirectcomparisonto independentgroundbasedAERONETobservations. TheOMISSAandAAODdatasetsarethefirsteverquantitativemultiyearrecordson aerosolabsorptionfromsatellitebasedobservations. ContinuationoftheOMIrecordonaerosolabsorptionisrequiredforconclusiveanalyses
