the green-oawl (groawl) airborne demonstrator f or the...

TheGreen-OAWL(GrOAWL)AirborneDemonstratorfortheATHENA-OAWLMissionConcept:SystemProgressandFlightPlans

InternationalWindsWorkingGroupWorkshop

27June– 1July2016Monterey,CA

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SaraTucker– BallAerospace

MikeHardesty&SunilBaidar–NOAA/CIRES/CU

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Space-BasedWindMeasurements

¨ Needmorewindobservationstofeednumericalweatherpredictionforecastmodels¤ Bakeretal.BAMS,2014

¨ GlobalObservingSystemPP massobservationsP watervaporq windprofiles (kinematics)overoceans

(esp.tropics)

¨ Aspace-basedDWLsystemwouldprovide§ Directmeasurementsofaltitude-

resolvedwindprofiles§ Measurementofconvergence&

divergence

13th International Winds Workshop - Monterey, CA - 26 June -1 July 2016

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Space-basedDopplerWindLidar¨ ESA’sAeolusMission(ADM)– previoustalk¨ >30yearsofNASAandNOAAinvestmentsinwindlidar

technology¤ Advancements:

n Multiplewindlidarmissionconceptsandsystemarchitecturefeasibilitystudies– noneflown

n Multiplegroundandairbornedemonstrationsystemsn AdvancementsinUVandnear-IRlasertechnologyn Model-relatedAdvancements(e.g.OSSE’s)

¤ Challengesn CompetingtechnologieswithinNASAà Hybridsystem

n LaRC:Coherentdetection:2µmwavelengthaerosol backscatter(lowertroposphere/boundary layer)

n GSFC:Directdetection:355nmwavelengthmolecularbackscatter(allaltitudes,lowerprecision)

n Needformorewindscientistsaskingforthedata


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USSpace-basedwindlidar,cont’d

¨ 2007EarthScienceDecadalSurvey:¤ HybridofboththeLaRC &GSFCsystems=highcost¤ Tier3mission

¨ Thirdoption:Directdetection,shortwavelength,aerosollidar¤ 355nm(aerosol+molecular)and/or532nm(aerosol)

¤ ESA’sAeolusmission@355nm:aerosol+molecularchannels,bothdirectdetection

¤ ATHENA-OAWLconcept:532nm,aerosol


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ATHENA-OAWL:AerosolTransport,Hurricanes,andExtra-tropicalNumericalweAther usingtheOpticalAutocovarianceWindLidar

¨ Path-finding science for next-generation global weather prediction and climate analysis

¨ Design to cost approach to Earth Venture Instrument call building on CALIPSO (now 10 years on orbit) and ISS technologies

¨ Mission Objectives: Co-located wind and aerosol profiles ¤ breakthroughs in modeling and prediction of low and

mid-latitude weather and climate.¤ better understand relationships between aerosol

radiative forcing, atmospheric dynamics and the genesis and lifecycle of tropical cyclones

¤ study impacts of long-range dust and aerosol transport on global energy and water cycles, air quality, and climate.


ATHENA-OAWL

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Two-look,space-basedwindlidar

RAM direction

ISS GroundTrack


Beamspointoff-nadirat40º.

Forward+Aftviewsseparatedby90º(±45ºfromcross-track)

ISS RamDirection

Nadir View

Solar ArraySolar

Array

Earth

30°

60°

90°

ATHENA-OAWL Viewing Angles

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OAWLISSCoverage(Example24hours)

ISS Ground TrackATHENA-OAWL Beams Ground TrackRadiosonde locations


10s/~72km accumulation à2400-4000+ wind profiles/24-hrs

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ATHENA-OAWLVentureTech(AOVT)TheGreen-OAWLAirborneDemonstrator

¨ ATHENA-OAWL EV-I2013MissionConceptwasratedCategory3

¨ ThuseligibleforEV-I“VentureTech”funding.

¨ AOVT Goals¤ UpdateOAWLtoatwo-look,532nm

“GreenOAWL”(GrOAWL)airbornesystem

¤ demonstratemeasurementperformance fromground andaircraft

¤ Providemeasurementvalidation

¤ Scalesystemperformancetospace,(e.g.Aeolus)

¤ RaiseOAWLTRLfornextEV-Iproposal


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OAWL:OpticalAutocovarianceWindLidar

¨ Adirectdetection,aerosol,Dopplerwindlidar…

¨ Operatesatboththe355nm(UV)and532nm(green)wavelengths

¨ Usesafield-widened,quadraturechannel,MachZehnderinterferometertoresolvetheDopplershifts.

¨ Currentconfiguration:¤ Two-look(twolaser,twotelescope)

airbornesystem¤ IntheNASAWB-57

“bomb-bay”pallet¤ Remotelyoperated

Laser Electronics

Fiber coupled OAWL

Interferometer Payload

Controller

Laser-2GPS/ IMUVariable

532 nm output power

Laser-1

2-looks, 2 telescopes


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March/April2016:groundtestingofnewsystemtwolooks(separatedays),twowavelengths


532nm

355nm

30⁰ElevationfacingwestoverBoulderfoothills

Look1:12March2016 Look2:24April2016

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May/June2016:AirborneFlightTesting¨ SystemoperatedremotelyontheNASAWB-57jet

¨ FlewracetrackpatternsovertheGulfofMexicotoprovide¤ Revisittimes:~1hr/loop¤ Viewsoftheatmosphericregionsfromoppositesidesn Morevalidationformodelsn Studyofvariability

¤ Comparisonwithdropsondesforwindsvalidation


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Validationeffort(NOAA/CIRES)¨ ValidationFocusonradiosondes

¤ Balloon-sondes launchedfromNOAANWSstationatCorpusChristi¤ HighDefinitionSoundingSystem(HDSS)dropsondes

n YankeeEnvironmentalSystemswithsupport fromOfficeofNavalResearchn automateddropsonde systemonWB-57n Dropped40+sondes totalovermultiple flights

¨ ComparisonwithNOAAHighResolutionRapidRefresh(HRRR)modelwindsprojectedontotheflightpath


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Simultaneoustwo-lookairborneprofileresults¨ Preliminarydata¨ 532nmwavelengthwithonly300mW perlaser¨ 8.5kmaltitude,12kmslantpathtothesurface¨ Verylowaerosolbackscatterconditions:below“background”¨ Daytimeoperationwithscatteredclouds


Look1(fwd) 17June2016 Look2(aft)

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PreliminaryValidationResults¨ Neitherthedropsonde (HDSS)nor lidar(GrOAWL)dataarefinalized– dataand

comparisonsarepreliminary.¨ Representativenessmustbetakenintoaccountinanycomparison¨ Yet,alreadyseeinggoodcomparisonswithslopefitscloseto1


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ConclusionsandFutureplans

¨ TheGrOAWLairbornedemonstratorhasbeenbuiltwithtwolooks

¨ Initialtwo-lookmeasurementsfromtheNASAWB-57aircraft¤ Post-flightvalidation,evaluation,and

scalingtospacejuststarting¤ Initialvalidationcomparisonsare

promising

¨ Next:Groundvalidationsforaerosoltransportstudies¤ Dualwavelength¤ Depolarizationchannels

¨ NextairbornemeasurementsTBD

¨ 2017:AirborneAeolusCalVal¤ OAWListheonlyU.S.355nm

Aerosolwindlidar¤ Use355nmOAWLforvalidating

Aeolus’355nmaerosolchannel¨ ATHENA-OAWLEarthVenture

Instrumentproposal¨ 2017EarthScienceDecadal

Survey¨ Weneedwindscientistinputs:

¤ Needforwindlidardata¤ Helprefinewindlidarmission

Ground/Airbornemissions Insupportofspacemissions


the green-oawl (groawl) airborne demonstrator f or the...

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