Why LST is important for climate applicaonscci.esa.int/sites/default/files/10_Why LST is important...
Transcript of Why LST is important for climate applicaonscci.esa.int/sites/default/files/10_Why LST is important...
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WhyLSTisimportantforclimateapplica5ons
NickRayner,DarrenGhent,LizzieGoodandClaireBulgin
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Contents
• Introduction – why LST is important • General requirements:
– Length of record – Coverage – Homogeneity/stability – Communication of uncertainties
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ImportanceofLSTforclimateapplica5ons• Landsurfacetemperature(orLST)providesavaluablesetofobserva5onsforcharacterisinglandsurfacestatesandland-atmosphereexchange.• Increasinglyrecognisedasanessen5alparameterfordiagnosingEarthSystembehaviourandevalua5ngEarthSystemModels:- providesagloballyconsistentrecordfromsatelliteofclear-sky,radia5vetemperaturesoftheEarth’ssurface- providesacrucialconstraintonsurfaceenergybalances,par5cularlyinmoisture-limitedstates.- providesametricofsurfacestatewhencombinedwithvegeta5onparametersandsoilmoisture,andisrelatedtothedrivingofvegeta5onphenology.
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Modellingofevapotranspira5on
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ImportanceofLSTforclimateapplica5ons• Landsurfacetemperature(orLST)providesavaluablesetofobserva5onsforcharacterisinglandsurfacestatesandland-atmosphereexchange.• Increasinglyrecognisedasanessen5alparameterfordiagnosingEarthSystembehaviourandevalua5ngEarthSystemModels:- animportantsourceofinforma5onforderivingsurfaceairtemperatureinregionswithsparsemeasurementsta5ons,suchaspartsofAfricaandtheArc5c
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Inter-annualvariabilityforsurfaceairtemperatureandsurfaceskin
temperatureSkintemperatureisfromMODISday5meobserva5onat0.05°la5tude/longitude,andairtemperatureismonthlymeanfromGHCN(fromJin&Dickinson,2010)
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ESTIMATINGAIRTEMPERATUREFROMSKINTEMPERATURE
EOBS ECA&D
LizzieGood,MetOfficeHadleyCentre
SatelliteLSATHighest available resolution in-filled air temperature analysis from weather station measurements
Publicly available weather station records
Higher resolution information on air temperature estimated using surface (skin) temperature from satellites Tmin
Tmax
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Lengthofrecord
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RequirementsBaselineDocumentRef.:GlobTemp-WP1.1-DEL-05-i1r0
Needaslongarecordaspossible–atleast30yearsfor“Climate”,e.g.:• Modelevalua5on• A`ribu5onofchangesoverAfrica(lackofinsituhere)• Reconstruc5ngpastairtemperature
Lengthofrecordneeded
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Modelevalua5on/changea`ribu5onEastAfricaSouthernAfrica
Here,surfaceairtemperatureuncertaintyofsameorderasmodelspread–useLSTinstead?
AndyCiavarella,MetOfficeHadleyCentre
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Need for multi-decadal record: calculating changes relative to a baseline
• To assess changes, a baseline must be established • Best station data starts 1920s, but satellite data are only from 1980s – some of this record needs to be used to create the baseline
FraserLo`,MetOfficeHadleyCentre
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Homogeneity/stability
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Homogeneity/stability
• Requirementforstability:• 0.1K/decadeatbreakthrough(GlobTemperatureUserRequ)
• Needconsistent:• sensorcalibra5on
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Homogeneity/stability
• Requirementforstability:• 0.1K/decadeatbreakthrough(GlobTemperatureUserRequ)
• Needconsistent:• sensorcalibra5onandalgorithms• auxiliarydata(earlyATSRauxiliarydatahadinconsistenciesleadingtolargeuncertain5es)
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©ESA–GlobTemperatureConsor7um
DUEGlobTemperature
16
IMPROVEMENTSTOATSRLST• EarlyATSRauxiliarydata(land
coverinformaIon,emissivityinformaIon,atmosphericprofiles)hadinconsistenciesleadingtolargeuncertainIes
• GlobTemperaturehasresolvedtheseissueswithuseofhighspaIalandtemporalresoluIonauxiliarydata
Existing operational
GlobTemp Existing operational
GlobTemp
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Homogeneity/stability
• Requirementforstability:• 0.1K/decadeatbreakthrough(GlobTemperatureUserRequ)
• Needconsistent:• sensorcalibra5onandalgorithms• auxiliarydata• cloudclearing(changingclearskybiases,etc;GlobTemperaturedoingthisforATSRonly)
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ImpactonLSTretrievalsofdifferentautoma5ccloudclearingalgorithms
ClaireBulgin,Univ.Reading
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Homogeneity/stability
• Requirementforstability:• 0.1K/decadeatbreakthrough(GlobTemperatureUserRequ)
• Needconsistent:• sensorcalibra5onandalgorithms• auxiliarydata• cloudclearing(changingclearskybiases,etc.;GlobTemperaturedoingthisforATSRonly)
• Changinguncertain5esduetoinconsistenciesleadstounstablesystem
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Coverageandresolu5on
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RequirementsBaselineDocumentRef.:GlobTemp-WP1.1-DEL-05-i1r0
Notetheneedforglobalproducts,butalsoforcountryandcity-scaleproducts:• Needed,forexample,forpolicy-relatedworkandurbanclimatechangestudies,includingassessmentsofe.g.heatstress
Spa5aldomainneeded
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Heatstressinurbanenvironments
BenedicteDousset
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RequirementsBaselineDocumentRef.:GlobTemp-WP1.1-DEL-05-i1r0
Spa5alresolu5onneeded
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RequirementsBaselineDocumentRef.:GlobTemp-WP1.1-DEL-05-i1r0
Temporalresolu5onneededEUSTACEuserrequirementsanalysisalsoindicatesaneedforinforma5onondailyTmaxandTmin.Thisisimportant,e.g.fortheanalysisofextremes,andclimate-relatedeventa`ribu5on.
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DiurnalcycleobservedbySEVIRIandinsitusta5on60735(3540N,1006E–Tunisia)withapproximatesatelliteoverpass5mes
(Blue=MODIS/Aqua,Yellow=MODIS/Terra,Red=ATSR).Squaresindicate15-minuteSEVIRIobserva5ons.
LizzieGood,MetOfficeHadleyCentre
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Near-globalcoverage(overland)fromMODISinoneday
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DiurnalcycleobservedbySEVIRIandinsitusta5on60735(3540N,1006E–Tunisia)withapproximatesatelliteoverpass5mes
(Blue=MODIS/Aqua,Yellow=MODIS/Terra,Red=ATSR).Squaresindicate15-minuteSEVIRIobserva5ons.
LizzieGood,MetOfficeHadleyCentre
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Temperatureobserva5onsfromtheARMOklahomasiteon16August2014.Cloudhasstronginfluenceontemperature
evolu5on,par5cularlyonLST.
Good(2015),inprepara5on
Duringtheday,LSTismuchwarmerthanairtemperatureinclearskies(16:00-20:00GMT),butthetwoaremuchcloserundercloud(from22:00GMT)
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Coverageandresolu5on• GeneralLSTrequirements:1kmorfinerto0.05°,atleastday/night(GlobTemperatureuserrequs.)
• EUSTACEuserrequirements:dailyTmaxandTmin;consistencywithothersurfaces
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Consistencywithothersurfacesneeded
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Coverageandresolu5on• GeneralLSTrequirements:1kmorfinerto0.05°,atleastday/night(GlobTemperatureuserrequs.)
• EUSTACEuserrequirements:dailyTmaxandTmin;consistencywithothersurfaces
• Globtemperaturelookingates5ma5ngclearskybiasfrommicrowave,butwon’tcovermerging
• Combina5onofsensors(AVHRR,ATSR,MODIS,VIIRS,geosta5onaries,microwave)neededtoachievewhatusersneed
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Communica5onofuncertain5es
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EUSTACEMODISL2UNCERTAINTIESEUSTACE/GlobTemperatureMODISL2Product• Traceableglobally-robustcoefficients• UncertaintyanalysisfromfirstprinciplesUncertainIes• UncertainIescategorisedbyeffectswhoseerrorshavedisInctcorrelaIonproperIes:
Ø Random,e.g.sensornoise,emissivityspecifica5onØ Locallysystema5c,e.g.atmosphericstatespecifica5on,otheremissivity
issuesØ (large-scale)Systema5c,e.g.calibra5oncorrec5ons
• Thisthree-componentmodelcanbeappliedtoallprocessinglevelsandLSTproducts• PropagaIonofuncertainIes:
Ø L1 L2 L3 L4(MergedProduct)
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EUSTACEMODISL2UNCERTAINTIESOVERWESTERNRUSSIA
Randomeffects Locally-correlatedeffects
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Othercommunica5onneeds
• Guidanceforuserstoenablethemtousethedataintheircontext,e.g.canyousubs5tuteLSTanomalyforsurfaceairtemperatureanomaly?
• Guidanceonuncertain5es• Rela5onshiptomodelskintemperatures
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Summary• LSTisanimportantvariableformanyaspectsofclimateresearchandservicesonglobalandlocalscales
• Inordertomeetclimateusers’needsforlong,homogeneous,sub-daily,<0.05°resolu5oninforma5onwithsplituncertaintycomponents,acombina5onofallavailablesensortypesisneeded
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Extraslides
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EUSTACEAIMSEUSTACEwillgivepubliclyavailabledailyesImatesofsurfaceairtemperaturesince1850acrosstheglobeforthefirstImebycombiningsurfaceandsatellitedatausingnovelstaIsIcaltechniques.Todothis,weneedto:• Iden5fynon-clima5cdiscon5nui5esindailyweathersta5ondata,souserscantrustthechangesourrecordsshow• Produceconsistentuncertaintyes5matesforsatelliteskintemperatureretrievalsoverallsurfaces(land,ocean,iceandlakes),soweknowhowfartotrustthees7mateseverywhere• Understandhowsurfacetemperaturemeasuredinsituandbysatelliterelates,toes7mateairfromskintemperature• Es5matevaluesinareaswherewehavenoinsituorsatellitedata,souserscanhavedailyinforma7onhere
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ESTIMATINGAIRTEMPERATUREFROMSKINTEMPERATURE
Satellitevariables,includingskin
temperatureandvegeta5on
Sta5cdatasets(la5tude,eleva5on)
Observedsta5onairtemperatur
e
Regressionmodel(perdayforspecificregion)
Airtemperaturees5matedforeverycloud-
freesatellitepixel