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ContributionofGGFCtoITRF2020JeanPaulBoyEOSTIPGSStrasbourgFrancejeanp


13AirtidesinERA5BecauseoftheirtemporalresolutionhourlyatmospherictidesS1S2andtheirmodulationsarefullyrepresentedinERA5Figure1and2showrespectivelytheS1andS2tidesamplitudeandphasecomputedfromalmost40yea

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Document on Subject : "ContributionofGGFCtoITRF2020JeanPaulBoyEOSTIPGSStrasbourgFrancejeanp"— Transcript:

1 ContributionofGGFCtoITRF2020Jean-PaulBoy
ContributionofGGFCtoITRF2020Jean-PaulBoyEOST/IPGS,Strasbourg,France.jeanpaul.boy@unistra.frApril9,2021SummaryThedocumentdescribesthecontributionoftheGlobalGeophysicalFluidCenter(productsavailableathttp://loading.u-strasbg.fr/ITRF2020/)tothenextterrestrialreferenceframerealization:ITRF2020(http://itrf.ensg.ign.fr/).1Environmentalmodels1.1ERA5andTUGO-mmodelsWechoosetomodelenvironmentalloa

2 dingcontributionstosurfacedisplacements(
dingcontributionstosurfacedisplacements(North,East,Up),time-variablegravity eld(Stokescoecients)andgeocentermotionsusinglatestECMWF(EuropeanCentreforMedium-rangeWeatherForecasts)reanalysismodelERA5(atmosphericpressure,soil-moistureandsnow)(Hersbachetal.,2020)availablefrom1979athourlyand0:25oresolutionsandTUGO-m(ToulouseUnstruc-turedGridOceanmodel,updateofCarrere&Lyard,2003

3 )barotropicoceanmodelforcedbyERA5surface
)barotropicoceanmodelforcedbyERA5surfacepressureandwinds,athourlyand0:125oresolutions.Athigh-frequencies(periodstypicallybelow1month),TUGO-mismoreaccuratetodescribetheoceanicvariabilitycomparedtotheclassicalinvertedbarometer(IB)assumption.Meminetal.(2020)showedthattherearenosigni cantdi erencesbetweenTUGO-mbarotropicoceanmodelandclassicalbaroclinicoceanmodels(suchasECCOorGL

4 ORYS)atseasonaltimescaleswhencomparedtoG
ORYS)atseasonaltimescaleswhencomparedtoGPSverticaldisplacements.1.2ProductsavailableWeprovidehourlysurfacedisplacements(North,EastandUpcomponents),time-variablegravity eld(Stokescoecients)andgeocentermotionsfor3di erentloadingmodels:ˆERA5atmosphericloadingassuminganinvertedbarometer(IB)oceanresponse.ˆERA5atmosphericandTUGO-minducedoceanicresponseloading.ˆERA5

5 hydrologicalloading(soil-moistureandsnow
hydrologicalloading(soil-moistureandsnow).1 1.3AirtidesinERA5Becauseoftheirtemporalresolution(hourly),atmospherictides(S1,S2andtheirmodulations)arefullyrepresentedinERA5.Figure1and2showrespectivelytheS1andS2tides(amplitudeandphase)computedfromalmost40yearsofERA5surfacepressureandtheRay&Ponte(2003)(RP2003)model,derivedfrom6-hourlyand1:125oECMWFsurfacepressure,currentlyusedintheprocessing

6 ofspacegeodeticdata.Becauseof Figure1:Am
ofspacegeodeticdata.Becauseof Figure1:Amplitude(top)andphase(bottom)ofS1(left)andS2(right)barometrictidescomputedfromhourlyERA5surfacepressure(1980/01-2018/12).itstemporalresolution(6hours),theretrievalofS2tideisbasedontheassumptionofawestwardpropagationat15o=hrvelocity.TheanalysisofthehourlyERA5surfacepressuredatashowsthattheamplitudeoftheS2tidemaybeunderestimatedintheRP2003model,andas

7 lightlymorecomplexspatialstructure.Wecho
lightlymorecomplexspatialstructure.Wechoosetoleavetheairtides(S1,S2andtheirmodulations)inallourproducts,astheyareinbetteragreementwithbarometricrecords(R.Ray,personnalcommunications).WeremovedtheS1,S2andtheirharmonicmodulationsintheTUGO-mmodeltoavoidanydouble-countingwiththegravitationaloceantides.1.4Correctionsofo setsinhydrologyproductsAsmentionedinHersbachetal.(2020)(Section3andT

8 able3),ERA5wasproducedindi erentstre
able3),ERA5wasproducedindi erentstreamstospeeduptheproductionandavailability.Wediscoverthatanystartofanewproductionstreammaycauseapparento setsinthehydrological elds(soil-moistureandsnow);thisisparticularlythecaseofanewEDA(EnsembleofDataAssimilation)system(seeTable3inHersbachetal.,2020).WethencorrectforjumpsoccuringinApril1986,August1993,January2000,January2010andJanuary2015