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TheTroposphericOzoneAssessmentReport:Quantifyingtheglobaldistributionandtrendsoftroposphericozoneusingsatelliteinstruments
BriceBarret,Laboratoire d’Aérologie,Toulouse
OwenCooperandAudreyGaudel,CooperativeInstituteforResearchinEnvironmentalSciences,UniversityofColorado,Boulder,USA;NOAAEarthSystemResearchLaboratory,Boulder,ColoradoHelenWorden,NCAR,BoulderCathyClerbaux,LATMOS/IPSL,CatherineWespes,P.-F.Coheur andDanielHurtmans ,Université Libre deBruxellesEricLeFlochmoen,Valérie Thouret andHervé Petetin ,Laboratoire d’Aérologie/OMP,ToulouseGaelle Dufour andJuanCuesta,LISA/IPSL,ParisJerryZiemke,NASAGoddardSpaceFlightCenterandMorganStateUniversity,Baltimore,Maryland,USAGuanyu HuangandXiong LiuatHarvard-SmithsonianCenterforAstrophysicsRichardSiddans andBrianKerridge,RutherfordAppletonLaboratoryAlexeiRozanov andNabiz Rahpoe atInstituteofEnvironmentalPhysics,UniversityofBremen,GermanyMartinSchultz,Forschungszentrum Juelich
Pleasenote:
AllfiguresshowingTOARanalysesarepreliminaryandthereforeshouldnotbecited.
Finalfigureswillbeavailableafterthereporthasbeenacceptedforpublicationbythepeer-reviewedjournal,Elementa:ScienceoftheAnthropocene.
TroposphericOzoneAssessmentReport(TOAR)Globalmetricsforclimatechange,humanhealthandcrop/ecosystemresearch
Mission:Toprovidetheresearchcommunitywithanup-to-datescientificassessmentoftroposphericozone’sglobaldistributionandtrendsfromthesurfacetothetropopause.
Deliverables:1)Thefirsttroposphericozoneassessmentreportbasedonallavailablesurfaceobservations,
thepeer-reviewedliteratureandnewanalyses.2)Adatabasecontainingozoneexposureanddosemetricsatthousandsofmeasurementsites
aroundtheworld,freelyaccessibleforresearchontheglobal-scaleimpactofozoneonclimate,humanhealthandcrop/ecosystemproductivity.
http://www.igacproject.org/activities/TOAR
Stakeholders:
TOAROrganization
TOARisascienceeffortinitiatedbyIGAC,anddevelopedbyaninternationalteamofexperts.
TOARreceivesfinancialandlogisticalsupportfrom:
- IGAC
- Forschungszentrum Jülich
- TheWorldMeteorologicalOrganization
- USNationalOceanicandAtmosphericAdministration(NOAA)
TOARmembers:220+scientistsfrom36nations,representingresearchonall7continents
TOARDatabase
TOARhasbuilttheworld’slargestdatabaseofozonemetrics.
DevelopedbyForschungszentrumJülich: MartinSchultz,SnehalWaychal,SabineSchröder,OlgaLyapina andMichaelDecker
Ozoneobservationsfromover9000monitoringsitesindozensofcountries
Increaseofdaytimeaverageozonebetween2000-2014inNHwinter
1374non-urbansitesinDJF
1784non-urbansitesinJJA
Decreaseofdaytimeaverageozonebetween2000-2014inNHsummer
MAM SON
Increaseofdaytimeaverageozonebetween2000-2014allseasonsoverEastAsia
DJF MAM JJA SON
Frankfurt
NE-USA
NE-ChinaKorea
SEAsia(+O3sondes)
SouthIndia
+11% +1%
+7%
+14%
+45%
+31%+20%
+70%
+15%+8%
+32%
+25%+12%
+12%
+4%
+5%-2%
+3%0%+7%
Asia:- increase for all seasonsand regions- largest increases (up to70%) fromMAM to SON
- 1994-2004- 2005-2014
IAGOS Ozone profiles
W Europe and NE USA:- significative increase inwinter- nul to negative trend insummer
Product name and institution Horizontal resolution
Horizontal coverage Vertical range(tropopause definition)
Temporal resolution/time of day
Record length
OMI/MLSNASA GSFC
1° × 1.25° 60°S - 60°N Surface to tropopause(WMO 2 K km-1 lapse-rate)
Monthly/Seasonal
13:45
2004 – 2016, continuing
GOME & OMIHarvard-Smithsonian Center for
Astrophysics (HSCfA)
1° × 1.25° 60°S - 60°N Surface to tropopause(WMO 2 K km-1 lapse-rate)
Monthly/SeasonalOMI: 13:45
GOME: ??:??
1995 – 2015, continuing
OMI-RALRutherford Appleton Laboratory (RAL)
5°x5° 60°S - 60°N Surface to tropopause(WMO 2 K km-1 lapse-rate)
Monthly/Seasonal13h45
1995-2016, continuing
IASI-LISALISA
Averaged over 0.25°x0.25° grids
Regional (Europe, Asia)
Surface-6 and 6-12 km Seasonal 9:30
2008-2014, continuing
IASI+GOME2LISA
5°x 5° Regional (Europe, Asia)
Globalsince 2017
Surface to 3 km, and 3-9 km
Monthly/ seasonal9:30
2009-2010
IASI - FORLIULB and LATMOS/IPSL
12 km footprintAveraged over
5°x 5° grids
90°S-90°N Surface to tropopause(WMO 2 K km-1 lapse-rate)
Seasonal9:30
2008 – 2016
IASI - SOFRIDLA/OMP - Toulouse
12 km footprintAveraged over
5°x 5° grids
80°S-80°N Surface to tropopause(WMO 2 K km-1 lapse-rate)
Seasonal9:30
2008 – 2015, continuing
Tropospheric ColumnOzone(TCO)TOARsatelliteproducts
LISAIASIandIASI+GOME2tropospheric Ozone
ÞIncreased sensitivity to lower troposphereÞ no global retrievals on the whole IASI period for trends calculation
Surface-6kmIASI partialozonecolumns[DU]overEastAsia(2010-2014).
Surface-3kmIASI+GOME2 partialcolumnozoneoverEastAsia(2010)(globalretrievalssince2017/AERISdatacentre).
TCOAveragingKernelsfor 5 global satellite products
JJA
DJF
Land-OceanNH
OceanTropics
Land-OceanSH
Land-OceanNH
OceanTropics
Land-OceanSH
OMIandIASI-Higher sensitivity insummer than inwinter- sensitivity 200-800hPa- little 2010-2011differences
OMI-RAL-Sensitivity downtothesurface-nowinter-summerdifference
TCOannualmeans(DU)fromTOST(sondes)andSatellites(2010-2014)
TOST
OMI
IASI-FORLI
OMI-MLS(+2DU)
OMI-RAL
IASI-SOFRID
MainTCOfeaturescaptured by6products
-high TCOnorthernmid-lat land/oceans
- tropicalwave-1withSouth-AtlanticmaxandcentralPacificmin.
- high TCOfrom AfricatoAustralia overIndian Ocean (lesspronounced inTOST)
OMI-MLS
Satellite
UV-vis
IR
3retrievalsfromOMI
2retrievalsfromIASI
TCOtrendsfromSatellites:discrepancies
IASI-FORLI2008-2016 IASI-SOFRID2008-2015
OMI2005-2015 OMI-RAL2005-2015
OMI/MLS2005-2016
Numberofproductswithstatisticallysignificant
- positive(red)trend- negative(blue)trend
Verynewexcitingresult:
Ozoneburden(2014-2016)from5satelliteproducts:
296Tg ± 4%
TCOfromSatellites:agreement
Tropospheric ozoneburdentrendsSeasonalvariationsconsistentlycapturedby6products
OMI- Globalincrease=1.5-2.8Tg/yr- NHandSH0.3-1.8Tg/yr
IASI- Globaldecrease=1.4-2.1Tg/yr- NHandSH0.5-1Tg/yr
Note:TrendsoverdifferentperiodsConvergenceoverIASIperiod
Conclusions:
1) NHsurfacedata=>significantseasonaltrendswithwinterincreaseandsummerdecrease
2) NHIAGOSprofiles=>increaseoftropospheric O3withlargesttrendsinAsia
3) Satellitedata=>3OMIand2IASIproducts- UV-VisandTIRsensitivetomid-uppertroposphere- OMIandOMI/MLS:globalincrease- IASI-SOFRIDandFORLI:globaldecrease- OMIandIASIconsistenttropical/Asianincrease=>differentperiodsforGOME/OMI,OMI/MLS,IASI-SOFRIDandIASI-FORLIbutrelativeconvergencefortheIASIperiod(Ozoneburdento+/-4%for2014-2016)
Nextsteps:
1) Finishtheassessmentreportandsubmitall8paperstoElementa
2) ReleasethedatabaseofozonemetricstothegeneralpublicinJuly2017
3) Encouragehumanhealth,ecosystemandclimateresearcherstoutilizethedatabasefortheirimpactstudies.
4) Continuecollaborativeresearchtoreconcilethetrenddifferencesbetweensatelliteproducts
5) BeginplanningTOAR-II