The Tropospheric Ozone Assessment Report -...

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