AtmosphericcompositionintheCommunityEarthSystemModel(CESM)

Jean-FrançoisLamarqueCESMChiefScientist

NationalCenterforAtmosphericResearch

CESM2components

2IGC8May32017

TobereleasedinJune2017

CouplingGeos-CHEMtoCESM

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GEOS-Chem

CAM5.5

June2015

CLUBB

CLUBB

ZM

MG2

CLUBB

RRTMG

MAM4

FV

CAM5.4

May2015UW

UW

ZM

MG2

Park

RRTMG

MAM4

FV

Model CAM4CCSM4

CAM5.1CESM1.0.3

CAM5.3CESM1.2.0

Release Apr2010 June2011 June2013PBL HB UW UW

Shallowconv. Hack UW UW

Deepconv. ZM ZM ZM

Microphysics RK MG MG

Macrophysics RK Park Park

Radiation CAMRT RRTMG RRTMG

Aerosols BAM MAM3 MAM3

Dynamics FV FV SE

= New parameterization/dynamics

http://www.cesm.ucar.edu/working_groups/Atmosphere/development/cam6/CAM5.5_panel_rec_Jun15.pdfhttp://www.cesm.ucar.edu/working_groups/Atmosphere/development/cam6/cam5.5-process/

Evolutionofatmospheremodel

4IGC8May32017

CESM2:ComparisontoCESM1LENS

OBSCESM1 CESM2

ImprovementsinIndianOcean,IndianMonsoon&SPCZ

DJF

JJA

PrecipitationClimatology

SlicefromC.Deser 5IGC8May32017

CESM2:ComparisontoCESM1LENSPrecipitation Lines:850-mbU

• LagcorrelationwithIndian-Oceanprecip

• 20-100daybandpassfilter,10S-10N

• 9years,DJFMAM

SlicefromR.Neale IGC8May32017

Madden-JulianOscillation

Lines:OLR 6

CESM

LandIce

SocietalDimensions

Paleo-Climate

SoftwareEngineering

AtmosphereModel

Chemistry-Climate

Polar Climate

WholeAtmosphere

LandModel

BioGeo-Chemistry

OceanModel

ClimateVariability

andChange

CESM Advisory Board

CESM Scientific Steering Committee

CESM ProjectBased on 20+ Years of model development and application

Most working groups have winter/spring meetings. Annual

meeting in June(≈350 participants).

CESM is primarily sponsored by the National Science Foundation with other agencies

CESMGovernance

7www.cesm.ucar.edu

AtmosphericcompositioninCESM(1)

• Allversionsdiscussedhereareusingthesamecodebase,selectingcomponents/physics/…throughcompsets

• Atmosphericverticalextent(standardconfigurations)– Low-top(40km):CAM– High-top(150km):WACCM– Spaceweather(500km):WACCM-X

• Canbeusedinfully-coupled,specifiedSSTs/SICsorspecifieddynamicsconfigurations(usuallyMERRA)->alwayscoupledtolandmodel

• Differentdynamicalcoresavailable:FV/FV3,SE,MPAS

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AtmosphericcompositioninCESM(2)• ChemistryisbasedonMOZARTandisflexibleinitscomplexity(troposphere->ionosphere)

• ChemistryiscoupledtoModalAerosolModel(MAM4/MAM7)->aerosolindirecteffect

• VBSincludedtorepresentSOA• VolcanicaerosolsfromSO2 emissions• SpecifiedemissionsavailablethroughnetCDF files(usuallymonthly,butflexible)

• WetremovalusesNeu andPrather;tiedtohydrologicalcycle

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AtmosphericcompositioninCESM(3)

• Couplingtolandmodel– Drydeposition(O3 impactonstomatalconductance)– Nitrogen(NOy/NHx)depositionimpactscarbon/nitrogencycle– Blackcarbondepositiononsnow– Biogenicemissions(currentlyMEGANv2.1)– Dustemissions– Fireemissions(incl.verticalredistribution,followingM.ValMartin)frominteractivefiremodel

– WetlandCH4 emissions

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AtmosphericcompositioninCESM(4)

• Couplingtoocean(specifiedorinteractive)– Drydeposition– Nitrogendepositionimpactscarbon/nitrogencycle– Blackcarbondepositiononsea-ice– Sea-saltemissions– Halogenemissions(specified-only)– DMS(butnotwithlatestBGC)

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Typicalapplications• Long-termsimulations(historical,future,paleo-climate;e.g.CMIP6)– Changeinemissions,land-use,LLGHGs/ODSs– Internalvariability

• Short-term/campaignsimulations– Specifieddynamics(incl.forecasts)– Dataassimilation(incl.CO/aerosols)throughensembleKalman filterDART

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CMIP6:simulationbreakdown• CESM2-CAM6-1o:≈17,000years• CESM2-WACCM6-1o:≈5,000years

13IGC8May32017

WACCM(fixedSSTs)

CAM(coupled)

BGCspinup Oceanonly

BGCspinup Landonly

500years

200years

WACCM(fixedSSTs)

CAM(coupled)

CAM/MAM4:20+sypd (1o,32L)WACCM:6sypd (1o,70L,228sp.)

Ozone,oxidants,volcanic/strat.aerosols,nitrogendeposition

CESM2Regionalrefinement

Regional-refinementinCAM6(AMIP)withtheSpectralElement(SE)andMPASdynamicalcores(effortledbyA.Gettelman andC.Zarzycki)

14IGC8May32017

Precipitable waterSept23-Oct3,111km->14km

SlidefromC.Zarzycki

Questions?Comments?

MoviefromM.LongandT.Scheitlin

15IGC8May32017

SlidefromC.Deser

16

Internalvariabilityandensemble

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SlidefromC.Deser

17

Internalvariabilityandensemble

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SomenumbersonCESM

• 0.25o, 1o and 2o resolutions

• 30 minute time step (for 1o and 2o)

• 32 atmosphere levels (70 for WACCM)

• 60 ocean levels (0.1o or 1o)

• 25 ground layers

• ~5 million grid boxes at 1o resolution

• >1.5 million lines of computer code

• Data archived (monthly, daily, hourly) for hundreds of geophysical fields

• Utilized by hundreds of scientists all around the world18IGC8May32017

CESM2:ComparisontoCESM1LENS

Nino3.4SSTPower

Spectrum

TooearlytosaywhetherthereareimprovementsoverLENS(needanother

500years)

SlicefromC.Deser 19IGC8May32017