GEMS Kick-Off Meeting, Hamburg Aerosols: WP1

GEMS Kick-Off Meeting, Hamburg

Aerosols: WP1

Jean-Jacques Morcrette, Olivier Boucher

With contributions at ECMWF from:

Soumia Serrar: handling of surface field climatologies

Agathe Untch: implementation of tracers in dynamics

Peter Bechtold: implementation of tracers in convection

Anton Beljaars: implementation of tracers in vertical diffusion

GEMS AEROSOL Global Monitoring System Leader: O. Boucher

GEMS Aerosols• AER_1: Implementation of the direct physical aerosol model in the

ECMWF model (O.Boucher, J. Feichter)

> implementation of parametrisations for tropospheric aerosols

> implementation of parametrisations for stratospheric aerosols

> implementation of new emission inventories

> implementation of aerosol optical properties

> production of test simulations

HC-MO, MPI-M, CEA-LSCE, ECMWF, SA-UPMC • AER_2: Refinement of aerosol emission sources (M.Sofiev)

> update and assimilation of the anthropogenic emission inventories of aerosol and its precursors

> assimilation of information on wild fires

> quantification of the wind-blown dust emission from desert areas

> quantification of the wind-blown sea salt emission

> sources of stratospheric aerosols

FMI, CEA-LSCE, MPI-M, SA-UPMC

GEMS Aerosols• AER_3: Aerosol data assimilation (J-J Morcrette)

> adaptation of RT codes for SW and LW radiances in nadir geometry

> preparation and harmonisation of aerosol satellite data sets

> error covariance matrices

> test of a 1D-Var system using aerosol products

> test of a 1D-Var system using aerosol radiances

ECMWF, CEA-LSCE, HC-MO, SA-UPMC

• AER_4: Evaluation of the model and analyses (C.O’Dowd, I. Chiapello)

> assessment of diagnostics and skill scores

> evaluation of aerosol radiative properties and associated radiative fluxes

> evaluation of aerosol physico-chemical properties

> analysis of model results with respect to air quality

NUIG, CNRS-LOA, CEA-LSCE, DWD, ECMWF, MPI-M, RMIB, SA-UPMC

Agency Mission Instrument Parameters Data volumeper day of satellitelife (Mb)

ESA ENVISAT MERIS AerOpDepth @0.865 ~250 maxAngstrom coefficientRadiances 7 WL

ESA ERS-2 ATSR Radiances used in TBDENVISAT AATSR GLOBAER project

EUMETSAT MSG SEVIRI Radiances low/moderateMSG GERB Radiation budget low/moderate

NASA TERRA MODIS AerOpDepth ~600AQUA Type

Size distributionRadiances

NASA AURA HIRDLS AerOptThickn 4 WL low/moderateNASA SAGE-2 AerOptThickn 8 WL low, available from

SAGE-3 AerOptThickn 8 WL Web

GEMS Aerosols: products @ end of contract

• Analysis of aerosol-related observations at ERA40 resolution (TL159 L60 [1.125 deg]2 or better) twice a day

• Total optical thickness at ~0.55 m OCEAN• Angstrom coefficient (or at~ 0.865m) “• Total optical thickness at ~0.55 m LAND

• From model 12-hour forecasts used in assimilation cycle.Up to 15 mixing ratio profiles of aerosols, every 3 hours

sea salt 3 bins 1st stage desert dust 3 bins organic 2 bins 2nd stage black carbon, carbonaceous 2bins sulfate fly ash “stratospheric” .Corresponding 2D-fields for sources and sinks

GEMS-AEROSOL: initial steps at ECMWF

JJMorcrette, A.Benedetti, S.Serrar, A.Beljaars, P.Bechtold, A.Untch

• Introduce aerosol prognostic variables in the Integrated Forecast System and assimilate global aerosol information

• Instruments: MERIS, MODIS x 2, MISR, SEAWIFS, POLDER• R/T 6S• Modelling LMDZ• Sources/Sinks LMD-Inca• Data Assim. 1DVar• Variables , radiances• Validation AERONET

Development of a prognostic aerosol packagein the ECMWF model

Physics

Radiation

Vertical diffusion

Mass-flux convection

Large-scale condensation

Cloud scheme

Physics with prognostic aerosols

Radiation

Aerosol sources

Dry deposition

Sedimentation

Vertical diffusion

Mass-flux convection

Large-scale condensation

Cloud scheme

Scavenging in- and below clouds

Aerosol budget

Aerosol radiance diagnostics

New routine

Modified routine

Unchanged (at present)

What has been done within the forecast modelas of 20 June 2005

A. Untch: GFL fields (3D): NAERO fields for AerosolsA. Beljaars: GFL in VDiff with t=1800 sP. Bechtold: GFL in mass-flux schemeS. Serrar: Gribbing 2D climate fields for LMD-Inca-type dust


JJMorcrette:

Configuration A: 6 aerosol types from Tegen et al. (1997) climatology moved around by dynamics, VDif, and convection (without sources and sinks)

Mainly used for preliminary testing and background error statistics Stratospheric aerosols to be used this way together with config.B tropospheric aerosols

Configuration B: “real” prognostic aerosols1/ Recomputing most relevant coefficients to have sea-salt and dust with (3,3) bins

instead of (10,2) in LMDZ (optical properties f(RH), deposition)

2/ New routines adapted from LMDZ* AER_SRC: simple sea-salt and dust sources 3 bins each* AER_DRYDEP : dry deposition by modification of source fluxes* AER_SEDIMNT: sedimentation* AER_SCAVIN : scavenging within clouds* AER_SCAVBC : scavenging below clouds

3/ Importing AEROCOM expB climate fields for SS, DU, POM, BC, SU

NB: all the above work is mainly relevant to WP_AER1.1, and WP_AER1.4


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Configuration 1: Sea-salt

Climatology for 1 May

24-hour FC with dyn, vdif, msflx


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Bin 1: 0.03 – 0.5 m

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Surface Sedimentation xx m-2: Sea-Salt bin 1Tuesday 1 May 2001 12UTC ECMWF Forecast t+24 VT: Wednesday 2 May 2001 12UTC Surface: **

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Surface Source xx m-2: Sea-Salt bin 1Tuesday 1 May 2001 12UTC ECMWF Forecast t+24 VT: Wednesday 2 May 2001 12UTC Surface: **

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Configuration B: sea salt a la LMD-Z

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What still has to be done within the forecast modelas of 20 June 2005

• Software/Scientific problems expected to be solved within 1/2 month(s)

within ECMWF

– Find and correct the remaining problems in AER_SCAVIN, AER_SCAVBC

– Introduce proper reading of LMD-Inca-dust fields– Run year-long experiments to check aerosol total mass conservation– GRIB and introduce the AEROCOM expB climate for SS, DU, POM,

BC, SU (the idea is to quickly have a model to be run and compared to results in AEROCOM web-site

What could/should be discussed at the Kick-Off Meeting

• Scientific approach– It might be possible to get quickly the full packages or at least some

routines from the aerosol representations by MPI-M and LMD-Inca (both modal representations vs. LMD-Z bin representation).

– PRO:• This might allow for a more informed choice of “final” GEMS-

Aerosols configuration to be made, more quickly.• This might allow for more extensive comparisons with existing

AEROCOM results (not discussed in GEMS-AER proposal)

– CON:• This might require extra Table 210 space for archiving results from

parallel-running parametrisations. • This might take “time and energy”.• This exercise will happen earlier than anything scheduled in

WP_AER4 and is very likely to be done at/by ECWMF only.

What could/should be discussed at the Kick-Off Meeting

• Strategy/Political problems– With the development of the first version of the global aerosol

model going a bit faster than scheduled in the proposal, is it really necessary to wait more than a year to get a report on diagnostics and skill scores (WP_AER4_4.1) and a database of aerosol-related radiative quantities (WP_AER4_4.2).

– With Olivier Boucher now at HC-MO, what is exactly happening of the work supposed to be carried out by CNRS-LOA? (WP_AER1, WP_AER3.2a, WP_AER3.3)

– What should we start with in terms of stratospheric aerosols? Are those derived from Tanre et al. (1984) climatology really meaningful? Is there anything better in terms of time series with a global coverage?

• In a first stage (~ko+6), the aerosols will not be interactive with the rest of the model: They will be passive tracers and will not have any impact on any of the other analysed field nor on the subsequent forecast.

• In later stages, the aerosols will first be made interactive with radiation (direct effect, ~ko+12), then tests will be carried out aerosols interactive with cloud processes (indirect effects, ~ko+18):– How likely is it to introduce some systematic differences

(errors?) in the first guess forecast? In the analyses?

Pandora’s box

ENDthank you for your

attention!

GEMS Kick-Off Meeting, Hamburg Aerosols: WP1

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Transcript of GEMS Kick-Off Meeting, Hamburg Aerosols: WP1