TM meeting, KNMI, 12 November 2003

EVERGREEN WP 4200: model intercomparison on transport and chemistry

Peter Bergamaschi (JRC IES)

Jan Fokke Meirink (KNMI)

Stefan Körner / Martin Heimann (MPI)

Jean Francois Muller (BIRA IASB)

TM meeting, KNMI, 12 November 2003

EVERGREEN WP4200 – overview

• 222Rn• SF6

• OH (full chemistry runs)• calibration of OH fields• single-tracer forwards runs for CH4 (CO, and CO2?)

TM meeting, KNMI, 12 November 2003

EVERGREEN WP4200 – atmospheric transport / chemistry models

TM3 (KNMI) TM3 (MPI) IMAGES

(BIRA-IASB) MOZART (UPMC)

TM5 (JRC)

horizontal resolution

3 x 2 5 x 3.8 5 x 5 6 x 4 (global) 1 x 1 (zoom over Europe)

vertical layers 25 hybrid (surface - 0.0 hPa)

19 hybrid (surface - 0.0 hPa)

25 sigma (surface - 50 hPa)

25 hybrid (surface - 0.0 hPa)

advection slopes scheme [Russel & Lerner, 1981]

slopes scheme [Russel and Lerner, 1981]

Semi-Lagrangian (2nd order) [Smolarkiewicz and Rasch, 1991]

slopes scheme [Russel and Lerner, 1981]

vertical diffusion PBL: [Holtslag and Boville, 1993] FT: [Louis et al., 1982]

Louis, 1979 PBL: [Muller and Brasseur, 1995]

PBL: [Holtslag and Boville, 1993] FT: [Louis et al., 1982]

convective cumulus clouds

Tiedke, 1989 Tiedke, 1989 [Muller and Brasseur, 1995] [Costen et al., 1988]

Tiedke, 1989

meteorology ECMWF ECMWF / NCEP ECMF (climatological) ECMWF

chemistry - offline - CBM4 based chem

- offline - chem (?)

- offline - IMAGES-chemistry

- offline - CBM4 based chem

NCEP

TM meeting, KNMI, 12 November 2003

EVERGREEN WP4200 – 222Rn protocol

• constant surface emissions of 1 atom cm-2 s-1 between -60o S and 60o N

• constant surface emissions of 0.5 atom cm-2 s-1 between 60o N and 70o N (except Greenland)

• no temporal variation

TM meeting, KNMI, 12 November 2003

222Rn surface June

TM meeting, KNMI, 12 November 2003

222Rn 750hPa June

TM meeting, KNMI, 12 November 2003

222Rn 500hPa June

TM meeting, KNMI, 12 November 2003

222Rn 250hPa June

TM meeting, KNMI, 12 November 2003

222Rn latitude vs. altitude June

TM meeting, KNMI, 12 November 2003

222Rn latitude vs. altitude December

TM meeting, KNMI, 12 November 2003

222Rn Freiburg

TM meeting, KNMI, 12 November 2003

222Rn Schauinsland

TM meeting, KNMI, 12 November 2003

222Rn Mauna Loa

TM meeting, KNMI, 12 November 2003

EVERGREEN WP4200 – SF6 protocol

• simulation 1994-2001

• emissions EDGAR V3.2 SF6 inventory for 1995 (atmospheric increase 1994-2001

approximately linear)

• initial field 1994 from MPI (TRANSCOM)

TM meeting, KNMI, 12 November 2003

SF6 surface June 2001

TM meeting, KNMI, 12 November 2003

SF6 latitude vs. altitude June 2001

TM meeting, KNMI, 12 November 2003

SF6 latitude vs. altitude December 2001

TM meeting, KNMI, 12 November 2003

SF6 stations

01/01/2001 observed TM3 TM3 IMAGES TM5(KNMI) (MPI) (BIRA IASB) (JRC)

BRW 4.85 4.80 4.77 4.92 4.82SPO 4.50 4.37 4.34 4.34 4.36

NH-SH 0.35 0.43 0.43 0.58 0.46

TM meeting, KNMI, 12 November 2003

Conclusions

222RN

• horizontal distribution similar for all 4 models

• synoptic variabiltity well reproduced by all TM models

• similar vertical mixing TM3(KNMI) and TM5

• TM3(MPI): stronger vertical mixing (exception: TM3(KNMI) / TM5 stronger regional convection in the tropics)

• significant influence at monitoring stations

SF6

• significant difference in interhemispheric mixing: TM-models similar, but IMAGES stronger gradient

• significant difference in troposphere – stratosphere exchange: TM3(KNMI) and TM5(JRC) strongest gradient stratosphere

TM meeting, KNMI, 12 November 2003

Outlook

• Finalisation 222Rn / SF6

• OH (full chemistry runs)• calibration of OH fields• single-tracer forwards runs for CH4, (CO and CO2 ?)