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ACCENT-PhotoCom Aim: CTMs and CCMs calculation of atmospheric chemistry changes 2000 and 2030. In support IPCC AR4 report. Synergy air quality and climate gas emission reduction. Focus on human health and vegetation exposure

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Aim: CTMs and CCMs calculation of atmospheric chemistry changes 2000 and 2030.

In support IPCC AR4 report. Synergy air quality and climate gas emission reduction.

Focus on human health and vegetation exposure

Simulations: 1. year 2000; 2. 2030 Current Legislation

3. 2030 Maximum Feasible Reduction 4. 2030 SRES A2

5. 2030 Current Legislation in a changed climate.

Emissions: Global annual anthropogenic emission/scenarios IIASA, JRC, SRES,

and RIVM on a 1°x1° grid. Fire emissions on monthly basis. NetCDF.

Recommendations for natural emissions.

Meteorology: ECMWF, NCEP, GEOS-DAO, several GCMs

Participation: 25 models; 15 model families.

Output : Model information (grid spacing, vertical information, surface pressure, surface area).

Hourly ozone. Daily (10:30) NO2, CH2O and O3 vertical columns.

Monthly deposition NOy, HNO3, NO3p, SO2, SO4, NH3, NH4, O3.

Monthly mean O3, CO, CH4, NO, NO2, OH. CH4+OH destruction.

3D O3 chemical production and destruction. O3 flux through chemical tropopause.


2.1 ACCENT-PhotoComp (II)

Analysis: Output requested as NetCDF; NCO; Matlab, IDL.

Data storage on SRB server, ca. 1 Tb. 5 analysis groups;

Estimated analysis time 4 persons half a year.

Main results:

Estimates of changes in surface and free tropospheric ozone,

air quality indices, model variability, some process understanding.

Remarks: Despite stringent specification of output;

still rather heterogeneous submissions. Several iterations were necessary.

Publications: Stevenson et al. [2005] ; 4 manuscripts submitted


Some IT Aspects:

  • Used SRB server
  • The SDSC Storage Resource Broker (SRB) is client-server middleware that provides
  • a uniform interface for connecting to heterogeneous data resources over a network
  • and accessing replicated data sets.
  • In practice we used UNIX based access; there was not a good way for common access
  • to all data from ‘other users’
  • Data were processed by ‘authors’; using own software.
  • e.g. IDL regridding tools from Martin Schultz (not entirely bug-free).
  • i.e. regridding:
  • oldgrid = Obj_New('MGS_RGrid', gridname='GEOS')
  • newgrid = Obj_New('MGS_RGrid', gridname='1x1a')

2. Eurodelta

Aim: European scale regional atmospheric dispersion models.

Chemical nonlinearities in response to emission changes (i.e. SR relationships).

Evaluation of the performance of different regional models against set of observations

Quantify their performance in terms of agreed quality criteria.

Policy relevant input to the RAINS model and the Clean Air for Europe.

Simulations: 26 simulations using 2 meteorological years 1999 and 2001.

Scenarios for 2020 considered current legislation.

Component reductions of anthropogenic emissions by 25 or 50 %

for Italy, Germany France and North-Mediterranean Sea.

Emissions: European emission/scenarios by EMEP-West (50kmx50km grid)

Regridding by participant to desired grid.

ASCII input files; Recommendation on hourly, daily and monthly patterns 11 sectors.

Meteorology: MM5, ECMWF, HIRLAM

Participation: 6 models.

Output : One year, hourly surface concentrations of O3, NO2,HNO3, H2O2,NO,HCHO;

Daily surface concentrations of PPM2.5, PPM10, PM2.5,PM10, NH4, SO4, NO3,OC,BC

daily and monthly depositions of Sox, NOx, NHx (separated for forests).


2. Eurodelta (II)

Central pre-processing of data; and redistributed to participants of a selected set.

Common visualization tool (IDL based)

Analysis during workshops- and further analysis in small working groups, work load ).

4 persons ca. half a year.

Main Results: Estimate of model variability and of sensitivity to emission reduction

in 2020 (CLE/MFR).

Remarks: More stringent harmonization of boundary conditions

and of natural emissions would be desirable;

better description/and knowledge of what is included in each model;

source code + documentation.

Publications: 3 manuscripts in preparation



Aim: Improvement of aerosol modeling capacity. Emphasis on climate;

quantitative process understanding of aerosol formation and removal processes.

Systematic use of current satellite measurement programmes

surface based network data.

Participation from CTMs and GCMs meteorological data for 1996-1997-2000-2001.

Simulations : 3 experiments: 1) AEROCOM-A models as they are, meteorology for

1996/1997/2000/2001; 2) AEROCOM-B using year 2000 prescribed sources

2000 meteorological fields or climatological mode 3) AEROCOM PRE

using pre-industrial prescribed sources (y 1750) meteo year 2000 and/or in

climatological modeEmissions : 1°x1° emission datasets from various groups: OC-BC (Tami Bond);

SO2 (IIASA) (annual average); SO2 volcanoes (GEIA/update);

Simplified SOA source function.Recommendations on height distributions;

no temporal distribution, except biomass burning.

Meteorology: ECMWF, GCMs (??)



Meteorology: ECMWF, GCMs (??)

Participation: 14 global GLOBAL CTMs and GCMs AND


Output: Components Dust, seasalt, BC, POM, SO4, Aerosol mass and number.

Daily and monthly output of wet and dry deposition (turbulent+sedimentation);

emission flux, size segregrated mass (e.g. <0.5 μm and 1.25 μm),

aerosol water, RH, cloud fraction, monthly statistics of meteorology, AOD.

Analysis: Centralized analysis team; NCO scripts, and IDL software;

continuous update of model results on public web address

Several updates of models during the intercomparison. Full time 4 person for 1.5 year.

Remarks: Large variations in models’ removal processes were established;

still relatively good agreement with various remote sensed products

(e.g. AERONET, MISR, MODIS) of the ‘average’ model.

Publications: [Kinne et al., 2005; Textor et al., 2005]


4. MICS-Asia

Aim: The MICS-Asia model intercomparison Phase II

understanding transport and deposition of sulfur, nitrogen compounds,

ozone and aerosols in East Asia

Simulations: Four specified months in 2001

representative different chemical/meteorological conditions.

Emissions: Provided on request (no details given)

Meteorology: ??

Participation: 15 groups (?)

Output: monthly averaged concentrationss of

SO2, NO, NO2, HNO3, PAN, NH3, O3

sulfate, nitrate, and ammonium (air,precipitation).

Dry and wet deposition and rain fluxes.

Daily average SO2, NO, NO2, HNO3, O3 sulfate, nitrate

+ some vertical profiles. ASCII format.





“Intercomparison Study of Numerical Models for Long-Range Atmospheric Transport of Mercury”

Aim: EMEPs MSC-E intercomparison study of atmospheric long-range transport models for heavy metals.

Evaluation of parameterizations of the main physical-chemical processes of mercury transformations in the gaseous and the liquid phase; main features of long-range transport of different mercury forms

Comparison of modelling results with measurements obtained from short-term campaigns and from the EMEP monitoring network Simulations: one

Emissions: Single emission data set provided by EMEP-E.


Participation: 7 models of atmospheric mercury transport and deposition of regional and global levels.

Output: Gaseous Elemental Mercury in air, Hg concentration in precipitation, precipitation amount, Hg wet, dry and total deposition (per grid and per country). Mostly as Excel spreadsheet

Analysis: One person, xx years.

Remarks: The main purpose was to demonstrate that the EMEP operational model did not differ significantly from the most advanced scientific model and can be used for the tasks of the CLTAP

Publications:[Ryaboshapko et al., 2005; Ryaboshapko et al., 2003]



09:00 Start meeting (building 28)

09:00-09:15 Welcome/Background Dentener 09:15-10:00 Thunis/Cuvelier City Delta/Euro Delta 10:00-10:45 Michael Schulz/Stefan Kinne Aerocom 10:45-11:00 Coffee 11:00-11:45 Charles Doutrioux (Ocean modelling)

11:45-12:30 Rudolf Husar American Aerosol intercomparisons 12:30-14:00 Lunch + discussion

14:00-14:30 Christiane Textor (GEMS) 14:30-15:15 Stefano Galmarini Radioactivity Alert system

15:15-15:30 Tea 15:30-17:00 Discussion+ summarizing recommendations

17:15 adjourn