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ÉCLAIRE model inter-comparison of atmospheric nitrogen deposition and concentrations over Europe. R.J. Wichink Kruit 1 , D. Simpson 2 , M. Schaap 1 , R. Kranenburg 1 , E. Dammers 1 ,

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slide1

ÉCLAIRE model inter-comparison of atmospheric nitrogen deposition and concentrations over Europe

R.J. Wichink Kruit1, D. Simpson2, M. Schaap1, R. Kranenburg1, E. Dammers1,

C.A. Geels3, C. Skjoth4, M. Engardt5, A. Graff6, R. Stern7 , B. Bessagnet8, L. Rouil8, J.M. Baldasano9, M. Pay9, D. Hauglustaine10, A. Nyiri2, M.A. Sutton11, S. Reis11,

P. Thunis12 and C. Cuvelier12

1 TNO, Dept. of Climate, Air and Sustainability, P.O. Box 80015, NL-3508TA Utrecht, The Netherlands

2 Norwegian Meteorological Institute, Air Pollution Section Research Department, P.O. Box 43, Blindern, N-0313, Oslo, Norway

3 Aarhus University, Department of Environmental Science-Atmospheric modeling, Frederiksborgvej 399, 4000 Roskilde, Denmark

4 University of Worcester, National Pollen and Aerobiology Research Unit, Henwick Grove, VR2 6AJ, Worcester, United Kingdom

5 SMHI, Norkoping

6 Umweltbundesamt, Postfach 1406, D-06813 Dessau-Roßlau, Germany

7 Freie Universität Berlin, Institut für Meteorologie und Troposphärische Umweltforschung, Carl-Heinrich-Becker Weg 6-10, D-12165 Berlin, Germany

8 INERIS, Institut National de l’Environnement Industriel et des Risques Parc Technologique, ALATA, F-60550 Verneuil-en-Halatte, France

9 Barcelona Supercomputing Center, c/ Jordi Girona 29, E-08034 Barcelona, Spain

10 Laboratoire des Sciences du Climat et de l’environnement, UMR 8212 CEA-CNRS-UVSQ, Gif-sur-Yvette, France

11 CEH, Natural Environmental Research Council, Bush Estate, Pinicuik, Midlothian, EH26 0QB

12 European Commission, DG Joint Research Centre, Institute for Environment and Sustainability, I-21020 Ispra (Va), Italy

motivation
Motivation

It is difficult to say anything about uncertainties in model calculations of Nr-deposition as there are no observations of total Nr deposition available yet.

This study aims to:

  • deliver an ensemble map of the total Nr-deposition over Europe based on 7 regional European CTMs, and to
  • estimate the inter-model variation in the total Nr-deposition over Europe
  • validate the models by comparing modelled wet depositions and concentrations with observations from the EMEP wet deposition network and NitroEurope IP
model settings
Modelling the European Nitrogen budgetModel settings

Models: EMEP, LOTOS-EUROS, DEHM, MATCH, CMAQ, CHIMERE, RCGC,

INCA (global)

Emissions:provided by INERIS at

0.5° x 0.25° Longitude/Latitude

Note: INCA used own emissions!

Resolution: 0.5° x 0.25° (~28x28 km2)

DEHM: hemispheric (~ 50x50 km2)

INCA (global): 3.75° x 1.875° (~210x210 km2)

Other Input:not prescribed.

Output domain:

individual model results
Modelling the European Nitrogen budgetIndividual model results

dry NHx

wet NHx

dry NOy

wet NOy

CMAQ

INCA

RCGC

DEHM

EMEP

CHIMERE

MATCH

LOTOS-EUROS

10 day running mean of model domain1
Modelling the European Nitrogen budget10-day running mean of model domain

Dry NHx ~ 45%

Dry NOy ~ 35%

Wet NHx ~ 55%

Wet Noy ~ 65%

conclusions from model inter comparison
Development of GHG projection guidelinesConclusions from model inter-comparison
  • This study showed that the total Nr-deposition (NHx +NOy) in the model domain were rather similar in all models
  • The variation in model results is largest for the dry deposition of NHx
  • Larger dry deposition is compensated by smaller wet deposition
  • The average variation in the modeled Nr-deposition was about
    • 30-50% over land and
    • 50-100% over water
  • NHx vs. NOy deposition is approximately 50% vs. 50%, but large regional differences!
  • Dry versus wet deposition contributions are approximately
    • 45% vs. 55% for NHx and
    • 35% vs. 65% for NOy and
    • 40% vs. 60% for total Nr (but large regional differences again!)
slide14
Modelling the European Nitrogen budget

LOTOS-EUROS

NH3

INCA

CMAQ

RCGC

CHIMERE

DEHM

MATCH

EMEP

ENSEMBLE

slide16
Modelling the European Nitrogen budget

Conclusions from comparison with observations

  • Ensemble results of the seven regional CTM models are generally better than the individual model results
  • Modelled wet deposition of NOy correlates much better with observed wet deposition than NHx.
  • Regional CTMs are well able to estimate ‘background’ NH3concentrations
  • Data from NitroEurope IP is very useful for the ECLAIRE model evaluation!
  • Further analysis of the model-measurement comparison and reasons for inter-model differences is a priority for the next phase in ECLAIRE.
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