Evaluation of the performance of different atmospheric chemical transport models and inter-comparison of nitrogen and sulphur deposition estimates for the UK
Artikel i vetenskaplig tidskrift, 2015

An evaluation has been made of a number of contrasting atmospheric chemical transport models, of varying complexity, applied to estimate sulphur and nitrogen deposition in the UK. The models were evaluated by comparison with annually averaged measurements of gas, aerosol and precipitation concentrations from the national monitoring networks. The models were evaluated in relation to performance criteria. They were generally able to satisfy a criterion of 'fitness for purpose' that at least 50% of modelled concentrations should be within a factor of two of measured values. The second criterion, that the magnitude of the normalised mean bias should be less than 20%, was not always satisfied. Considering known uncertainties in measurement techniques, this criterion may be too strict. Overall, simpler models were able to give a good representation of measured gas concentrations whilst the use of dynamic meteorology, and complex photo-chemical reactions resulted complex models. The models were compared graphically by plotting maps and cross-country transects of wet and dry deposition as well as calculating budgets of total wet and dry deposition to the UK for sulphur, oxidised nitrogen and reduced nitrogen. The total deposition to the UK varied by 22-36% amongst the different models depending on the deposition component. At a local scale estimates of both dry and wet deposition for individual 5 km x 5 km model grid squares were found to vary between the different models by up to a factor of 4.

Acid deposition




Atmospheric chemical



A. J. Dore

Centre for Ecology & Hydrology

D.C. Carslaw

King's College London

C. F. Braban

Centre for Ecology & Hydrology

M. Cain

University of Cambridge

Food and Rural Affairs

C. Chemel

University of Hertfordshire

C. Conolly

R. Derwent


S.J. Griffiths

E.ON Technologies

J. Hall

Centre for Ecology & Hydrology

G. D. Hayman

Centre for Ecology & Hydrology

S. Lawrence

Food and Rural Affairs

S.E. Metcalfe

University of Nottingham

A.L. Redington

Met Office

David Simpson

Chalmers, Rymd- och geovetenskap, Global miljömätteknik och modellering

M. A. Sutton

Centre for Ecology & Hydrology

P.A. Sutton

Y. S. Tang

Centre for Ecology & Hydrology

M. Vieno

Centre for Ecology & Hydrology

W.M. Davey

University of Wroclaw

J.D. Whyatt

Lancaster University

Atmospheric Environment

1352-2310 (ISSN)

Vol. 119 131-143


Meteorologi och atmosfärforskning