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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 18, issue 3
Ann. Geophys., 18, 337-346, 2000
https://doi.org/10.1007/s00585-000-0337-y
© European Geosciences Union 2000
Ann. Geophys., 18, 337-346, 2000
https://doi.org/10.1007/s00585-000-0337-y
© European Geosciences Union 2000

  31 Mar 2000

31 Mar 2000

IMPACT: an implicit time integration scheme for chemical species and families

G. D. Carver1 and P. A. Stott2 G. D. Carver and P. A. Stott
  • 1Centre for Atmospheric Science, Chemistry Department, Cambridge University, Lensfield Road, Cambridge, CB2 1EW, UK
  • 2Meteorology Department, Edinburgh University, Kings Buildings, May®eld Road, Edinburgh, EH9 3JZ, UK
  • Correspondence to: G. D. Carver
  • E-mail: glenn@atm.ch.cam.ac.uk

Abstract. The implicit time integration scheme of Stott and Harwood (1993) was proposed as an efficient scheme for use in three-dimensional chemical models of the atmosphere. The scheme was designed for chemistry schemes using `chemical families', in which species with short lifetimes are grouped into longer-lived families. Further study with more complex chemistry, more species and reactions showed the scheme to be non-convergent and unstable under certain conditions; particularly for the perturbed chemical scenarios of polar stratospheric winters. In this work the scheme has been improved by revising the treatment of families and the convergence properties of the scheme. The new scheme has been named IMPACT (IMPlicit Algorithm for Chemical Time-stepping). It remains easy to implement and produces simulations that compare well with integrations using more accurate higher order schemes.

Key words: Atmospheric composition and structure (middle atmosphere - composition and chemistry; lioposphere - composition and chemistry; instruments and techniques)

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