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| Titel |
Technical Note: Adjoint formulation of the TOMCAT atmospheric transport scheme in the Eulerian backtracking framework (RETRO-TOM) |
| VerfasserIn |
P. E. Haines, J. G. Esler, G. D. Carver |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 11 ; Nr. 14, no. 11 (2014-06-04), S.5477-5493 |
| Datensatznummer |
250118769
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| Publikation (Nr.) |
 copernicus.org/acp-14-5477-2014.pdf |
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| Zusammenfassung |
| A new methodology for the formulation of an adjoint to the transport component
of the chemistry transport model TOMCAT is described and
implemented in a new model, RETRO-TOM. The Eulerian backtracking method
is used, allowing the
forward advection scheme (Prather's second-order moments) to be
efficiently exploited in the backward adjoint calculations.
Prather's scheme is shown to be time symmetric,
suggesting the possibility of high accuracy. To attain this accuracy,
however, it is necessary to make a careful treatment of the "density
inconsistency" problem inherent to offline transport models. The
results are verified using a series of test experiments. These
demonstrate the high accuracy of RETRO-TOM when compared with direct
forward sensitivity calculations, at least for problems in which flux limiters in the
advection scheme are not required. RETRO-TOM therefore combines the
flexibility and stability of a "finite difference of adjoint" formulation with the
accuracy of an "adjoint of finite difference" formulation. |
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