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| Titel |
ANISORROPIA: the adjoint of the aerosol thermodynamic model ISORROPIA |
| VerfasserIn |
S. L. Capps, D. K. Henze, A. Hakami, A. G. Russell, A. Nenes |
| 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 ; 12, no. 1 ; Nr. 12, no. 1 (2012-01-10), S.527-543 |
| Datensatznummer |
250010449
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| Publikation (Nr.) |
 copernicus.org/acp-12-527-2012.pdf |
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| Zusammenfassung |
| We present the development of ANISORROPIA, the discrete adjoint of the
ISORROPIA thermodynamic equilibrium model that treats the
Na+-SO42−-
HSO4−-NH4+
-NO3−-Cl−-H2O
aerosol system, and we demonstrate its sensitivity analysis capabilities.
ANISORROPIA calculates sensitivities of an inorganic species in aerosol or
gas phase with respect to the total concentrations of each species present
with less than a two-fold increase in computational time over the
concentration calculations. Due to the highly nonlinear and discontinuous
solution surface of ISORROPIA, evaluation of the adjoint required a new,
complex-variable version of the model, which determines first-order
sensitivities with machine precision and avoids cancellation errors arising
from finite difference calculations. The adjoint is verified over an
atmospherically relevant range of concentrations, temperature, and relative
humidity. We apply ANISORROPIA to recent field campaign results from Atlanta,
GA, USA, and Mexico City, Mexico, to characterize the inorganic aerosol
sensitivities of these distinct urban air masses. The variability in the
relationship between fine mode inorganic aerosol mass and precursor
concentrations shown has important implications for air quality and climate. |
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