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| Titel |
Development of the high-order decoupled direct method in three dimensions for particulate matter: enabling advanced sensitivity analysis in air quality models |
| VerfasserIn |
W. Zhang, S. L. Capps, Y. Hu, A. Nenes, S. L. Napelenok, A. G. Russell |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 5, no. 2 ; Nr. 5, no. 2 (2012-03-23), S.355-368 |
| Datensatznummer |
250002447
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| Publikation (Nr.) |
 copernicus.org/gmd-5-355-2012.pdf |
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| Zusammenfassung |
| The high-order decoupled direct method in three dimensions for particulate
matter (HDDM-3D/PM) has been implemented in the Community Multiscale Air
Quality (CMAQ) model to enable advanced sensitivity analysis. The major
effort of this work is to develop high-order DDM sensitivity analysis of
ISORROPIA, the inorganic aerosol module of CMAQ. A case-specific approach
has been applied, and the sensitivities of activity coefficients and water
content are explicitly computed. Stand-alone tests are performed for
ISORROPIA by comparing the sensitivities (first- and second-order) computed
by HDDM and the brute force (BF) approximations. Similar comparison has also
been carried out for CMAQ sensitivities simulated using a week-long winter
episode for a continental US domain. Second-order sensitivities of aerosol
species (e.g., sulfate, nitrate, and ammonium) with respect to domain-wide
SO2, NOx, and NH3 emissions show agreement with BF results,
yet exhibit less noise in locations where BF results are demonstrably
inaccurate. Second-order sensitivity analysis elucidates poorly understood
nonlinear responses of secondary inorganic aerosols to their precursors and
competing species. Adding second-order sensitivity terms to the Taylor
series projection of the nitrate concentrations with a 50% reduction in
domain-wide NOx or SO2 emissions rates improves the prediction
with statistical significance. |
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