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Journal article
Development of the high-order decoupled direct method in three dimensions for particulate matter: enabling advanced sensitivity analysis in air quality models
Geoscientific model development, v 5(2), pp 355-368
01 Jan 2012
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
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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Details
- Title
- Development of the high-order decoupled direct method in three dimensions for particulate matter: enabling advanced sensitivity analysis in air quality models
- Creators
- W. Zhang - Georgia Institute of TechnologyS. L. Capps - Georgia Institute of TechnologyY. Hu - Georgia Institute of TechnologyA. Nenes - Georgia Institute of TechnologyS. L. Napelenok - US Environment Protection Agency, Research Triangle Park, North Carolina, USAA. G. Russell - Georgia Institute of Technology
- Publication Details
- Geoscientific model development, v 5(2), pp 355-368
- Publisher
- Copernicus Gesellschaft Mbh
- Number of pages
- 14
- Grant note
- Conoco-Phillips Inc. RD83215910; RD83362601; RD83096001; RD82897602; RD83107601 / US EPA; United States Environmental Protection Agency
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Civil, Architectural, and Environmental Engineering
- Web of Science ID
- WOS:000304060600007
- Scopus ID
- 2-s2.0-84869036028
- Other Identifier
- 991019186627704721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Geosciences, Multidisciplinary