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Journal article
ANISORROPIA: the adjoint of the aerosol thermodynamic model ISORROPIA
Atmospheric chemistry and physics, v 12(1), pp 527-543
01 Jan 2012
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
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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Details
- Title
- ANISORROPIA: the adjoint of the aerosol thermodynamic model ISORROPIA
- Creators
- S. L. Capps - Georgia Institute of TechnologyD. K. Henze - University of Colorado BoulderA. Hakami - Carleton UniversityA. G. Russell - Georgia Institute of TechnologyA. Nenes - Georgia Institute of Technology
- Publication Details
- Atmospheric chemistry and physics, v 12(1), pp 527-543
- Publisher
- Copernicus Gesellschaft Mbh
- Number of pages
- 17
- Grant note
- RD-833866 / US EPA STAR; United States Environmental Protection Agency American Petroleum Institute National Sciences and Engineering Research Council of Canada; Natural Sciences and Engineering Research Council of Canada (NSERC) NSF; National Science Foundation (NSF) Georgia Tech Institute ConocoPhillips Company Eastman Chemical Summer Graduate Fellowship NASA; National Aeronautics & Space Administration (NASA)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Civil, Architectural, and Environmental Engineering
- Web of Science ID
- WOS:000300320200029
- Scopus ID
- 2-s2.0-84855661489
- Other Identifier
- 991019186780004721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Environmental Sciences
- Meteorology & Atmospheric Sciences