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| Titel |
Updating sea spray aerosol emissions in the Community Multiscale Air Quality (CMAQ) model version 5.0.2 |
| VerfasserIn |
B. Gantt, J. T. Kelly, J. O. Bash |
| 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 ; 8, no. 11 ; Nr. 8, no. 11 (2015-11-19), S.3733-3746 |
| Datensatznummer |
250116667
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| Publikation (Nr.) |
 copernicus.org/gmd-8-3733-2015.pdf |
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| Zusammenfassung |
| Sea spray aerosols (SSAs) impact the particle mass concentration and
gas-particle partitioning in coastal environments, with implications for
human and ecosystem health. Model evaluations of SSA emissions have mainly
focused on the global scale, but regional-scale evaluations are also
important due to the localized impact of SSAs on atmospheric chemistry near
the coast. In this study, SSA emissions in the Community Multiscale Air Quality (CMAQ) model were updated to enhance the fine-mode size
distribution, include sea surface temperature (SST) dependency, and reduce
surf-enhanced emissions. Predictions from the updated CMAQ model and those
of the previous release version, CMAQv5.0.2, were evaluated using several
coastal and national observational data sets in the continental US. The
updated emissions generally reduced model underestimates of sodium,
chloride, and nitrate surface concentrations for coastal sites in the Bay
Regional Atmospheric Chemistry Experiment (BRACE) near Tampa, Florida.
Including SST dependency to the SSA emission parameterization led to
increased sodium concentrations in the southeastern US and decreased
concentrations along parts of the Pacific coast and northeastern US. The
influence of sodium on the gas-particle partitioning of nitrate resulted in
higher nitrate particle concentrations in many coastal urban areas due to
increased condensation of nitric acid in the updated simulations,
potentially affecting the predicted nitrogen deposition in sensitive
ecosystems. Application of the updated SSA emissions to the California
Research at the Nexus of Air Quality and Climate Change (CalNex) study
period resulted in a modest improvement in the predicted surface concentration
of sodium and nitrate at several central and southern California coastal
sites. This update of SSA emissions enabled a more realistic simulation of
the atmospheric chemistry in coastal environments where marine air mixes
with urban pollution. |
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