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| Titel |
Investigation of ship-plume chemistry using a newly-developed photochemical/dynamic ship-plume model |
| VerfasserIn |
H. S. Kim, C. H. Song, R. S. Park, G. Huey, J. Y. Ryu |
| 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 ; 9, no. 19 ; Nr. 9, no. 19 (2009-10-09), S.7531-7550 |
| Datensatznummer |
250007677
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| Publikation (Nr.) |
 copernicus.org/acp-9-7531-2009.pdf |
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| Zusammenfassung |
| A photochemical/dynamic ship-plume model, which can consider the ship-plume
dynamics and ship-plume chemistry, simultaneously, was developed to gain a
better understanding of atmospheric impact of ship emissions. The model
performance was then evaluated by a comparison with the observation data
measured on a NOAA WP-3D flight during the Intercontinental Transport and
Chemical Transformation 2002 (ITCT 2K2) airborne field campaign. The
simulation conditions and parameters, such as meteorological conditions,
emission rates, and background gas and particulate species concentrations,
were obtained directly and/or inferred indirectly from the ITCT 2K2
observation data. The model-predicted concentrations showed good agreement
with the observed concentrations of five ambient species (NOx,
NOy, ozone, HNO3, and H2SO4) at the eight plume transects
by the WP-3D flight with strong correlations around the 1:1 line
(0.64≤R≤0.85). In addition, a set of tests were carried out to
approximate the magnitude of the reaction probability of HNO3 onto
sea-salt particles in the model-observation comparison framework. These
results suggest that the reaction probability of HNO3 onto sea-salt
particles may be in the order of 0.05–0.1. The equivalent NOx
lifetime throughout the "entire plume" was also estimated from
photochemical/dynamic ship-plume modeling. The NOx lifetimes
estimated throughout the entire ship plume ranged from 2.64 h to 3.76 h
under stable to neutral stability conditions. The short NOx lifetime
over the entire ship plume clearly shows that the ship-plume chemistry
shortens the NOx lifetime considerably. Therefore, the ship-plume
chemistry model should be used to model the changes in ship-plume chemical
compositions and better evaluate the atmospheric impact of ocean-going ship
emissions. |
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