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| Titel |
The impact of resolution on the Ox-HOx-NOx chemistry of ship plumes |
| VerfasserIn |
C. L. Charlton-Perez, M. J. Evans, J. H. Marsham, J. G. Esler |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250022801
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| Zusammenfassung |
| Ship emissions constitute a significant fraction of total anthropogenic emissions of NOx.
However, their inclusion in global atmospheric chemistry transport model causes these
models to calculate unrealistically high concentrations of O3 and NOx in the marine
boundary layer. It has been suggested that the coarse resolution of such models coupled to the
non-linear nature of the model chemistry leads to this overestimate however this has not been
systematically investigate.
In order to investigate this hypothesis a high resolution chemical transport model of the
marine boundary layer based on winds from a LEM which can be systematically degraded to
lower and lower resolution.
Our simulations show that the OH concentration, NOx lifetime and ozone production
efficiency of the model change by 8%, 32% and 31% respectively between the highest and
lowest resolution simulations. Interpolating to the resolution of a typical global composition
transport model (CTM, 5∘× 5∘), suggests that a CTM overestimates OH, NOx lifetime and
ozone production efficiency due to ship NOx by approximately 15%, 55% and 59%
respectively. Thus, the failure of CTMs to simulate ship plumes efficiently is likely due to the
combined impact of coarse resolution and non-linear Ox-HOx-NOx chemistry. These results
are significant for the assessment and forecasting of the climate impact of ship NOx and
indicate that at current global model resolutions ship plume emissions in CTMs, need to be
suitably parameterized. |
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