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| Titel |
The zonal structure of tropical O3 and CO as observed by the Tropospheric Emission Spectrometer in November 2004 – Part 2: Impact of surface emissions on O3 and its precursors |
| VerfasserIn |
K. W. Bowman, D. B. A. Jones, J. A. Logan, H. Worden, F. Boersma, R. Chang, S. Kulawik, G. Osterman, P. Hamer, J. Worden |
| 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. 11 ; Nr. 9, no. 11 (2009-06-03), S.3563-3582 |
| Datensatznummer |
250007352
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| Publikation (Nr.) |
 copernicus.org/acp-9-3563-2009.pdf |
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| Zusammenfassung |
| The impact of surface emissions on the zonal structure of tropical
tropospheric ozone and carbon monoxide is investigated for November 2004
using satellite observations, in-situ measurements, and chemical transport
models in conjunction with inverse-estimated surface emissions.Vertical ozone
profiles from the Tropospheric Emission Spectrometer (TES) and ozone sonde
measurements from the Southern Hemisphere Additional Ozonesondes (SHADOZ)
network show elevated concentrations of ozone over Indonesia and Australia
(60–70 ppb) in the lower troposphere against the backdrop of the well-known
zonal "wave-one" pattern with ozone concentrations of (70–80 ppb)
centered over the Atlantic . Observational evidence from TES CO vertical
profiles and Ozone Monitoring Instrument (OMI) NO2 columns point
to regional surface emissions as an important contributor to the elevated
ozone over Indonesia. This contribution is investigated with the GEOS-Chem
chemistry and transport model using surface emission estimates derived from
an optimal inverse model, which was constrained by TES and Measurements Of
Pollution In The Troposphere (MOPITT) CO profiles (Jones et al., 2009). These
a posteriori estimates, which were over a factor of 2 greater than
climatological emissions, reduced differences between GEOS-Chem and TES ozone
observations by 30–40% over Indonesia. The response of the free
tropospheric chemical state to the changes in these emissions is investigated
for ozone, CO, NOx, and PAN. Model simulations indicate that ozone
over Indonesian/Australian is sensitive to regional changes in surface
emissions of NOx but relatively insensitive to lightning
NOx. Over sub-equatorial Africa and South America, free tropospheric
NOx was reduced in response to increased surface emissions
potentially muting ozone production. |
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