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| Titel |
Observations of ozone production in a dissipating tropical convective cell during TC4 |
| VerfasserIn |
G. A. Morris, A. M. Thompson, K. E. Pickering, S. Chen, E. J. Bucsela, P. A. Kucera |
| 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 ; 10, no. 22 ; Nr. 10, no. 22 (2010-11-26), S.11189-11208 |
| Datensatznummer |
250008916
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| Publikation (Nr.) |
 copernicus.org/acp-10-11189-2010.pdf |
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| Zusammenfassung |
| From 13 July–9 August 2007, 25 ozonesondes were launched from Las Tablas,
Panama as part of the Tropical Composition, Cloud, and Climate Coupling
(TC4) mission. On 5 August, a strong convective cell formed in the Gulf of
Panama. World Wide Lightning Location Network (WWLLN) data indicated 563
flashes (09:00–17:00 UTC) in the Gulf. NO2 data from the Ozone Monitoring
Instrument (OMI) show enhancements, suggesting lightning production of NOx.
At 15:05 UTC, an ozonesonde ascended into the southern edge of the now
dissipating convective cell as it moved west across the Azuero Peninsula.
The balloon oscillated from 2.5–5.1 km five times (15:12–17:00 UTC),
providing a unique examination of ozone (O3) photochemistry on the edge
of a convective cell. Ozone increased at a rate of ~1.6–4.6 ppbv/hr
between the first and last ascent, resulting cell wide in an increase of
~(2.1–2.5) × 106 moles of O3. This estimate
agrees to within a factor of two of our estimates of photochemical lightning
O3 production from the WWLLN flashes, from the radar-inferred lightning
flash data, and from the OMI NO2 data (~1.2, ~1.0, and ~1.7 × 106 moles, respectively), though all estimates have large
uncertainties. Examination of DC-8 in situ and lidar O3 data gathered around
the Gulf that day suggests 70–97% of the O3 change occurred in
2.5–5.1 km layer. A photochemical box model initialized with nearby TC4
aircraft trace gas data suggests these O3 production rates are possible
with our present understanding of photochemistry. |
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