Gómez Martín, JC, Vömel, H, Hay, TD et al. (5 more authors) (2016) On the variability of ozone in the equatorial eastern Pacific boundary layer. Journal of Geophysical Research: Atmospheres, 121 (18). pp. 11086-11103. ISSN 2169-897X
Abstract
Observations of surface ozone (O3) mixing ratios carried out during two ground-based field campaigns in the Galápagos Islands are reported. The first campaign, Primera Investigación sobre la Química, Evolución y Reparto de Ozono, was carried out from September 2000 to July 2002. The second study, Climate and HAlogen Reactivity tropicaL EXperiment, was conducted from September 2010 to March 2012. These measurements complement the Southern Hemisphere ADditional OZonesonde observations made with weekly to monthly frequency at Galápagos. In this work, the daily, intraseasonal, seasonal and interannual variability of O3 in the marine boundary layer are described and compared to those observed in other tropical locations. The O3 diurnal cycle shows two regimes: (i) photochemical destruction followed by nighttime recovery in the cold season (July to November) and (ii) daytime advection and photochemical loss followed by nighttime depositional loss associated to windless conditions in the warm season (February to April). Wavelet spectral analysis of the intraseasonal variability of O3 reveals components with periods characteristic of tropical instability waves. The O3 seasonal variation in Galápagos is typical of the Southern Hemisphere, with a maximum in August and a minimum in February–March. Comparison with other measurements in remote tropical ocean locations shows that the change of the surface O3 seasonal cycle across the equator is explained by the position of the Intertropical Convergence Zone and the O3 levels upwind.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016, American Geophysical Union. This is an author produced version of a paper published in Journal of Geophysical Research: Atmospheres. Uploaded with permission from the publisher. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemistry (Leeds) > Physical Chemistry (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 27 Oct 2016 11:33 |
Last Modified: | 14 Apr 2017 05:17 |
Published Version: | http://doi.org/10.1002/2016JD025392 |
Status: | Published |
Publisher: | American Geophysical Union |
Identification Number: | 10.1002/2016JD025392 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:106620 |