Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 26, issue 7
Articles | Volume 26, issue 7
https://doi.org/10.5194/acp-26-4841-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-4841-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 26, issue 7
Research article
 | 
13 Apr 2026
Research article |  | 13 Apr 2026

Tropospheric low ozone and its diurnal cycle over the Western Pacific warm pool from solar absorption FTIR observations

Xiaoyu Sun, Mathias Palm, Katrin Müller, Denghui Ji, Sharon Patris, and Justus Notholt

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Short summary
Near-surface ozone over the tropical Pacific is among the lowest on Earth. This study provides rare observations from this key region. Using sunlight measurements with an infrared spectrometer in Palau, we found that ozone rises in the morning and falls after noon. This daily rhythm and very low levels show how clean ocean air and weak thunderstorms shape atmospheric chemistry and affect Earth's climate.
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