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Discussion papers
https://doi.org/10.5194/acp-2019-622
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-622
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 10 Sep 2019

Submitted as: research article | 10 Sep 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

The influence of typhoons on atmospheric composition deduced from IAGOS measurements over Taipei

Frank Roux1, Hannah Clark2, Kuo-Ying Wang3, Susanne Rohs4, Bastien Sauvage1, and Philippe Nédélec1 Frank Roux et al.
  • 1Laboratoire d'Aérologie, Université de Toulouse and Centre National de la Recherche Scientifique, Toulouse, FR-31400, France
  • 2IAGOS-AISBL, 98 Rue du Trône, Brussels, B-1050, Belgium
  • 3Department of Atmospheric Sciences, National Central University, Taoyuan City, Taiwan 320
  • 4Forschungszentrum Juelich GmbH, Institut fuer Energie- und Klimaforschung 8: Troposphaere, DE-52425 Julich, Germany

Abstract. The research infrastructure IAGOS (In-Service Aircraft for a Global Observing System) equips commercial aircraft with instruments to monitor the composition of the atmosphere during flights around the world. In this article, we use data from two China Airlines aircraft based in Taipei (Taiwan) which provided daily measurements of ozone, carbon monoxide and water vapor throughout the summer of 2016. We present time series from the surface to the upper troposphere, of ozone, carbon monoxide and relative humidity near Taipei, focusing on periods influenced by the passage of typhoons. We examine landing and take-off profiles in the vicinity of tropical cyclones using ERA-5 re-analyses to elucidate the origin of the anomalies in the vertical distribution of these chemical species. Results indicate a high ozone content in the upper to middle troposphere upstream of the storms. The high ozone mixing ratios are generally correlated with potential vorticity and anti-correlated with relative humidity, suggesting stratospheric origin. These results suggest that tropical cyclones participate in transporting air from the stratosphere to troposphere and that such transport could be a regular feature of typhoons. After the typhoons passed Taiwan, the tropospheric column is filled with substantially lower ozone mixing ratios due to the rapid uplift of marine boundary layer air. At the same time, the relative humidity increases, and carbon monoxide mixing ratios fall. Locally, therefore, the passage of typhoons has a positive effect on air quality at the surface, cleansing the atmosphere and reducing the mixing ratios of pollutants such as CO and O3.

Frank Roux et al.
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Short summary
Ozone, carbon monoxide and relative humidity were measured by two China Airlines aircraft equipped with IAGOS instruments during the summer of 2016. We examine landing and take-off profiles near Taipei (Taiwan), in the vicinity of three typhoons, in relation with ERA-5 meteorological re-analyses. Upstream of the storms, these data suggest that air is transported downwards from the stratosphere. Downstream, the troposphere is cleaner and moister due to the uplift of marine boundary layer air.
Ozone, carbon monoxide and relative humidity were measured by two China Airlines aircraft...
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