Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 5.668 IF 5.668
  • IF 5-year value: 6.201 IF 5-year
    6.201
  • CiteScore value: 6.13 CiteScore
    6.13
  • SNIP value: 1.633 SNIP 1.633
  • IPP value: 5.91 IPP 5.91
  • SJR value: 2.938 SJR 2.938
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 174 Scimago H
    index 174
  • h5-index value: 87 h5-index 87
Volume 16, issue 8
Atmos. Chem. Phys., 16, 4837–4847, 2016
https://doi.org/10.5194/acp-16-4837-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Chem. Phys., 16, 4837–4847, 2016
https://doi.org/10.5194/acp-16-4837-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 19 Apr 2016

Research article | 19 Apr 2016

Influence of tropical cyclones on tropospheric ozone: possible implications

Siddarth Shankar Das1, Madineni Venkat Ratnam2, Kizhathur Narasimhan Uma1, Kandula Venkata Subrahmanyam1, Imran Asatar Girach1, Amit Kumar Patra2, Sundaresan Aneesh1, Kuniyil Viswanathan Suneeth1, Karanam Kishore Kumar1, Amit Parashuram Kesarkar2, Sivarajan Sijikumar1, and Geetha Ramkumar1 Siddarth Shankar Das et al.
  • 1Space Physics Laboratory, Vikram Sarabhai Space Centre, Trivandrum-695022, India
  • 2National Atmospheric Research Laboratory, Gadanki-517112, India

Abstract. The present study examines the role of tropical cyclones in the enhancement of tropospheric ozone. The most significant and new observation reported is the increase in the upper-tropospheric (10–16 km) ozone by 20–50 ppbv, which has extended down to the middle (6–10 km) and lower troposphere ( <  6 km). The descent rate of enhanced ozone layer during the passage of tropical cyclone is 0.8–1 km day−1, which is three times that of a clear-sky day (non-convective). Enhancement of surface ozone concentration by  ∼ 10 ppbv in the daytime and 10–15 ppbv in the night-time is observed during a cyclone. Potential vorticity, vertical velocity and potential temperature obtained from numerical simulation, reproduces the key feature of the observations. A simulation study indicates the downward transport of stratospheric air into the troposphere. Space-borne observations of relative humidity indicate the presence of sporadic dry air in the upper and middle troposphere over the cyclonic region. These observations quantitatively constitute experimental evidence of redistribution of stratospheric ozone during cyclonic storms.

Publications Copernicus
Download
Short summary
The present study examines the role of tropical cyclones in the enhancement of tropospheric ozone. The most significant and new observation reported is the increase in the upper-tropospheric ozone by 20–50 ppbv, which has extended down to the middle and lower troposphere. The descent rate of enhanced ozone layer during the passage of tropical cyclone is 0.8–1 km day−1. Enhancement of surface ozone concentration by ~ 10 ppbv in the daytime and 10–15 ppbv at night-time is observed.
The present study examines the role of tropical cyclones in the enhancement of tropospheric...
Citation