Preprints
https://doi.org/10.5194/acp-2021-79
https://doi.org/10.5194/acp-2021-79

  08 Feb 2021

08 Feb 2021

Review status: this preprint is currently under review for the journal ACP.

Measurement report: In situ observations of deep convection without lightning during the tropical cyclone Florence 2018

Clara Nussbaumer1, Ivan Tadic1, Dirk Dienhart1, Nijing Wang1, Achim Edtbauer1, Lisa Ernle1, Jonathan Williams1,2, Florian Obersteiner3, Isidoro Gutiérrez-Álvarez4, Hartwig Harder1, Jos Lelieveld1,2, and Horst Fischer1 Clara Nussbaumer et al.
  • 1Max Planck Institute for Chemistry, Department of Atmospheric Chemistry, Mainz, Germany
  • 2Energy, Environment and Water Research Center, The Cyprus Institute, Nicosia, Cyprus
  • 3Karlsruhe Institute of Technology, Karlsruhe, Germany
  • 4Department of Integrated Sciences, Center for Natural Resources, Health and Environment (RENSMA), University of Huelva, Spain

Abstract. Hurricane Florence was the sixth named storm in the Atlantic hurricane season 2018. It caused dozens of deaths and major economic damage. In this study, we present in situ observations of trace gases within tropical storm Florence on September 2, 2018 after it had developed a rotating nature, and of a tropical wave observed close to the African continent on August 29, 2018 as part of the research campaign CAFE Africa (Chemistry of the Atmosphere – Field Experiment in Africa) with the HALO (High Altitude Long Range) research aircraft. We show the impact of deep convection on atmospheric composition by measurements of the trace gases nitric oxide (NO), ozone (O3), carbon monoxide (CO), hydrogen peroxide (H2O2), dimethyl sulfide (DMS) and methyl iodide (CH3I), and by the help of color enhanced infrared satellite imagery taken by GOES-16. While both systems, the tropical wave and the tropical storm, are deeply convective, we only find evidence for lightning in the tropical wave using both in situ NO measurements and data from the World Wide Lightning Location Network (WWLLN).

Clara Nussbaumer et al.

Status: open (until 05 Apr 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Clara Nussbaumer et al.

Clara Nussbaumer et al.

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Short summary
Lightning over continental and coastal areas is frequent and accompanied by deep convection while lightning over marine areas and particularly in tropical cyclones is rare. This research presents in situ observations of the tropical storm Florence 2018 near Cape Verde. We show the absence of lightning in the tropical storm despite the occurrence of deep convective processes by atmospheric trace gas measurements of O3, NO, CO, H2O2, DMS and CH3I.
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