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Conference Papers Year : 2018

Impact of Streamer Associated with Blue Jets on Stratospheric Ozone: a Model Study

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Abstract

In the framework of the preparation of TARANIS space mission dedicated to the study of transient luminous events (TLEs), a detailed ion-neutral chemistry model has been developed to simulate the impact of blue jet streamers on stratospheric chemistry. It is based on the MIPLASMO model (Microphysical and Photochemical Lagrangian Model of Ozone) widely used over the last 20 years to interpret balloon and satellite measurements associated with stratospheric ozone. It considers the time evolution of 118 species including neutral and ions species, through a set of 1760 reactions. In addition, the neutral chemistry associated with ozone takes classical nitrogen, chlorine and bromine species into account.

After model validation, we focus on the streamer representation in the model. We consider two streamer parametrizations, (i) an electric field pulse with constant value as a function of time during the event, (ii) a time-varying realistic electric field, which is the result of an electrodynamic streamer model. Simulations are performed from 20 km to 50 km altitude. Results obtained are analyzed in two different ways: (i) during the first 100 s to identify the major fast mechanism associated with excited species, (ii) during 2 days to evaluate the impact on neutral chemistry (ozone and NOx species). The modelling results indicate that the time evolution of both excited and neutral species volume mixing ratio are very sensitive to the considered streamer parametrization (pulse or realistic streamer) and the differences for two-day simulations are significant. We particularly focus on ozone loss in the mid-, high-stratosphere and ozone production in the low stratosphere as a function of altitude. We find that the impact of streamer parametrization on ozone depends on the altitude.

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Dates and versions

insu-03565548 , version 1 (11-02-2022)

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C. Xu, Nathalie Huret, Sebastien Celestin. Impact of Streamer Associated with Blue Jets on Stratospheric Ozone: a Model Study. American Geophysical Union, 2018, San Francisco, United States. pp. 10. ⟨insu-03565548⟩
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