A Warm Layer in the Nightside Mesosphere of Mars

Hiromu Nakagawa, Sonal K. Jain, Nicholas M. Schneider, Franck Montmessin, Roger V. Yelle, Fayu Jiang, Loic Verdier, Takeshi Kuroda, Nao Yoshida, Hitoshi Fujiwara, Takeshi Imamura, Naoki Terada, Kaori Terada, Kanako Seki, Hannes Gröller, Justin I. Deighan

Research output: Contribution to journalArticle

Abstract

We report a new set of stellar occultation measurements for nightside temperature profiles made by the Mars Atmosphere and Volatile EvolutioN/Imaging Ultraviolet Spectrograph that provide evidence for a recurring layer of warm air between 70 and 90 km altitudes in the nightside mesosphere of Mars during Ls = 0–180° in Martian Year 33–34. The nightside profiles reveal a recurring peak of atmospheric temperature around 80 km over the equator to the middle latitudes in the northern hemisphere. The predictions of the Mars Climate Database have a warm layer with much smaller amplitudes. The observed peak amplitudes are larger than those predicted by the model by up to 90 K. Wavenumber-3 structures are seen in the warm layer that are potentially signatures of thermal tides or stationary planetary waves, with amplitudes two times larger than predicted.

Original languageEnglish (US)
Article numbere2019GL085646
JournalGeophysical Research Letters
Volume47
Issue number4
DOIs
StatePublished - Feb 28 2020

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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    Nakagawa, H., Jain, S. K., Schneider, N. M., Montmessin, F., Yelle, R. V., Jiang, F., Verdier, L., Kuroda, T., Yoshida, N., Fujiwara, H., Imamura, T., Terada, N., Terada, K., Seki, K., Gröller, H., & Deighan, J. I. (2020). A Warm Layer in the Nightside Mesosphere of Mars. Geophysical Research Letters, 47(4), [e2019GL085646]. https://doi.org/10.1029/2019GL085646