High-altitude gravity waves in the Martian thermosphere observed by MAVEN/NGIMS and modeled by a gravity wave scheme

Erdal Yiğit, Scott L. England, Guiping Liu, Alexander S. Medvedev, Paul R. Mahaffy, Takeshi Kuroda, Bruce M. Jakosky

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

First high-altitude observations of gravity wave (GW)-induced CO2density perturbations in the Martian thermosphere retrieved from NASA's Neutral Gas Ion Mass Spectrometer (NGIMS) instrument on board the Mars Atmosphere Volatile EvolutioN (MAVEN) satellite are presented and interpreted using the extended GW parameterization of Yiʇit et al. (2008) and the Mars Climate Database as an input. Observed relative density perturbations between 180 and 220 km of 20-40% demonstrate appreciable local time, latitude, and altitude variations. Modeling for the spatiotemporal conditions of the MAVEN observations suggests that GWs can directly propagate from the lower atmosphere to the thermosphere, produce appreciable dynamical effects, and likely contribute to the observed fluctuations. Modeled effects are somewhat smaller than the observed, but their highly variable nature is in qualitative agreement with observations. Possible reasons for discrepancies between modeling and measurements are discussed.

Original languageEnglish
Pages (from-to)8993-9000
Number of pages8
JournalGeophysical Research Letters
Volume42
Issue number21
DOIs
Publication statusPublished - 2015 Nov 16

Keywords

  • MAVEN
  • Mars
  • gravity wave parameterization
  • gravity waves
  • thermosphere
  • waves

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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