Martian Atmospheric Thermal Structure and Dust Distribution During the MY 34 Global Dust Storm From ACS TIRVIM Nadir Observations

Vlasov, Pavel; Ignatiev, Nikolay; Korablev, Oleg; Grassi, D.; Korablev, Oleg; Grigoriev, A.; Millour, Ehouarn; Patsaev, D.; Montmessin, Franck; Zasova, L.; Guerlet, Sandrine; Trokhimovskiy, A.; Millour, E.; Forget, F.; Haus, Rainer; Arnold, G.; Montmessin, Franck

doi:10.1029/2022je007272

Cited by 6 publications

(3 citation statements)

References 44 publications

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“…Interestingly, several authors report that in the afternoon, the lower atmosphere (at 50 Pa) is warmer at mid‐southern latitudes than at mid‐northern ones during the GDE (Kass et al., 2020; Vlasov et al., 2022), linked with enhanced radiative forcing of the dust in the southern hemisphere (both due to the insolation at the current season, and the fact that there is more dust in the southern hemisphere during the peak of the storm). However, we see that on a diurnal mean basis, northern tropics are warmer than the southern ones at 50 Pa.…”

Section: Thermal Structure and Tides During The Global Dust Eventmentioning

confidence: 99%

“…On the other hand, Vlasov et al. (2022) studied the global thermal structure of the Martian atmosphere during the MY34 GDE from TIRVIM observations, but not specifically the tide characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, Kleinböhl et al (2020) reported a strong increase in diurnal tide amplitude, reaching 29 K at 60°S, but the authors could not study other tide modes. On the other hand, Vlasov et al (2022) studied the global thermal structure of the Martian atmosphere during the MY34 GDE from TIRVIM observations, but not specifically the tide characteristics.…”

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confidence: 99%

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Thermal Tides on Mars Before and During the 2018 Global Dust Event as Observed by TIRVIM‐ACS Onboard ExoMars Trace Gas Orbiter

Guerlet,

Fan,

Forget

et al. 2023

JGR Planets

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Migrating tides dominate the tropical climate on Mars and are known to reach high amplitudes during global dust events (GDE). In this study, we characterize the amplitude, phase and vertical wavelength of the diurnal and semi‐diurnal migrating tides in Mars’ lower atmosphere (up to 50km) by exploiting temperature vertical profiles retrieved from TIRVIM, an infrared spectrometer onboard the ExoMars Trace Gas Orbiter covering multiple local times. Observations from the Mars Climate Sounder onboard the Mars Reconnaissance Orbiter are used to complement the local time coverage when needed, and to estimate a seasonal trend to subtract from TIRVIM observations. We focus on two time periods in Martian Year 34, near Ls=150° and near Ls=200° (during the 2018 GDE). The characteristics of the migrating tides at Ls=150° agree very well with tidal theory: a downward propagation, amplitudes of typically 2–5K, and a larger vertical wavelength for the semi‐diurnal compared to the diurnal mode. Comparisons with model predictions from the Mars Planetary Climate Model reveal an excellent agreement, except for a slightly different phase of the diurnal tide. During the GDE, the tide pattern changes spectacularly: the diurnal tide amplitude reaches 35K at 65°S and 17K at 50°N, being vertically trapped up to 10Pa. The semi‐diurnal tide is maximum near 20–30°S with an amplitude of 8–12K. The phase of this mode is tilted with latitude, which was not the case before the storm. This indicates a significant contribution of the asymmetric Hough modes due to hemispheric asymmetry in the dust distribution.

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Section: Thermal Structure and Tides During The Global Dust Eventmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%