Assimilation of Temperatures and Column Dust Opacities Measured by ExoMars TGO‐ACS‐TIRVIM During the MY34 Global Dust Storm

Young, Roland; Millour, Ehouarn; Guerlet, Sandrine; Forget, F.; Ignatiev, Nikolay; Grigoriev, Аlexey; Arnold, G.; Trokhimovskiy, Alexander; Montmessin, Franck; Korablev, Oleg

doi:10.1029/2022je007312

Cited by 4 publications

(7 citation statements)

References 50 publications

(142 reference statements)

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“…The assimilation behaves well and is generally stable, more so than earlier work using TGO observations (Young et al, 2022). This is for two reasons.…”

Section: Assimilation Of Hemispheric Observationsmentioning

confidence: 66%

“…We exclude dust observations from the assimilation, as EMIRS dust retrievals were not yet available when we ran the assimilation. Young et al (2022) found that assimilating the dust column produces a more accurate assimilation than TuTD during dusty periods, but our L s range is the least dusty part of the year, so we do not expect this to significantly impact our results.…”

Section: Model and Assimilationmentioning

confidence: 76%

“…Young et al. (2022) found that assimilating the dust column produces a more accurate assimilation than TuTD during dusty periods, but our L s range is the least dusty part of the year, so we do not expect this to significantly impact our results.…”

Section: Model and Assimilationmentioning

confidence: 77%

“…Our assimilation method is described in full detail by Navarro et al (2017) and Young et al (2022). We begin the assimilation with an ensemble whose members differ only in their visible column dust optical depth τ, which is linearly spaced in log τ between 0.05 and 1.5 and set constant everywhere.…”

Section: Model and Assimilationmentioning

confidence: 99%

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First Assimilation of Atmospheric Temperatures From the Emirates Mars InfraRed Spectrometer

Young

Millour

Forget

et al. 2022

Geophysical Research Letters

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We assimilate atmospheric temperatures from the Emirates Mars Infrared Spectrometer on board the Emirates Mars Mission (EMM) into the Mars Planetary Climate Model at the start of EMM's early science phase (Mars Year 36 Ls = 57.34–92.90°). Mars data assimilation benefits significantly from EMM's unique near‐hemispheric observations, frequent repeated observations of the same location, and full diurnal cycle coverage. Our analysis verifies well against in‐sample temperature observations, and is 1–3 K warmer than Mars Climate Sounder observations. We identify a warm front in concurrent Emirates eXploration Imager observations by correlating an elongated water ice cloud with temperatures and winds in the analysis; the analysis winds are consistent with its observed motion. We also calculate the full horizontal wind diurnal cycle; the zonal flow is weaker and the meridional circulation is stronger than simulating the same time period using the model alone.

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“…The assimilation behaves well and is generally stable, more so than earlier work using TGO observations (Young et al, 2022). This is for two reasons.…”

Section: Assimilation Of Hemispheric Observationsmentioning

confidence: 66%

Section: Model and Assimilationmentioning

confidence: 76%

Section: Model and Assimilationmentioning

confidence: 77%

Section: Model and Assimilationmentioning

confidence: 99%

See 2 more Smart Citations

First Assimilation of Atmospheric Temperatures From the Emirates Mars InfraRed Spectrometer

Young

Millour

Forget

et al. 2022

Geophysical Research Letters

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“…The quantitative impact of these forcings on the tides' phase structure remains to be further investigated in future studies. Note that data assimilation of TIRVIM temperature and dust retrievals in the Mars PCM does not produce an upward‐propagating phase at southern mid‐latitudes (see Figure 19 in Young et al., 2022): this might be because about half of TIRVIM vertical profiles were not included in the assimilation for p < 5 Pa (due to their lower information content). An assimilation including water ice cloud observations would also further improve the analysis.…”

Section: Thermal Structure and Tides During The Global Dust Eventmentioning

confidence: 99%

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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Russian Studies of Planetary Atmospheres in 2019–2022

Korablev

2023

Izv. Atmos. Ocean. Phys.

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Assimilation of Temperatures and Column Dust Opacities Measured by ExoMars TGO‐ACS‐TIRVIM During the MY34 Global Dust Storm

Cited by 4 publications

References 50 publications

First Assimilation of Atmospheric Temperatures From the Emirates Mars InfraRed Spectrometer

First Assimilation of Atmospheric Temperatures From the Emirates Mars InfraRed Spectrometer

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

Russian Studies of Planetary Atmospheres in 2019–2022

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