Seasonal variation of the HDO/H2O ratio in the atmosphere of Mars at the middle of northern spring and beginning of northern summer

Aoki, Shohei; Nakagawa, Hiromu; Sagawa, Hideo; Giuranna, M.; Sindoni, G.; Aronica, A.; Kasaba, Yasumasa

doi:10.1016/j.icarus.2015.06.021

Cited by 51 publications

(21 citation statements)

References 41 publications

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“…Our globally averaged results from the two datasets are also in good overall agreement with the mean D/H mixing ratios derived by Aoki et al (2015) for Ls = 96 • . They are within the range of the D/H values inferred by Villanueva et al (2015) for Ls = 80…”

Section: Discussionsupporting

confidence: 83%

“…Many observations have been performed since 1988 (Bjoraker et al 1989;Krasnopolsky et al 1997;Encrenaz et al 2001), all consistent with the first detection. More recently, attempts to map D/H on Mars as a function of latitude and season have been performed by Novak et al (2011), Villanueva et al (2015), Krasnopolsky (2015), Aoki et al (2015) and Encrenaz et al (2016).…”

Section: Introductionmentioning

confidence: 99%

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New measurements of D/H on Mars using EXES aboard SOFIA

Encrenaz

DeWitt

Richter

et al. 2018

A&A

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Section: Discussionsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

New measurements of D/H on Mars using EXES aboard SOFIA

Encrenaz

DeWitt

Richter

et al. 2018

A&A

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“…The different escape rates of H and D in the upper atmosphere are the clue to the long-term fate of the atmosphere, and explain why it is so different from Earth in terms of humidity. The D/H ratio in the lower atmosphere is roughly 5.5 times higher than the value found on Earth, showing variations with seasons and latitudes (Aoki et al 2015;. This suggests that water on Mars has been lost through time, as the lighter isotope escaped more easily than the heavier one.…”

Section: Water Cyclementioning

confidence: 81%

NOMAD, an Integrated Suite of Three Spectrometers for the ExoMars Trace Gas Mission: Technical Description, Science Objectives and Expected Performance

Vandaele¹,

Moreno²,

Patel³

et al. 2018

Space Sci Rev

109

117

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The NOMAD ("Nadir and Occultation for MArs Discovery") spectrometer suite on board the ExoMars Trace Gas Orbiter (TGO) has been designed to investigate the comThis paper is dedicated to the memory of M. Allen, V. Formisano, and J. McConnell. position of Mars' atmosphere, with a particular focus on trace gases, clouds and dust. The detection sensitivity for trace gases is considerably improved compared to previous Mars missions, compliant with the science objectives of the TGO mission. This will allow for a major leap in our knowledge and understanding of the Martian atmospheric composition and the related physical and chemical processes. The instrument is a combination of three spectrometers, covering a spectral range from the UV to the mid-IR, and can perform solar occultation, nadir and limb observations. In this paper, we present the science objectives of the instrument and explain the technical principles of the three spectrometers. We also discuss the expected performance of the instrument in terms of spatial and temporal coverage and detection sensitivity.

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“…Mars hydrogen and water spectral lines are bright and have been observed using ground‐based, space‐based, and remote sensing instruments for decades (Bertaux & Montmessin, ; Clarke et al, , , ; Krasnopolsky, ; Mahaffy et al, ; Novak et al, ; Owen et al, ; Villanueva et al, ; Webster et al, ). Recent discoveries have found there to be a seasonal dependence to the H abundance in the Martian exosphere and lower atmosphere (Aoki et al, ; Chaffin et al, , ; Clarke et al, , ; Fedorova et al, ; Halekas, ; Maltagliati et al, , ; Montmessin et al, ; Villanueva et al, ). Until recently, there were limited observations of D Lyman α emissions from the upper atmosphere of Mars (Bertaux et al, ; Clarke et al, ; Krasnopolsky et al, ).…”

Section: Introductionmentioning

confidence: 99%

The Variability of Atmospheric Deuterium Brightness at Mars: Evidence for Seasonal Dependence

et al. 2017

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The enhanced ratio of deuterium to hydrogen on Mars has been widely interpreted as indicating the loss of a large column of water into space, and the hydrogen content of the upper atmosphere is now known to be highly variable. The variation in the properties of both deuterium and hydrogen in the upper atmosphere of Mars is indicative of the dynamical processes that produce these species and propagate them to altitudes where they can escape the planet. Understanding the seasonal variability of D is key to understanding the variability of the escape rate of water from Mars. Data from a 15 month observing campaign, made by the Mars Atmosphere and Volatile Evolution Imaging Ultraviolet Spectrograph high‐resolution echelle channel, are used to determine the brightness of deuterium as observed at the limb of Mars. The D emission is highly variable, with a peak in brightness just after southern summer solstice. The trends of D brightness are examined against extrinsic as well as intrinsic sources. It is found that the fluctuations in deuterium brightness in the upper atmosphere of Mars (up to 400 km), corrected for periodic solar variations, vary on timescales that are similar to those of water vapor fluctuations lower in the atmosphere (20–80 km). The observed variability in deuterium may be attributed to seasonal factors such as regional dust storm activity and subsequent circulation lower in the atmosphere.

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Seasonal variation of the HDO/H2O ratio in the atmosphere of Mars at the middle of northern spring and beginning of northern summer

Cited by 51 publications

References 41 publications

New measurements of D/H on Mars using EXES aboard SOFIA

New measurements of D/H on Mars using EXES aboard SOFIA

NOMAD, an Integrated Suite of Three Spectrometers for the ExoMars Trace Gas Mission: Technical Description, Science Objectives and Expected Performance

The Variability of Atmospheric Deuterium Brightness at Mars: Evidence for Seasonal Dependence

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