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Communication Dans Un Congrès Année : 2021

Latest results from ChemCam Passive Sky Spectroscopy at Gale Crater, Mars

Résumé

The Mars Science Laboratory's (MSL) ChemCam spectrometer measures atmospheric aerosol properties as well as O2 and H2O gas abundances by operating in passive mode and observing scattered sky light at two different elevation angles [e.g. 1,2]. The most important ChemCam passive sky results reported to date include: evidence (via comparisons with MSL's REMS humidity sensor) for strong diurnal surface-atmosphere exchange of water vapor [3]; dust aerosol particle size patterns, in good agreement with other instruments, which include a seasonally repeating pattern of dust particle size ranging from typically 0.7 (in the clear season) to 1.7 (in the dusty season) microns effective radius along with very large dust particle sizes in a global dust storm [4, 5, 6]; O2 column-averaged volume mixing ratio results that are unexpectedly high with variability well beyond expectations for a non-condensable trace gas [2], but which are affected by not yet fully quantified measurement uncertainties. The ChemCam passive sky results now span about 3000 sols, and we will present new results and model comparisons based on that extended data set with improved methodology and with new comparisons to other instruments. Among the interesting new results in the extended data set is the return of water vapor and O2 seasonal patterns to more normal behavior after significant deviations from typical behavior in the vicinity of the 2018 global dust storm. One important comparison that we will report on is with new high spatial resolution water vapor retrievals from CRISM (on Mars Reconnaissance Orbiter) -- these comparisons have implications for the vertical profile of water vapor and for interpreting discrepancies among the various orbit-derived data sets. The other comparison that we will focus on is with newly reported solar-occulation-derived O2 measurements from ACS on Trace Gas Orbiter[7] along with previously reported in-situ O2 results from MSL's SAM-GCMS[8]. [1]McConnochie, et al. (2018), Icarus, 307. [2] McConnochie, et al. (2019) AGU Fall Meeting. [3]Savijarvi et al. (2019) Icarus 319. [4]Lemmon et al. (2019) GRL. [5]Lemmon et al. (2019) 9th Int. Conf. on Mars #6298. [6]Vicente-Retortillo et al. (2017), GRL, 44. [7] Fedorova et al. (2021) EGU Meeting EGU21-14406. [8] Trainer, et al. (2019), JGR, 124.
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Dates et versions

insu-04436564 , version 1 (03-02-2024)

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Timothy Mcconnochie, Alain Khayat, Michael Smith, Mark Lemmon, German Martinez, et al.. Latest results from ChemCam Passive Sky Spectroscopy at Gale Crater, Mars. AGU Fall Meeting 2021, Dec 2021, New Orleans, United States. pp.id. P35A-02. ⟨insu-04436564⟩
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