Regularization of Mars Reconnaissance Orbiter CRISM along‐track oversampled hyperspectral imaging observations of Mars

Kreisch, Christina D.; O'Sullivan, Joseph A.; Arvidson, R. E.; Politte, David G.; He, Long; Stein, N.; Finkel, Justin; Guinness, E. A.; Wolff, Michael; Lapôtre, M. G. A.

doi:10.1016/j.icarus.2016.09.033

Cited by 29 publications

(44 citation statements)

References 37 publications

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“…We find that λ ≈ 1 balances the goodness of fit and the variances of X . Similar kinds of regularization methods have been used in the hyperspectral imaging of Mars [e.g., Kreisch et al , ; Quemerais et al , ].…”

Section: Inversion Methods and Resultsmentioning

confidence: 82%

The distribution of ammonia on Jupiter from a preliminary inversion of Juno microwave radiometer data

Ingersoll

Janssen

et al. 2017

Geophysical Research Letters

130

228

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The Juno microwave radiometer measured the thermal emission from Jupiter's atmosphere from the cloud tops at about 1 bar to as deep as a hundred bars of pressure during its first flyby over Jupiter (PJ1). The nadir brightness temperatures show that the Equatorial Zone is likely to be an ideal adiabat, which allows a determination of the deep ammonia abundance in the range 362−33+33 ppm. The combination of Markov chain Monte Carlo method and Tikhonov regularization is studied to invert Jupiter's global ammonia distribution assuming a prescribed temperature profile. The result shows (1) that ammonia is depleted globally down to 50–60 bars except within a few degrees of the equator, (2) the North Equatorial Belt is more depleted in ammonia than elsewhere, and (3) the ammonia concentration shows a slight inversion starting from about 7 bars to 2 bars. These results are robust regardless of the choice of water abundance.

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Section: Inversion Methods and Resultsmentioning

confidence: 82%

The distribution of ammonia on Jupiter from a preliminary inversion of Juno microwave radiometer data

Ingersoll

Janssen

et al. 2017

Geophysical Research Letters

130

228

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“…Nominal spatial resolution of map-projected full-resolution targeted (FRT) observations is 18 m/pixel. Since 2011, CRISM has also operated in along-track oversampled (ATO) mode, acquiring overlapping pixels in the along-track Journal of Geophysical Research: Planets 10.1002/2016JE005196 direction to achieve improved spatial resolution [Fraeman et al, 2013;Arvidson et al, 2014;Kreisch et al, 2016]. Mapping to smaller pixel sizes using ATOs (~12 m/pixel) is possible in regions with dense oversampling.…”

Section: Data Set Descriptionsmentioning

confidence: 99%

The structural, stratigraphic, and paleoenvironmental record exposed on the rim and walls of Iazu Crater, Mars

et al. 2017

Self Cite

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Iazu is a 6.8 km diameter crater located ~25 km south of Endeavour Crater in Meridiani Planum, Mars. The asymmetrical ejecta deposit and crater shape demonstrate that Iazu was formed by the impact of a projectile moving from west to east at 20 to 30° above the horizontal. The crater rim and walls expose an ~115 m thick section of intact banded bright and dark Burns formation polyhydrated sulfate deposits that overlie a lower section of basaltic crust of unknown thickness that has been slightly altered to Fe3+─Mg2+ smectites. The lower section also exhibits several basaltic outcrops that are overlain by banded bright and dark layers similar in appearance to the bright and dark bands evident in the overlying Burns formation. We interpret the lower section as indicative of a transition from regional‐scale fluvial activity to accumulation of sulfate‐rich deposits, culminating in a thick overlying section of Burns formation strata. Banding in the Burns formation and underlying strata is inferred to be a consequence of periodic variations in sulfate‐forming depositional environments.

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“…In that, CRISM resolution ( e.g., Murchie et al, 2009 ) brings some support to habitat detection. While the instrument might not be able to resolve microbial habitats individually, the ∼6 m/pixel along-track oversampled hyperspectral imaging resolution ( e.g., Kreisch et al, 2017 ) provides an important strategic tool for the identification of mineralogical transitions associated with potential habitats and ecotones. For example, ∼60 m spatial resolution is already capable of revealing temperature changes in hydrothermal springs reflected in changing mineralogies, and/or pigments of microbial colonies in these environments ( e.g., Kruse et al, 2011 ).…”

Section: Discussionmentioning

confidence: 99%

The Coevolution of Life and Environment on Mars: An Ecosystem Perspective on the Robotic Exploration of Biosignatures

Cabrol

2018

Astrobiology

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Earth's biological and environmental evolution are intertwined and inseparable. This coevolution has become a fundamental concept in astrobiology and is key to the search for life beyond our planet. In the case of Mars, whether a coevolution took place is unknown, but analyzing the factors at play shows the uniqueness of each planetary experiment regardless of similarities. Early Earth and early Mars shared traits. However, biological processes on Mars, if any, would have had to proceed within the distinctive context of an irreversible atmospheric collapse, greater climate variability, and specific planetary characteristics. In that, Mars is an important test bed for comparing the effects of a unique set of spatiotemporal changes on an Earth-like, yet different, planet. Many questions remain unanswered about Mars' early environment. Nevertheless, existing data sets provide a foundation for an intellectual framework where notional coevolution models can be explored. In this framework, the focus is shifted from planetary-scale habitability to the prospect of habitats, microbial ecotones, pathways to biological dispersal, biomass repositories, and their meaning for exploration. Critically, as we search for biosignatures, this focus demonstrates the importance of starting to think of early Mars as a biosphere and vigorously integrating an ecosystem approach to landing site selection and exploration. Key Words: Astrobiology—Biosignatures—Coevolution of Earth and life—Mars. Astrobiology 18, 1–27.

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Regularization of Mars Reconnaissance Orbiter CRISM along‐track oversampled hyperspectral imaging observations of Mars

Cited by 29 publications

References 37 publications

The distribution of ammonia on Jupiter from a preliminary inversion of Juno microwave radiometer data

The distribution of ammonia on Jupiter from a preliminary inversion of Juno microwave radiometer data

The structural, stratigraphic, and paleoenvironmental record exposed on the rim and walls of Iazu Crater, Mars

The Coevolution of Life and Environment on Mars: An Ecosystem Perspective on the Robotic Exploration of Biosignatures

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