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Challenges in the Search for Perchlorate and Other Hydrated Minerals with 2.1-μm Absorptions on Mars

Leask, E. K. and Ehlmann, B. L. and Dundar, M. M. and Murchie, S. L. and Seelos, F. P. (2018) Challenges in the Search for Perchlorate and Other Hydrated Minerals with 2.1-μm Absorptions on Mars. Geophysical Research Letters, 45 (22). pp. 12180-12189. ISSN 0094-8276. http://resolver.caltech.edu/CaltechAUTHORS:20181121-071639184

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Abstract

A previously unidentified artifact has been found in Compact Reconnaissance Imaging Spectrometer for Mars targeted I/F data. It exists in a small fraction (<0.05%) of pixels within 90% of images investigated and occurs in regions of high spectral/spatial variance. This artifact mimics real mineral absorptions in width and depth and occurs most often at 1.9 and 2.1 μm, thus interfering in the search for some mineral phases, including alunite, kieserite, serpentine, and perchlorate. A filtering step in the data processing pipeline, between radiance and I/F versions of the data, convolves narrow artifacts (“spikes”) with real atmospheric absorptions in these wavelength regions to create spurious absorption‐like features. The majority of previous orbital detections of alunite, kieserite, and serpentine we investigated can be confirmed using radiance and raw data, but few to none of the perchlorate detections reported in published literature remain robust over the 1.0‐ to 2.65‐μm wavelength range.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1029/2018gl080077DOIArticle
ORCID:
AuthorORCID
Leask, E. K.0000-0002-3220-4003
Ehlmann, B. L.0000-0002-2745-3240
Murchie, S. L.0000-0002-1616-8751
Additional Information:© 2018 The Authors. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made. Received 17 AUG 2018; Accepted 5 NOV 2018; Accepted article online 9 NOV 2018; Published online 26 NOV 2018. Thanks to K. Seelos and M. Parente for the suggestions of tests during presentations of early versions of this work to the CRISM team. Thanks to J. Bandfield, an anonymous reviewer, and editor A. Dombard for comments that improved the manuscript. Funding for this work was provided in part by an NSERC PGS‐D scholarship (E.K.L.), a NASA Habitable Worlds grant 80NSSC17K0444 and CRISM Extended Mission funding (B.L.E., E.K.L.), and support to B.L.E.'s group from the Rose Hills Foundation. A part of this research was sponsored by the National Science Foundation (NSF) under grant IIS‐1252648 (CAREER) to M.M.D. The content is solely the responsibility of the authors and does not necessarily represent the official views of NSF. All CRISM data used in this paper are publicly available through the PDS node (http://ode.rsl.wustl.edu/mars/).
Funders:
Funding AgencyGrant Number
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
NASA80NSSC17K0444
Rose Hills FoundationUNSPECIFIED
NSFIIS-1252648
Record Number:CaltechAUTHORS:20181121-071639184
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20181121-071639184
Official Citation:Leask, E. K., Ehlmann, B. L., Dundar, M. M., Murchie, S. L., & Seelos, F. P. (2018). Challenges in the search for perchlorate and other hydrated minerals with 2.1‐μm absorptions on Mars. Geophysical Research Letters, 45, 12,180–12,189. https://doi.org/10.1029/2018GL080077
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91121
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:21 Nov 2018 15:47
Last Modified:20 Dec 2018 18:34

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