Challenges in the Search for Perchlorate and Other Hydrated Minerals with 2.1-μm Absorptions on Mars
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.
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/).Attached Files
Published - Leask_et_al-2018-Geophysical_Research_Letters.pdf
Accepted Version - nihms-1040890.pdf
Supplemental Material - grl58268-sup-0001-2018gl080077_s01.docx
Supplemental Material - grl58268-sup-0002-2018gl080077_s01.pdf
Supplemental Material - grl58268-sup-0003-2018gl080077_s02.pdf
Supplemental Material - grl58268-sup-0004-2018gl080077_s03.pdf
Supplemental Material - grl58268-sup-0005-2018gl080077_s04.pdf
Supplemental Material - grl58268-sup-0006-2018gl080077_s05.pdf
Supplemental Material - grl58268-sup-0007-2018gl080077_s06.pdf
Supplemental Material - grl58268-sup-0008-2018gl080077_s07.pdf
Supplemental Material - grl58268-sup-0009-2018gl080077_s08.pdf
Supplemental Material - grl58268-sup-0010-2018gl080077_s09.pdf
Supplemental Material - grl58268-sup-0011-2018gl080077_s10.pdf
Supplemental Material - grl58268-sup-0012-2018gl080077_s11.pdf
Supplemental Material - grl58268-sup-0013-2018gl080077_s12.pdf
Supplemental Material - grl58268-sup-0014-2018gl080077_s13.pdf
Supplemental Material - grl58268-sup-0015-2018gl080077_s14.pdf
Supplemental Material - grl58268-sup-0016-2018gl080077_s15.pdf
Supplemental Material - grl58268-sup-0017-2018gl080077_s16.pdf
Supplemental Material - grl58268-sup-0018-2018gl080077_s17.pdf
Supplemental Material - grl58268-sup-0019-2018gl080077_s01.csv
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Additional details
- PMCID
- PMC6750048
- Eprint ID
- 91121
- Resolver ID
- CaltechAUTHORS:20181121-071639184
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- NASA
- 80NSSC17K0444
- Rose Hills Foundation
- NSF
- IIS-1252648
- Created
-
2018-11-21Created from EPrint's datestamp field
- Updated
-
2021-11-16Created from EPrint's last_modified field
- Caltech groups
- Astronomy Department, Division of Geological and Planetary Sciences