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Record Details

Record 11 of 1762
Mars - Experimental study of albedo changes caused by dust fallout
External Online Source: doi:10.1016/0019-1035(84)90079-4
Author and Affiliation:
Wells, E. N.(Cornell Univ., Ithaca, NY, United States)
Veverka, J.(Cornell Univ., Ithaca, NY, United States)
Thomas, P.(Cornell University, Ithaca, NY, United States)
Abstract: A laboratory apparatus was used to simulate the uniform fallout and deposition of particles 1 to 5 microns in diameter in an experimental study on how the spectral and photometric properties of representative Martian areas are affected by fallout of atmospheric dust (smaller than or equalling 60 microns) suspended during dust storms. In this study, measurements are made in the changes in reflectance at optical and near-infrared wavelengths (0.4 to 1.2 micron) caused by deposition of varying amounts of a Mars-analog dust on bright and dark substrates before and after deposition of 6 x 10 to the -5th to 1.5 x 10 to the -3rd g/sq cm of simulated fallout. It is believed that only small amounts of dust particles (approximately 3 x 10 to the -4th g/sq cm) are needed to make significant albedo changes in dark areas of Mars, and that this would rule out uniform dust deposition on the surface of the planet. Data also indicate that other high albedo features like bright crater-related wind streaks may not be areas of significant sediment deposits. Laboratory simulations have permitted estimates of how much the reflectance of an area on Mars would change given a certain amount of dust fallout (g/sq cm) or reflectance data. These simulations may also be useful in tracking the transport and deposition of the dust.
Publication Date: Jun 01, 1984
Document ID:
19840059227
(Acquired Nov 28, 1995)
Accession Number: 84A42014
Subject Category: LUNAR AND PLANETARY EXPLORATION
Document Type: Journal Article
Publication Information: Icarus; p. 331-338; (ISSN 0019-1035); 58
Publisher Information: United States
Contract/Grant/Task Num: NSG-7156; NSG-7546
Financial Sponsor: NASA; United States
Organization Source: Cornell Univ.; Ithaca, NY, United States
Description: 8p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ALBEDO; ATMOSPHERIC DIFFUSION; DUST; MARS SURFACE; BASALT; FALLOUT; NEAR INFRARED RADIATION; SPECTRAL REFLECTANCE; SUBSTRATES
Imprint And Other Notes: Icarus (ISSN 0019-1035), vol. 58, June 1984, p. 331-338.
Availability Source: Other Sources
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