The albedo of martian dunes: Insights into aeolian activity and dust devil formation

K. A. Bennett, L. Fenton, James Bell

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Wind is the primary geologic process currently active on the surface of Mars. Albedo variations at eight dune fields were tested based on the hypothesis that a dune's ripple migration rate is correlated to its albedo. On Mars, where the atmospheric pressure is low, dust is removed from the surface of a dune by saltating sand. Therefore, more active dunes should remove dust more efficiently than less active dunes. A dune's albedo was found to be low in the first half of the Mars year (Ls =0-180°) and high in the second half (Ls =180-360°) during the dusty season. Both dunes with fast- and slow-moving ripples exhibit low albedos, whereas dunes with ripples that migrate at intermediate speeds exhibit high albedos. A dune's minimum albedo does not have a simple correlation with its ripple migration rate. Instead, we propose that dust devils remove dust on slow-moving and immobile dunes, whereas saltating sand caused by strong winds removes dust on faster dunes. Albedo should not be used as a proxy for migration rate of ripples or dune activity, as it may be difficult to distinguish between fast- and slow-moving ripples on dunes that have the same albedo. The presence of dust devil tracks on a dune could indicate the dune and/or its ripples are either immobile or migrating slowly. We also propose that albedo variations on individual dune fields can reveal insight into the local wind regime.

Original languageEnglish (US)
JournalAeolian Research
DOIs
StateAccepted/In press - Mar 19 2016

Fingerprint

dust devil
eolian process
eolian deposit
albedo
dune
ripple
dust
Mars
dune field
sand

ASJC Scopus subject areas

  • Geology
  • Earth-Surface Processes

Cite this

The albedo of martian dunes : Insights into aeolian activity and dust devil formation. / Bennett, K. A.; Fenton, L.; Bell, James.

In: Aeolian Research, 19.03.2016.

Research output: Contribution to journalArticle

@article{8a91107ebabb4cd98ad44e43ee04869c,
title = "The albedo of martian dunes: Insights into aeolian activity and dust devil formation",
abstract = "Wind is the primary geologic process currently active on the surface of Mars. Albedo variations at eight dune fields were tested based on the hypothesis that a dune's ripple migration rate is correlated to its albedo. On Mars, where the atmospheric pressure is low, dust is removed from the surface of a dune by saltating sand. Therefore, more active dunes should remove dust more efficiently than less active dunes. A dune's albedo was found to be low in the first half of the Mars year (Ls =0-180°) and high in the second half (Ls =180-360°) during the dusty season. Both dunes with fast- and slow-moving ripples exhibit low albedos, whereas dunes with ripples that migrate at intermediate speeds exhibit high albedos. A dune's minimum albedo does not have a simple correlation with its ripple migration rate. Instead, we propose that dust devils remove dust on slow-moving and immobile dunes, whereas saltating sand caused by strong winds removes dust on faster dunes. Albedo should not be used as a proxy for migration rate of ripples or dune activity, as it may be difficult to distinguish between fast- and slow-moving ripples on dunes that have the same albedo. The presence of dust devil tracks on a dune could indicate the dune and/or its ripples are either immobile or migrating slowly. We also propose that albedo variations on individual dune fields can reveal insight into the local wind regime.",
author = "Bennett, {K. A.} and L. Fenton and James Bell",
year = "2016",
month = "3",
day = "19",
doi = "10.1016/j.aeolia.2016.08.009",
language = "English (US)",
journal = "Aeolian Research",
issn = "1875-9637",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - The albedo of martian dunes

T2 - Insights into aeolian activity and dust devil formation

AU - Bennett, K. A.

AU - Fenton, L.

AU - Bell, James

PY - 2016/3/19

Y1 - 2016/3/19

N2 - Wind is the primary geologic process currently active on the surface of Mars. Albedo variations at eight dune fields were tested based on the hypothesis that a dune's ripple migration rate is correlated to its albedo. On Mars, where the atmospheric pressure is low, dust is removed from the surface of a dune by saltating sand. Therefore, more active dunes should remove dust more efficiently than less active dunes. A dune's albedo was found to be low in the first half of the Mars year (Ls =0-180°) and high in the second half (Ls =180-360°) during the dusty season. Both dunes with fast- and slow-moving ripples exhibit low albedos, whereas dunes with ripples that migrate at intermediate speeds exhibit high albedos. A dune's minimum albedo does not have a simple correlation with its ripple migration rate. Instead, we propose that dust devils remove dust on slow-moving and immobile dunes, whereas saltating sand caused by strong winds removes dust on faster dunes. Albedo should not be used as a proxy for migration rate of ripples or dune activity, as it may be difficult to distinguish between fast- and slow-moving ripples on dunes that have the same albedo. The presence of dust devil tracks on a dune could indicate the dune and/or its ripples are either immobile or migrating slowly. We also propose that albedo variations on individual dune fields can reveal insight into the local wind regime.

AB - Wind is the primary geologic process currently active on the surface of Mars. Albedo variations at eight dune fields were tested based on the hypothesis that a dune's ripple migration rate is correlated to its albedo. On Mars, where the atmospheric pressure is low, dust is removed from the surface of a dune by saltating sand. Therefore, more active dunes should remove dust more efficiently than less active dunes. A dune's albedo was found to be low in the first half of the Mars year (Ls =0-180°) and high in the second half (Ls =180-360°) during the dusty season. Both dunes with fast- and slow-moving ripples exhibit low albedos, whereas dunes with ripples that migrate at intermediate speeds exhibit high albedos. A dune's minimum albedo does not have a simple correlation with its ripple migration rate. Instead, we propose that dust devils remove dust on slow-moving and immobile dunes, whereas saltating sand caused by strong winds removes dust on faster dunes. Albedo should not be used as a proxy for migration rate of ripples or dune activity, as it may be difficult to distinguish between fast- and slow-moving ripples on dunes that have the same albedo. The presence of dust devil tracks on a dune could indicate the dune and/or its ripples are either immobile or migrating slowly. We also propose that albedo variations on individual dune fields can reveal insight into the local wind regime.

UR - http://www.scopus.com/inward/record.url?scp=84995407543&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84995407543&partnerID=8YFLogxK

U2 - 10.1016/j.aeolia.2016.08.009

DO - 10.1016/j.aeolia.2016.08.009

M3 - Article

AN - SCOPUS:84995407543

JO - Aeolian Research

JF - Aeolian Research

SN - 1875-9637

ER -