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Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
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Evaluation of Cancer Stem Cell Migration Using Compartmentalizing Microfluidic Devices and Live Cell Imaging
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Megaripple Migration on Mars.

S Silvestro1,2, M Chojnacki3,4, D A Vaz5

  • 1INAF Osservatorio Astronomico di Capodimonte Napoli Italy.

Journal of Geophysical Research. Planets
|November 2, 2020
PubMed
Summary
This summary is machine-generated.

Active Martian megaripples, including bright Transverse Aeolian Ridges (TARs), have been observed migrating. This indicates these features are not relics of past climates but are active today, driven by Martian winds.

Keywords:
AeolianDuneMarsMegaripplesMigrationRipples

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Area of Science:

  • Planetary Science
  • Aeolian Geomorphology
  • Mars Surface Processes

Background:

  • Aeolian megaripples, with spacings of 5-50m, are common Martian surface features.
  • Previously, megaripples, especially bright Transverse Aeolian Ridges (TARs), were considered relict features due to a lack of observed movement.
  • High-resolution orbital imagery has historically failed to detect megaripple migration.

Purpose of the Study:

  • To investigate the activity and migration of Martian megaripples, particularly bright-toned ones (TARs).
  • To determine if megaripples and small TARs are active geological features in the present Martian climate.
  • To analyze sand flux associated with active megaripples and compare it to dune activity.

Main Methods:

  • Targeted high-resolution orbital imaging of two equatorial Martian regions: Syrtis Major and Mawrth Vallis.
  • Analysis of megaripple spacing, ranging from 1 to 35m (average 5m).
  • Quantification of sand flux for observed migrating megaripples and comparison with surrounding dunes.

Main Results:

  • Evidence of migration was found for bright-toned megaripples in Syrtis Major and Mawrth Vallis.
  • Active megaripples exhibit sand fluxes two orders of magnitude lower than surrounding dunes.
  • Martian megaripples can migrate obliquely and longitudinally, differing from terrestrial counterparts.

Conclusions:

  • Megaripples and small Transverse Aeolian Ridges (TARs) are active features on present-day Mars.
  • Their activity suggests a past climate with a denser atmosphere is not required for their formation or migration.
  • Active megaripples, alongside high-sand flux dunes, serve as key indicators of strong surface winds on Mars.