Evolution of Mars’ Northern Polar Seasonal CO2 deposits: variations in surface brightness and bulk density
Small scale variations of seasonal ice are explored at different geomorphic units on the Northern Polar Seasonal Cap (NPSC). We use seasonal rock shadow measurements, combined with visible and thermal observations, to calculate density over time. The coupling of volume density and albedo allows us to determine the microphysical state of the seasonal CO2 ice. We find two distinct endmembers across the NPSC: 1) Snow deposits may anneal to form an overlying slab layer that fractures. These low density deposits maintain relatively constant densities over springtime. 2) Porous slab deposits likely anneal rapidly in early spring and fracture in late spring. These high density deposits dramatically increase in density over time. The endmembers appear to be correlated with latitude.
Citation Information
Publication Year | 2015 |
---|---|
Title | Evolution of Mars’ Northern Polar Seasonal CO2 deposits: variations in surface brightness and bulk density |
DOI | 10.1002/2014JE004706 |
Authors | Christopher P. Mount, Timothy N. Titus |
Publication Type | Article |
Publication Subtype | Journal Article |
Series Title | Journal of Geophysical Research E: Planets |
Index ID | 70148526 |
Record Source | USGS Publications Warehouse |
USGS Organization | Astrogeology Science Center |