  The March 29 snow profile at the Spring Creek Pass CODOS site.&amp;nbsp; Dust layer D3-WY2014 is clearly visible in a thin band 1-2” below the snow surface, within a melt-freeze (polycrystal) crust.&amp;nbsp; Dust layer D4 (March 30) fell onto the clean snow surface seen in this profile, significantly reducing snow albedo until fresh snowfall beginning today (April 2) and began to bury D4.&amp;nbsp; Once re-exposed, radiative forcing in layer D4 will need to melt very little underlying SWE before merging with layer D3, reducing snow albedo even further.&amp;nbsp;  