Transect snowpack ablation data for Niwot Ridge and Green Lakes Valley, 1992 - 1993.

Lowering of the snowpack surface by ablation (melt) was measured on a bimonthly basis within couloirs above the Green Lakes and Isabelle Valleys during the summer months. One-inch diameter PVC poles were driven into the snowpack to form vertical transects within each couloir. The height difference (cm) between the top of each pole and the snow surface was recorded. On the subsequent visit the new height difference was recorded and the pole driven into the snow and the reset height was recorded. Poles in a given transect were relocated as necessary during the course of the season.