High Sierra snow ablation observations

Qualitative observations made during July 1951 from elevations of 9000 - 14,000 feet as well as instrumental measurements made on the crest of Mt. Whitney are discussed. Snow in an air-exposed pan melted about 1.7 inches in a 24 hour period and in situ about 1.0 inch per day, and never exceed 10% of the total ablation. Results of observations indicate that considerable water evaporates from melting snow, but that the vapor loss is predominantly from moist soil and water surfaces, rather than from the snow surface. In discussion Dr. J.E. Church submits a series of letters from qualified specialists on the subject of ABLATION of snow at high altitudes.