GLACIER MONITORING IN DENALI NATIONAL PARK AND PRESERVE
Two index monitoring sites are maintained in Denali, on the Kahiltna and Muldrow glaciers, both sites are at or near the ELA and attempt to measure conditions on the south and north sides of the Alaska Range, respectively. Since monitoring began in 1991, the Kahiltna glacier index site has had a slightly positive mass balance and a variable velocity that ranges from 180 to 250 meters per year. Seasonal balances are on the order of +/- one meter of water equivalency per year. During the same time period, the Traleika glacier has shown a consistently negative mass balance within a slightly narrower range of seasonal balances. Interestingly, the surface altitude of the index site has been increasing steadily despite the period of negative mass balance. This thickening may play a role in the surge-cycle of the Muldrow glacier, to which the Traleika is a major tributary. Since 1991, the Traleika glacier has flowed at a rate between 20 and 70 meters per year. In addition to the methods used and data acquired through the index monitoring program, results will be presented from other components of the glacier monitoring program in Denali.