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Explaining mass balance and retreat dichotomies at Taku and Lemon Creek Glaciers, Alaska

April 14, 2020

We reanalyzed mass balance records at Taku and Lemon Creek Glaciers to better understand the relative roles of hypsometry, local climate and dynamics as mass balance drivers. Over the 1946–2018 period, the cumulative mass balances diverged. Tidewater Taku Glacier advanced and gained mass at an average rate of +0.25±0.28 m w.e. a–1, contrasting with retreat and mass loss of –0.60±0.15 m w.e. a-1 at land-terminating Lemon Creek Glacier. The uniform influence of regional climate is demonstrated by strong correlations among annual mass balance and climate data. Regional warming trends forced similar statistically significant decreases in surface mass balance after 1989: –0.83 m w.e. a–1 at Taku Glacier and –0.81 m w.e. a–1 at Lemon Creek Glacier. Divergence in cumulative mass balance arises from differences in glacier hypsometry and local climate. Since 2013 negative mass balance and glacier-wide thinning prevailed at Taku Glacier. These changes initiated terminus retreat, which could increase dramatically if calving begins. The future mass balance trajectory of Taku Glacier hinges on dynamics, likely ending the historic dichotomy between these glaciers.

Citation Information

Publication Year 2020
Title Explaining mass balance and retreat dichotomies at Taku and Lemon Creek Glaciers, Alaska
DOI 10.1017/jog.2020.22
Authors Christopher J. McNeil, Shad O'Neel, Michael Loso, Mauri Pelto, Louis C. Sass, Emily Baker, Seth Campbell
Publication Type Article
Publication Subtype Journal Article
Series Title Journal of Glaciology
Index ID 70209598
Record Source USGS Publications Warehouse
USGS Organization Alaska Science Center Water