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• W2743287058 abstract "The aerodynamic roughness length (z0) is an essential parameter in surface energy balance studies, but few literature values exist for debris-covered glaciers. We use microtopographic and aerodynamic methods to assess the spatial variability of z0 for Lirung Glacier, Nepal. We apply structure from motion to produce digital elevation models for three nested domains: five 1 m2 plots, a 21,300 m2 surface depression, and the lower 550,000 m2 of the debris-mantled tongue. Wind and temperature sensor towers were installed in the vicinity of the plots within the surface depression in October 2014. We calculate z0 according to a variety of transect-based microtopographic parameterizations for each plot, then develop a grid version of the algorithms by aggregating data from all transects. This grid approach is applied to the surface depression digital elevation model to characterize z0 spatial variability. The algorithms reproduce the same variability among transects and plots, but z0 estimates vary by an order of magnitude between algorithms. Across the study depression, results from different algorithms are strongly correlated. Using Monin-Obukov similarity theory, we derive z0 values from the meteorological data. Using different stability criteria, we derive median values of z0 between 0.03 m and 0.05 m, but with considerable uncertainty due to the glacier's complex topography. Considering estimates from these algorithms, results suggest that z0 varies across Lirung Glacier between ∼0.005 m (gravels) to ∼0.5 m (boulders). Future efforts should assess the importance of such variable z0 values in a distributed energy balance model." @default.
• W2743287058 created "2017-08-17" @default.
• W2743287058 creator A5005399486 @default.
• W2743287058 creator A5026573668 @default.
• W2743287058 creator A5071056346 @default.
• W2743287058 date "2017-08-23" @default.
• W2743287058 modified "2023-09-25" @default.
• W2743287058 title "Highly variable aerodynamic roughness length (<i>z</i> ₀ ) for a hummocky debris-covered glacier" @default.
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• W2743287058 doi "https://doi.org/10.1002/2017jd026510" @default.
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