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Dryad

Fresh snow, peak accumulation, and ablation-Sun Cup snow surface datasets for evaluation of geometry aerodynamic roughness code

Data files

Feb 05, 2025 version files 22.28 MB

Abstract

These three datasets have been prepared to assess a computer code for the computation of the geometric-based aerodynamic roughness length z0. using the Lettau (1969; https://doi.org/10.1175/1520-0450(1969)008%3C0828:NOARPE%3E2.0.CO;2) formulation. They are at an extend of 1000 by 1000 pixels and in units of meters. They are in ASCIIGRID fomat ingestable by GIS software. 

The fresh snow surface is at a 0.001 m (1 mm) resolution and the data were collected on 2021-04-19 in Fort Collins, Colorado USA. The ablation-sun cup surface is at a 0.005 m (5 mm) resolution and the data were collected on 2017-06-13 in the headwaters of the Poudre River, near Milner Pass, Colorado USA. Both datasets were collected with a Faro Focus3D X 130 model Terrestrial lidar Scanner. The raw point cloud data were interpolated to the stated resolution using kriging with the SURFER software.

The peak accumulation dataset is at a 1 m resolution for the Niwot Saddle near Niwot Ridge, Colorado and were collected on 2010-05-20 using airborne lidar (see Harpold et al., 2014 https://doi.org/10.1002/2013WR013935 and Sexstone et al., 2022; https://doi.org/10.18172/cig.4951 for the raw data). The data were in gridded format, but linearly and then non-linearly detrended.