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How robust are in situ observations for validating satellite-derived albedo over the dark zone of the Greenland Ice Sheet?

Permanent link
https://hdl.handle.net/10037/12444
DOI
https://doi.org/10.1002/2017GL073661
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Date
2017-07-17
Type
Journal article
Tidsskriftartikkel
Peer reviewed

Author
Ryan, J.C.; Hubbard, Alun Lloyd; Irvine-Fynn, T.; Doyle, S.H.; Cook, J.M.; Stibal, Marek; Box, J.E.
Abstract
Calibration and validation of satellite‐derived ice sheet albedo data require high‐quality, in situ measurements commonly acquired by up and down facing pyranometers mounted on automated weather stations (AWS). However, direct comparison between ground and satellite‐derived albedo can only be justified when the measured surface is homogeneous at the length‐scale of both satellite pixel and in situ footprint. Here we use digital imagery acquired by an unmanned aerial vehicle to evaluate point‐to‐pixel albedo comparisons across the western, ablating margin of the Greenland Ice Sheet. Our results reveal that in situ measurements overestimate albedo by up to 0.10 at the end of the melt season because the ground footprints of AWS‐mounted pyranometers are insufficient to capture the spatial heterogeneity of the ice surface as it progressively ablates and darkens. Statistical analysis of 21 AWS across the entire Greenland Ice Sheet reveals that almost half suffer from this bias, including some AWS located within the wet snow zone.
Description
Published version. Source at http://doi.org/10.1002/2017GL073661. ©2017. American Geophysical Union. All Rights Reserved
Publisher
American Geophysical Union
Citation
Ryan J, Hubbard AL, Irvine-Fynn T, Doyle S, Cook J, Stibal M, Box J. How robust are in situ observations for validating satellite-derived albedo over the dark zone of the Greenland Ice Sheet?. Geophysical Research Letters. 2017;44(12):6218-6225
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