Prosiectau fesul blwyddyn
Crynodeb
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
Iaith wreiddiol | Saesneg |
---|---|
Tudalennau (o-i) | 6218-6225 |
Cyfnodolyn | Geophysical Research Letters |
Cyfrol | 44 |
Rhif cyhoeddi | 12 |
Dyddiad ar-lein cynnar | 09 Meh 2017 |
Dynodwyr Gwrthrych Digidol (DOIs) | |
Statws | Cyhoeddwyd - 28 Meh 2017 |
Ôl bys
Gweld gwybodaeth am bynciau ymchwil 'How robust are in-situ observations for validating satellite-derived albedo over the dark zone of the Greenland Ice Sheet?'. Gyda’i gilydd, maen nhw’n ffurfio ôl bys unigryw.Traethodau Ymchwil Myfyriwr
-
UAV investigation of surface and tidewater mass loss processes across the Greenland Ice Sheet
Ryan, J. (Awdur), Snooke, N. (Goruchwylydd) & Hubbard, A. (Goruchwylydd), 2018Traethawd ymchwil myfyriwr: Traethawd Ymchwil Doethurol › Doethur yn y Athroniaeth
Ffeil
Prosiectau
- 1 Wedi Gorffen
-
Black and Bloom; variation in the albedo of the Greenland Ice Sheet as a result of interactionns between microbes and particulates
Irvine-Fynn, T. (Prif Ymchwilydd)
Natural Environment Research Council
01 Gorff 2015 → 30 Medi 2021
Prosiect: Ymchwil a ariannwyd yn allanol