Neither dust nor black carbon causing apparent albedo decline in Greenland's dry snow zone: Implications for MODIS C5 surface reflectance
Remote sensing observations suggest Greenland ice sheet (GrIS) albedo has declined since 2001, even in the dry snow zone. We seek to explain the apparent dry snow albedo decline. We analyze samples representing 2012–2014 snowfall across NW Greenland for black carbon and dust light-absorbing impuriti...
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ftuninhampshire:oai:scholars.unh.edu:earthsci_facpub-1151 2023-05-15T16:26:43+02:00 Neither dust nor black carbon causing apparent albedo decline in Greenland's dry snow zone: Implications for MODIS C5 surface reflectance Polashenski, Chris Dibb, Jack E. Flanner, Mark G Chen, Justin Y Courville, Zoe R Lai, Alexandra M Schauer, James J Shafer, Martin M Bergin, Mike 2015-11-03T08:00:00Z application/pdf https://scholars.unh.edu/earthsci_facpub/152 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1151&context=earthsci_facpub unknown University of New Hampshire Scholars' Repository https://scholars.unh.edu/earthsci_facpub/152 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1151&context=earthsci_facpub Earth Sciences Scholarship Greenland MODIS degradation dust albedo black carbon Atmospheric Sciences text 2015 ftuninhampshire 2023-04-06T17:33:56Z Remote sensing observations suggest Greenland ice sheet (GrIS) albedo has declined since 2001, even in the dry snow zone. We seek to explain the apparent dry snow albedo decline. We analyze samples representing 2012–2014 snowfall across NW Greenland for black carbon and dust light-absorbing impurities (LAI) and model their impacts on snow albedo. Albedo reductions due to LAI are small, averaging 0.003, with episodic enhancements resulting in reductions of 0.01–0.02. No significant increase in black carbon or dust concentrations relative to recent decades is found. Enhanced deposition of LAI is not, therefore, causing significant dry snow albedo reduction or driving melt events. Analysis of Collection 5 Moderate Resolution Imaging Spectroradiometer (MODIS) surface reflectance data indicates that the decline and spectral shift in dry snow albedo contains important contributions from uncorrected Terra sensor degradation. Though discrepancies are mostly below the stated accuracy of MODIS products, they will require revisiting some prior conclusions with C6 data. Text Greenland Ice Sheet University of New Hampshire: Scholars Repository Greenland |
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Open Polar |
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University of New Hampshire: Scholars Repository |
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ftuninhampshire |
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topic |
Greenland MODIS degradation dust albedo black carbon Atmospheric Sciences |
spellingShingle |
Greenland MODIS degradation dust albedo black carbon Atmospheric Sciences Polashenski, Chris Dibb, Jack E. Flanner, Mark G Chen, Justin Y Courville, Zoe R Lai, Alexandra M Schauer, James J Shafer, Martin M Bergin, Mike Neither dust nor black carbon causing apparent albedo decline in Greenland's dry snow zone: Implications for MODIS C5 surface reflectance |
topic_facet |
Greenland MODIS degradation dust albedo black carbon Atmospheric Sciences |
description |
Remote sensing observations suggest Greenland ice sheet (GrIS) albedo has declined since 2001, even in the dry snow zone. We seek to explain the apparent dry snow albedo decline. We analyze samples representing 2012–2014 snowfall across NW Greenland for black carbon and dust light-absorbing impurities (LAI) and model their impacts on snow albedo. Albedo reductions due to LAI are small, averaging 0.003, with episodic enhancements resulting in reductions of 0.01–0.02. No significant increase in black carbon or dust concentrations relative to recent decades is found. Enhanced deposition of LAI is not, therefore, causing significant dry snow albedo reduction or driving melt events. Analysis of Collection 5 Moderate Resolution Imaging Spectroradiometer (MODIS) surface reflectance data indicates that the decline and spectral shift in dry snow albedo contains important contributions from uncorrected Terra sensor degradation. Though discrepancies are mostly below the stated accuracy of MODIS products, they will require revisiting some prior conclusions with C6 data. |
format |
Text |
author |
Polashenski, Chris Dibb, Jack E. Flanner, Mark G Chen, Justin Y Courville, Zoe R Lai, Alexandra M Schauer, James J Shafer, Martin M Bergin, Mike |
author_facet |
Polashenski, Chris Dibb, Jack E. Flanner, Mark G Chen, Justin Y Courville, Zoe R Lai, Alexandra M Schauer, James J Shafer, Martin M Bergin, Mike |
author_sort |
Polashenski, Chris |
title |
Neither dust nor black carbon causing apparent albedo decline in Greenland's dry snow zone: Implications for MODIS C5 surface reflectance |
title_short |
Neither dust nor black carbon causing apparent albedo decline in Greenland's dry snow zone: Implications for MODIS C5 surface reflectance |
title_full |
Neither dust nor black carbon causing apparent albedo decline in Greenland's dry snow zone: Implications for MODIS C5 surface reflectance |
title_fullStr |
Neither dust nor black carbon causing apparent albedo decline in Greenland's dry snow zone: Implications for MODIS C5 surface reflectance |
title_full_unstemmed |
Neither dust nor black carbon causing apparent albedo decline in Greenland's dry snow zone: Implications for MODIS C5 surface reflectance |
title_sort |
neither dust nor black carbon causing apparent albedo decline in greenland's dry snow zone: implications for modis c5 surface reflectance |
publisher |
University of New Hampshire Scholars' Repository |
publishDate |
2015 |
url |
https://scholars.unh.edu/earthsci_facpub/152 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1151&context=earthsci_facpub |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
Earth Sciences Scholarship |
op_relation |
https://scholars.unh.edu/earthsci_facpub/152 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1151&context=earthsci_facpub |
_version_ |
1766015680146046976 |