Spectral signatures of submicron scale light-absorbing impurities in snow and ice using hyperspectral microscopy
Light-absorbing impurities (LAI) can darken snow and ice surfaces, reduce snow/ice albedo and accelerate melt. Efforts to allocate the relative contribution of different LAI to snow/ice albedo reductions have been limited by uncertainties in the optical properties of LAI. We developed a new method t...
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International Glaciological Society
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ftunivzuerich:oai:www.zora.uzh.ch:160709 2024-09-15T18:15:42+00:00 Spectral signatures of submicron scale light-absorbing impurities in snow and ice using hyperspectral microscopy Dal Farra, Anna Kaspari, Susan Beach, James Bucheli, Thomas D Schaepman, Michael E Schwikowski, Margit 2018-06-01 application/pdf https://www.zora.uzh.ch/id/eprint/160709/ https://www.zora.uzh.ch/id/eprint/160709/1/2018_spectral_signatures_of_submicron_scale_lightab.pdf https://doi.org/10.5167/uzh-160709 https://doi.org/10.1017/jog.2018.29 eng eng International Glaciological Society https://www.zora.uzh.ch/id/eprint/160709/1/2018_spectral_signatures_of_submicron_scale_lightab.pdf doi:10.5167/uzh-160709 doi:10.1017/jog.2018.29 urn:issn:0022-1430 info:eu-repo/semantics/openAccess Creative Commons: Attribution 4.0 International (CC BY 4.0) http://creativecommons.org/licenses/by/4.0/ Dal Farra, Anna; Kaspari, Susan; Beach, James; Bucheli, Thomas D; Schaepman, Michael E; Schwikowski, Margit (2018). Spectral signatures of submicron scale light-absorbing impurities in snow and ice using hyperspectral microscopy. Journal of Glaciology, 64(245):377-386. Institute of Geography 910 Geography & travel Journal Article PeerReviewed info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2018 ftunivzuerich https://doi.org/10.5167/uzh-16070910.1017/jog.2018.29 2024-09-04T00:39:05Z Light-absorbing impurities (LAI) can darken snow and ice surfaces, reduce snow/ice albedo and accelerate melt. Efforts to allocate the relative contribution of different LAI to snow/ice albedo reductions have been limited by uncertainties in the optical properties of LAI. We developed a new method to measure LAI spectral reflectance at the submicron scale by modifying a Hyperspectral Imaging Microscope Spectrometer (HIMS). We present the instrument's internal calibration, and the overall small influence of a particle's orientation on its measured reflectance spectrum. We validated this new method through the comparison with a field spectroradiometer by measuring different standard materials. Measurements with HIMS at the submicron scale and the bulk measurements of the same standard materials with the field spectroradiometer are in good agreement with an average deviation between the spectra of 3.2% for the 400–1000 nm wavelength range. The new method was used (1) to identify BC (black carbon), mineral dust including hematite and the humic substances present in an environmental sample from Plaine Morte glacier and (2) to collect the individual reflectance spectra of each of these types of impurity. The results indicate that this method is applicable to heterogeneous samples such as the LAI found in snow and ice. Article in Journal/Newspaper Journal of Glaciology University of Zurich (UZH): ZORA (Zurich Open Repository and Archive |
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Open Polar |
collection |
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive |
op_collection_id |
ftunivzuerich |
language |
English |
topic |
Institute of Geography 910 Geography & travel |
spellingShingle |
Institute of Geography 910 Geography & travel Dal Farra, Anna Kaspari, Susan Beach, James Bucheli, Thomas D Schaepman, Michael E Schwikowski, Margit Spectral signatures of submicron scale light-absorbing impurities in snow and ice using hyperspectral microscopy |
topic_facet |
Institute of Geography 910 Geography & travel |
description |
Light-absorbing impurities (LAI) can darken snow and ice surfaces, reduce snow/ice albedo and accelerate melt. Efforts to allocate the relative contribution of different LAI to snow/ice albedo reductions have been limited by uncertainties in the optical properties of LAI. We developed a new method to measure LAI spectral reflectance at the submicron scale by modifying a Hyperspectral Imaging Microscope Spectrometer (HIMS). We present the instrument's internal calibration, and the overall small influence of a particle's orientation on its measured reflectance spectrum. We validated this new method through the comparison with a field spectroradiometer by measuring different standard materials. Measurements with HIMS at the submicron scale and the bulk measurements of the same standard materials with the field spectroradiometer are in good agreement with an average deviation between the spectra of 3.2% for the 400–1000 nm wavelength range. The new method was used (1) to identify BC (black carbon), mineral dust including hematite and the humic substances present in an environmental sample from Plaine Morte glacier and (2) to collect the individual reflectance spectra of each of these types of impurity. The results indicate that this method is applicable to heterogeneous samples such as the LAI found in snow and ice. |
format |
Article in Journal/Newspaper |
author |
Dal Farra, Anna Kaspari, Susan Beach, James Bucheli, Thomas D Schaepman, Michael E Schwikowski, Margit |
author_facet |
Dal Farra, Anna Kaspari, Susan Beach, James Bucheli, Thomas D Schaepman, Michael E Schwikowski, Margit |
author_sort |
Dal Farra, Anna |
title |
Spectral signatures of submicron scale light-absorbing impurities in snow and ice using hyperspectral microscopy |
title_short |
Spectral signatures of submicron scale light-absorbing impurities in snow and ice using hyperspectral microscopy |
title_full |
Spectral signatures of submicron scale light-absorbing impurities in snow and ice using hyperspectral microscopy |
title_fullStr |
Spectral signatures of submicron scale light-absorbing impurities in snow and ice using hyperspectral microscopy |
title_full_unstemmed |
Spectral signatures of submicron scale light-absorbing impurities in snow and ice using hyperspectral microscopy |
title_sort |
spectral signatures of submicron scale light-absorbing impurities in snow and ice using hyperspectral microscopy |
publisher |
International Glaciological Society |
publishDate |
2018 |
url |
https://www.zora.uzh.ch/id/eprint/160709/ https://www.zora.uzh.ch/id/eprint/160709/1/2018_spectral_signatures_of_submicron_scale_lightab.pdf https://doi.org/10.5167/uzh-160709 https://doi.org/10.1017/jog.2018.29 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Dal Farra, Anna; Kaspari, Susan; Beach, James; Bucheli, Thomas D; Schaepman, Michael E; Schwikowski, Margit (2018). Spectral signatures of submicron scale light-absorbing impurities in snow and ice using hyperspectral microscopy. Journal of Glaciology, 64(245):377-386. |
op_relation |
https://www.zora.uzh.ch/id/eprint/160709/1/2018_spectral_signatures_of_submicron_scale_lightab.pdf doi:10.5167/uzh-160709 doi:10.1017/jog.2018.29 urn:issn:0022-1430 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons: Attribution 4.0 International (CC BY 4.0) http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.5167/uzh-16070910.1017/jog.2018.29 |
_version_ |
1810453633600323584 |