Relating optical and microwave grain metrics of snow: the relevance of grain shape
Grain shape is commonly understood as a morphological characteristic of snow that is independent of the optical diameter (or specific surface area) influencing its physical properties. In this study we use tomography images to investigate two objectively defined metrics of grain shape that naturally...
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2016
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00011181 2023-05-15T18:32:32+02:00 Relating optical and microwave grain metrics of snow: the relevance of grain shape Krol, Quirine Löwe, Henning 2016-11 electronic https://doi.org/10.5194/tc-10-2847-2016 https://noa.gwlb.de/receive/cop_mods_00011181 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011138/tc-10-2847-2016.pdf https://tc.copernicus.org/articles/10/2847/2016/tc-10-2847-2016.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-10-2847-2016 https://noa.gwlb.de/receive/cop_mods_00011181 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011138/tc-10-2847-2016.pdf https://tc.copernicus.org/articles/10/2847/2016/tc-10-2847-2016.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2016 ftnonlinearchiv https://doi.org/10.5194/tc-10-2847-2016 2022-02-08T22:56:40Z Grain shape is commonly understood as a morphological characteristic of snow that is independent of the optical diameter (or specific surface area) influencing its physical properties. In this study we use tomography images to investigate two objectively defined metrics of grain shape that naturally extend the characterization of snow in terms of the optical diameter. One is the curvature length λ2, related to the third-order term in the expansion of the two-point correlation function, and the other is the second moment μ2 of the chord length distributions. We show that the exponential correlation length, widely used for microwave modeling, can be related to the optical diameter and λ2. Likewise, we show that the absorption enhancement parameter B and the asymmetry factor gG, required for optical modeling, can be related to the optical diameter and μ2. We establish various statistical relations between all size metrics obtained from the two-point correlation function and the chord length distribution. Overall our results suggest that the characterization of grain shape via λ2 or μ2 is virtually equivalent since both capture similar aspects of size dispersity. Our results provide a common ground for the different grain metrics required for optical and microwave modeling of snow. Article in Journal/Newspaper The Cryosphere Niedersächsisches Online-Archiv NOA The Cryosphere 10 6 2847 2863 |
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article Verlagsveröffentlichung Krol, Quirine Löwe, Henning Relating optical and microwave grain metrics of snow: the relevance of grain shape |
topic_facet |
article Verlagsveröffentlichung |
description |
Grain shape is commonly understood as a morphological characteristic of snow that is independent of the optical diameter (or specific surface area) influencing its physical properties. In this study we use tomography images to investigate two objectively defined metrics of grain shape that naturally extend the characterization of snow in terms of the optical diameter. One is the curvature length λ2, related to the third-order term in the expansion of the two-point correlation function, and the other is the second moment μ2 of the chord length distributions. We show that the exponential correlation length, widely used for microwave modeling, can be related to the optical diameter and λ2. Likewise, we show that the absorption enhancement parameter B and the asymmetry factor gG, required for optical modeling, can be related to the optical diameter and μ2. We establish various statistical relations between all size metrics obtained from the two-point correlation function and the chord length distribution. Overall our results suggest that the characterization of grain shape via λ2 or μ2 is virtually equivalent since both capture similar aspects of size dispersity. Our results provide a common ground for the different grain metrics required for optical and microwave modeling of snow. |
format |
Article in Journal/Newspaper |
author |
Krol, Quirine Löwe, Henning |
author_facet |
Krol, Quirine Löwe, Henning |
author_sort |
Krol, Quirine |
title |
Relating optical and microwave grain metrics of snow: the relevance of grain shape |
title_short |
Relating optical and microwave grain metrics of snow: the relevance of grain shape |
title_full |
Relating optical and microwave grain metrics of snow: the relevance of grain shape |
title_fullStr |
Relating optical and microwave grain metrics of snow: the relevance of grain shape |
title_full_unstemmed |
Relating optical and microwave grain metrics of snow: the relevance of grain shape |
title_sort |
relating optical and microwave grain metrics of snow: the relevance of grain shape |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/tc-10-2847-2016 https://noa.gwlb.de/receive/cop_mods_00011181 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011138/tc-10-2847-2016.pdf https://tc.copernicus.org/articles/10/2847/2016/tc-10-2847-2016.pdf |
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The Cryosphere |
genre_facet |
The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-10-2847-2016 https://noa.gwlb.de/receive/cop_mods_00011181 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011138/tc-10-2847-2016.pdf https://tc.copernicus.org/articles/10/2847/2016/tc-10-2847-2016.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-10-2847-2016 |
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The Cryosphere |
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2847 |
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