Anisotropic reflectance of Arctic snow and sea ice
We present an investigation of the angular distribution of reflected light on snow and sea ice, for three selected wavelengths; 500, 800 and 1100 nm. Our analysis covers how the angular reflectance distribution is affected by varying the solar zenith angle and cloud configuration, and also if snow g...
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The University of Bergen
2017
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ftunivbergen:oai:bora.uib.no:1956/17240 2023-05-15T14:28:55+02:00 Anisotropic reflectance of Arctic snow and sea ice Henningsen, Hanne Starfish 2017-12-20T23:00:02Z application/pdf https://hdl.handle.net/1956/17240 eng eng The University of Bergen https://hdl.handle.net/1956/17240 Copyright the Author. All rights reserved optics arf reflection Arctic snow Sea ice 752199 Master thesis 2017 ftunivbergen 2023-03-14T17:39:06Z We present an investigation of the angular distribution of reflected light on snow and sea ice, for three selected wavelengths; 500, 800 and 1100 nm. Our analysis covers how the angular reflectance distribution is affected by varying the solar zenith angle and cloud configuration, and also if snow grain size and snow thickness will has an influence. We have mainly addressed snow reflective properties, as snow is a key player in the earth’s radiation budget. With an accurate radiative transfer simulation tool (AccuRT), we have simulated various cloud, snow and sea ice scenarios. Our main conclusion is that neither snow or sea ice seems to reflect light isotropically over the upper hemisphere, and that the presence of even thin clouds contribute to extensively to the diffusing of light. The effect is most prominent for 500 nm light, while for longer wavelengths the diffusing effect happens at a slower rate, leaving detectable signals on small cloud variations. For a typical cloud configuration, a cloud thickness of more than 100 m will diffuse the incident light to an extent where we can not distinguish the incident solar angle based on angular distribution plots. In April 2016 we collected spectral radiation data on three different locations on the arctic archipelago of Svalbard. This data has been assessed in light of the modelled results, proving to support our hypothesis of the wavelength dependency of the clouds diffusing effects. We found that a thicker cloud cover will shift the detected average angle of the incident light towards the average polar angle (45◦). Masteroppgave i fysikk PHYS399 Master Thesis Arctic Archipelago Arctic Sea ice Svalbard University of Bergen: Bergen Open Research Archive (BORA-UiB) Arctic Svalbard |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
optics arf reflection Arctic snow Sea ice 752199 |
spellingShingle |
optics arf reflection Arctic snow Sea ice 752199 Henningsen, Hanne Starfish Anisotropic reflectance of Arctic snow and sea ice |
topic_facet |
optics arf reflection Arctic snow Sea ice 752199 |
description |
We present an investigation of the angular distribution of reflected light on snow and sea ice, for three selected wavelengths; 500, 800 and 1100 nm. Our analysis covers how the angular reflectance distribution is affected by varying the solar zenith angle and cloud configuration, and also if snow grain size and snow thickness will has an influence. We have mainly addressed snow reflective properties, as snow is a key player in the earth’s radiation budget. With an accurate radiative transfer simulation tool (AccuRT), we have simulated various cloud, snow and sea ice scenarios. Our main conclusion is that neither snow or sea ice seems to reflect light isotropically over the upper hemisphere, and that the presence of even thin clouds contribute to extensively to the diffusing of light. The effect is most prominent for 500 nm light, while for longer wavelengths the diffusing effect happens at a slower rate, leaving detectable signals on small cloud variations. For a typical cloud configuration, a cloud thickness of more than 100 m will diffuse the incident light to an extent where we can not distinguish the incident solar angle based on angular distribution plots. In April 2016 we collected spectral radiation data on three different locations on the arctic archipelago of Svalbard. This data has been assessed in light of the modelled results, proving to support our hypothesis of the wavelength dependency of the clouds diffusing effects. We found that a thicker cloud cover will shift the detected average angle of the incident light towards the average polar angle (45◦). Masteroppgave i fysikk PHYS399 |
format |
Master Thesis |
author |
Henningsen, Hanne Starfish |
author_facet |
Henningsen, Hanne Starfish |
author_sort |
Henningsen, Hanne Starfish |
title |
Anisotropic reflectance of Arctic snow and sea ice |
title_short |
Anisotropic reflectance of Arctic snow and sea ice |
title_full |
Anisotropic reflectance of Arctic snow and sea ice |
title_fullStr |
Anisotropic reflectance of Arctic snow and sea ice |
title_full_unstemmed |
Anisotropic reflectance of Arctic snow and sea ice |
title_sort |
anisotropic reflectance of arctic snow and sea ice |
publisher |
The University of Bergen |
publishDate |
2017 |
url |
https://hdl.handle.net/1956/17240 |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Archipelago Arctic Sea ice Svalbard |
genre_facet |
Arctic Archipelago Arctic Sea ice Svalbard |
op_relation |
https://hdl.handle.net/1956/17240 |
op_rights |
Copyright the Author. All rights reserved |
_version_ |
1766303042785771520 |