Tilt error in cryospheric surface radiation measurements at high latitudes: a model study
We have evaluated the magnitude and makeup of error in cryospheric radiation observations due to small sensor misalignment in in situ measurements of solar irradiance. This error is examined through simulation of diffuse and direct irradiance arriving at a detector with a cosine-response fore optic....
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Copernicus Publications
2016
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fttriple:oai:gotriple.eu:oai:doaj.org/article:98ebda51174f466ba2129786d5deefc6 2023-05-15T18:32:21+02:00 Tilt error in cryospheric surface radiation measurements at high latitudes: a model study W. S. Bogren J. F. Burkhart A. Kylling 2016-03-01 https://doi.org/10.5194/tc-10-613-2016 http://www.the-cryosphere.net/10/613/2016/tc-10-613-2016.pdf https://doaj.org/article/98ebda51174f466ba2129786d5deefc6 en eng Copernicus Publications 1994-0416 1994-0424 doi:10.5194/tc-10-613-2016 http://www.the-cryosphere.net/10/613/2016/tc-10-613-2016.pdf https://doaj.org/article/98ebda51174f466ba2129786d5deefc6 undefined The Cryosphere, Vol 10, Iss 2, Pp 613-622 (2016) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2016 fttriple https://doi.org/10.5194/tc-10-613-2016 2023-01-22T19:19:09Z We have evaluated the magnitude and makeup of error in cryospheric radiation observations due to small sensor misalignment in in situ measurements of solar irradiance. This error is examined through simulation of diffuse and direct irradiance arriving at a detector with a cosine-response fore optic. Emphasis is placed on assessing total error over the solar shortwave spectrum from 250 to 4500 nm, as well as supporting investigation over other relevant shortwave spectral ranges. The total measurement error introduced by sensor tilt is dominated by the direct component. For a typical high-latitude albedo measurement with a solar zenith angle of 60°, a sensor tilted by 1, 3, and 5° can, respectively introduce up to 2.7, 8.1, and 13.5 % error into the measured irradiance and similar errors in the derived albedo. Depending on the daily range of solar azimuth and zenith angles, significant measurement error can persist also in integrated daily irradiance and albedo. Simulations including a cloud layer demonstrate decreasing tilt error with increasing cloud optical depth. Article in Journal/Newspaper The Cryosphere Unknown The Cryosphere 10 2 613 622 |
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English |
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geo envir |
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geo envir W. S. Bogren J. F. Burkhart A. Kylling Tilt error in cryospheric surface radiation measurements at high latitudes: a model study |
topic_facet |
geo envir |
description |
We have evaluated the magnitude and makeup of error in cryospheric radiation observations due to small sensor misalignment in in situ measurements of solar irradiance. This error is examined through simulation of diffuse and direct irradiance arriving at a detector with a cosine-response fore optic. Emphasis is placed on assessing total error over the solar shortwave spectrum from 250 to 4500 nm, as well as supporting investigation over other relevant shortwave spectral ranges. The total measurement error introduced by sensor tilt is dominated by the direct component. For a typical high-latitude albedo measurement with a solar zenith angle of 60°, a sensor tilted by 1, 3, and 5° can, respectively introduce up to 2.7, 8.1, and 13.5 % error into the measured irradiance and similar errors in the derived albedo. Depending on the daily range of solar azimuth and zenith angles, significant measurement error can persist also in integrated daily irradiance and albedo. Simulations including a cloud layer demonstrate decreasing tilt error with increasing cloud optical depth. |
format |
Article in Journal/Newspaper |
author |
W. S. Bogren J. F. Burkhart A. Kylling |
author_facet |
W. S. Bogren J. F. Burkhart A. Kylling |
author_sort |
W. S. Bogren |
title |
Tilt error in cryospheric surface radiation measurements at high latitudes: a model study |
title_short |
Tilt error in cryospheric surface radiation measurements at high latitudes: a model study |
title_full |
Tilt error in cryospheric surface radiation measurements at high latitudes: a model study |
title_fullStr |
Tilt error in cryospheric surface radiation measurements at high latitudes: a model study |
title_full_unstemmed |
Tilt error in cryospheric surface radiation measurements at high latitudes: a model study |
title_sort |
tilt error in cryospheric surface radiation measurements at high latitudes: a model study |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/tc-10-613-2016 http://www.the-cryosphere.net/10/613/2016/tc-10-613-2016.pdf https://doaj.org/article/98ebda51174f466ba2129786d5deefc6 |
genre |
The Cryosphere |
genre_facet |
The Cryosphere |
op_source |
The Cryosphere, Vol 10, Iss 2, Pp 613-622 (2016) |
op_relation |
1994-0416 1994-0424 doi:10.5194/tc-10-613-2016 http://www.the-cryosphere.net/10/613/2016/tc-10-613-2016.pdf https://doaj.org/article/98ebda51174f466ba2129786d5deefc6 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/tc-10-613-2016 |
container_title |
The Cryosphere |
container_volume |
10 |
container_issue |
2 |
container_start_page |
613 |
op_container_end_page |
622 |
_version_ |
1766216450571239424 |