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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ftdoajarticles:oai:doaj.org/article:98ebda51174f466ba2129786d5deefc6 2023-05-15T18:32:30+02:00 Tilt error in cryospheric surface radiation measurements at high latitudes: a model study W. S. Bogren J. F. Burkhart A. Kylling 2016-03-01T00:00:00Z https://doi.org/10.5194/tc-10-613-2016 https://doaj.org/article/98ebda51174f466ba2129786d5deefc6 EN eng Copernicus Publications http://www.the-cryosphere.net/10/613/2016/tc-10-613-2016.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-10-613-2016 https://doaj.org/article/98ebda51174f466ba2129786d5deefc6 The Cryosphere, Vol 10, Iss 2, Pp 613-622 (2016) Environmental sciences GE1-350 Geology QE1-996.5 article 2016 ftdoajarticles https://doi.org/10.5194/tc-10-613-2016 2022-12-30T21:54:08Z 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 Directory of Open Access Journals: DOAJ Articles The Cryosphere 10 2 613 622 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 W. S. Bogren J. F. Burkhart A. Kylling Tilt error in cryospheric surface radiation measurements at high latitudes: a model study |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
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 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 |
http://www.the-cryosphere.net/10/613/2016/tc-10-613-2016.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-10-613-2016 https://doaj.org/article/98ebda51174f466ba2129786d5deefc6 |
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 |
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1766216617865248768 |