Solar irradiance in the heterogeneous albedo environment of the Arctic coast: measurements and a 3-D model study
We present a unique case study of the solar global irradiance in a highly heterogeneous albedo environment at the Arctic coast. Diodearray spectroradiometers were deployed at three sites around Ny Ålesund, Svalbard, and spectral irradiances were simultaneously measured under clear-sky conditions dur...
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ftdoajarticles:oai:doaj.org/article:ffb16339a7944a83a21f80eaa333acae 2023-05-15T13:11:00+02:00 Solar irradiance in the heterogeneous albedo environment of the Arctic coast: measurements and a 3-D model study A. Kreuter R. Buras B. Mayer A. Webb R. Kift A. Bais N. Kouremeti M. Blumthaler 2014-06-01T00:00:00Z https://doi.org/10.5194/acp-14-5989-2014 https://doaj.org/article/ffb16339a7944a83a21f80eaa333acae EN eng Copernicus Publications http://www.atmos-chem-phys.net/14/5989/2014/acp-14-5989-2014.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 doi:10.5194/acp-14-5989-2014 https://doaj.org/article/ffb16339a7944a83a21f80eaa333acae Atmospheric Chemistry and Physics, Vol 14, Iss 12, Pp 5989-6002 (2014) Physics QC1-999 Chemistry QD1-999 article 2014 ftdoajarticles https://doi.org/10.5194/acp-14-5989-2014 2022-12-31T16:01:02Z We present a unique case study of the solar global irradiance in a highly heterogeneous albedo environment at the Arctic coast. Diodearray spectroradiometers were deployed at three sites around Ny Ålesund, Svalbard, and spectral irradiances were simultaneously measured under clear-sky conditions during a 24 h period. The 3-D radiative transfer model MYSTIC is applied to simulate the measurements in various model scenarios. First, we model the effective albedos of ocean and snow and consequently around each measurement site. The effective albedos at 340 nm increase from 0.57 to 0.75, from the coastal site in the west towards the site 20 km east, away from the coast. The observed ratios of the global irradiance indicate a 15% higher average irradiance, at 340 nm east relative to west, due to the higher albedo. The comparison of our model scenarios suggest a snow albedo of > 0.9 and confirm the observation that drift ice has moved into the Fjord during the day. The local time shift between the locations causes a hysteresis-like behavior of these east–west ratios with solar zenith angle (SZA). The observed hysteresis, however, is larger and, at 340 nm, can be explained by the drift ice. At 500 nm, a plausible explanation is a detector tilt of about 1°. The ratios between afternoon and morning irradiances at the same SZA are investigated, which confirm the above conclusions. At the coastal site, the measured irradiance is significantly higher in the afternoon than in the morning. Besides the effect of changing drift ice and detector tilt, the small variations of the aerosol optical depth have to be considered also at the other stations to reduce the discrepancies between model and observations. Remaining discrepancies are possibly due to distant high clouds. Article in Journal/Newspaper albedo Arctic Ny Ålesund Ny-Ålesund Svalbard Directory of Open Access Journals: DOAJ Articles Arctic Ny-Ålesund Svalbard Atmospheric Chemistry and Physics 14 12 5989 6002 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 A. Kreuter R. Buras B. Mayer A. Webb R. Kift A. Bais N. Kouremeti M. Blumthaler Solar irradiance in the heterogeneous albedo environment of the Arctic coast: measurements and a 3-D model study |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
We present a unique case study of the solar global irradiance in a highly heterogeneous albedo environment at the Arctic coast. Diodearray spectroradiometers were deployed at three sites around Ny Ålesund, Svalbard, and spectral irradiances were simultaneously measured under clear-sky conditions during a 24 h period. The 3-D radiative transfer model MYSTIC is applied to simulate the measurements in various model scenarios. First, we model the effective albedos of ocean and snow and consequently around each measurement site. The effective albedos at 340 nm increase from 0.57 to 0.75, from the coastal site in the west towards the site 20 km east, away from the coast. The observed ratios of the global irradiance indicate a 15% higher average irradiance, at 340 nm east relative to west, due to the higher albedo. The comparison of our model scenarios suggest a snow albedo of > 0.9 and confirm the observation that drift ice has moved into the Fjord during the day. The local time shift between the locations causes a hysteresis-like behavior of these east–west ratios with solar zenith angle (SZA). The observed hysteresis, however, is larger and, at 340 nm, can be explained by the drift ice. At 500 nm, a plausible explanation is a detector tilt of about 1°. The ratios between afternoon and morning irradiances at the same SZA are investigated, which confirm the above conclusions. At the coastal site, the measured irradiance is significantly higher in the afternoon than in the morning. Besides the effect of changing drift ice and detector tilt, the small variations of the aerosol optical depth have to be considered also at the other stations to reduce the discrepancies between model and observations. Remaining discrepancies are possibly due to distant high clouds. |
format |
Article in Journal/Newspaper |
author |
A. Kreuter R. Buras B. Mayer A. Webb R. Kift A. Bais N. Kouremeti M. Blumthaler |
author_facet |
A. Kreuter R. Buras B. Mayer A. Webb R. Kift A. Bais N. Kouremeti M. Blumthaler |
author_sort |
A. Kreuter |
title |
Solar irradiance in the heterogeneous albedo environment of the Arctic coast: measurements and a 3-D model study |
title_short |
Solar irradiance in the heterogeneous albedo environment of the Arctic coast: measurements and a 3-D model study |
title_full |
Solar irradiance in the heterogeneous albedo environment of the Arctic coast: measurements and a 3-D model study |
title_fullStr |
Solar irradiance in the heterogeneous albedo environment of the Arctic coast: measurements and a 3-D model study |
title_full_unstemmed |
Solar irradiance in the heterogeneous albedo environment of the Arctic coast: measurements and a 3-D model study |
title_sort |
solar irradiance in the heterogeneous albedo environment of the arctic coast: measurements and a 3-d model study |
publisher |
Copernicus Publications |
publishDate |
2014 |
url |
https://doi.org/10.5194/acp-14-5989-2014 https://doaj.org/article/ffb16339a7944a83a21f80eaa333acae |
geographic |
Arctic Ny-Ålesund Svalbard |
geographic_facet |
Arctic Ny-Ålesund Svalbard |
genre |
albedo Arctic Ny Ålesund Ny-Ålesund Svalbard |
genre_facet |
albedo Arctic Ny Ålesund Ny-Ålesund Svalbard |
op_source |
Atmospheric Chemistry and Physics, Vol 14, Iss 12, Pp 5989-6002 (2014) |
op_relation |
http://www.atmos-chem-phys.net/14/5989/2014/acp-14-5989-2014.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 doi:10.5194/acp-14-5989-2014 https://doaj.org/article/ffb16339a7944a83a21f80eaa333acae |
op_doi |
https://doi.org/10.5194/acp-14-5989-2014 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
14 |
container_issue |
12 |
container_start_page |
5989 |
op_container_end_page |
6002 |
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1766245541528731648 |