New insights into radiative transfer in sea ice derived from autonomous ice internal measurements
The radiative transfer of short-wave solar radiation through the sea ice cover of the polar oceans is a crucial aspect of energy partitioning at the atmosphere-ice-ocean interface. A detailed understanding of how sunlight is reflected and transmitted by the sea ice cover is needed for an accurate re...
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ftcopernicus:oai:publications.copernicus.org:tcd86672 2023-05-15T16:39:31+02:00 New insights into radiative transfer in sea ice derived from autonomous ice internal measurements Katlein, Christian Valcic, Lovro Lambert-Girard, Simon Hoppmann, Mario 2020-08-07 application/pdf https://doi.org/10.5194/tc-2020-184 https://tc.copernicus.org/preprints/tc-2020-184/ eng eng doi:10.5194/tc-2020-184 https://tc.copernicus.org/preprints/tc-2020-184/ eISSN: 1994-0424 Text 2020 ftcopernicus https://doi.org/10.5194/tc-2020-184 2020-08-10T16:22:00Z The radiative transfer of short-wave solar radiation through the sea ice cover of the polar oceans is a crucial aspect of energy partitioning at the atmosphere-ice-ocean interface. A detailed understanding of how sunlight is reflected and transmitted by the sea ice cover is needed for an accurate representation of critical processes in climate and ecosystem models, such as the ice-albedo feedback. Due to the challenges associated with ice internal measurements, most information about radiative transfer in sea ice has been gained by optical measurements above and below the sea ice. To improve our understanding of radiative transfer processes within the ice itself, we developed a new kind of instrument equipped with a number of multispectral light sensors that can be frozen into the ice. A first prototype consisting of a 2.3 m long chain of 48 sideward planar irradiance sensors with a vertical spacing of 0.05 m was deployed at the geographic North Pole in late August 2018, providing autonomous, vertically resolved light measurements within the ice cover during the autumn season. Here we present the first results of this instrument, discuss the advantages and application of the prototype and provide first new insights into the spatiotemporal aspect of radiative transfer within the sea ice itself. In particular, we investigate how measured attenuation coefficients relate to the optical properties of the ice pack, and show that sideward planar irradiance measurements are equivalent to measurements of total scalar irradiance. Text ice pack North Pole Sea ice Copernicus Publications: E-Journals North Pole |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
The radiative transfer of short-wave solar radiation through the sea ice cover of the polar oceans is a crucial aspect of energy partitioning at the atmosphere-ice-ocean interface. A detailed understanding of how sunlight is reflected and transmitted by the sea ice cover is needed for an accurate representation of critical processes in climate and ecosystem models, such as the ice-albedo feedback. Due to the challenges associated with ice internal measurements, most information about radiative transfer in sea ice has been gained by optical measurements above and below the sea ice. To improve our understanding of radiative transfer processes within the ice itself, we developed a new kind of instrument equipped with a number of multispectral light sensors that can be frozen into the ice. A first prototype consisting of a 2.3 m long chain of 48 sideward planar irradiance sensors with a vertical spacing of 0.05 m was deployed at the geographic North Pole in late August 2018, providing autonomous, vertically resolved light measurements within the ice cover during the autumn season. Here we present the first results of this instrument, discuss the advantages and application of the prototype and provide first new insights into the spatiotemporal aspect of radiative transfer within the sea ice itself. In particular, we investigate how measured attenuation coefficients relate to the optical properties of the ice pack, and show that sideward planar irradiance measurements are equivalent to measurements of total scalar irradiance. |
format |
Text |
author |
Katlein, Christian Valcic, Lovro Lambert-Girard, Simon Hoppmann, Mario |
spellingShingle |
Katlein, Christian Valcic, Lovro Lambert-Girard, Simon Hoppmann, Mario New insights into radiative transfer in sea ice derived from autonomous ice internal measurements |
author_facet |
Katlein, Christian Valcic, Lovro Lambert-Girard, Simon Hoppmann, Mario |
author_sort |
Katlein, Christian |
title |
New insights into radiative transfer in sea ice derived from autonomous ice internal measurements |
title_short |
New insights into radiative transfer in sea ice derived from autonomous ice internal measurements |
title_full |
New insights into radiative transfer in sea ice derived from autonomous ice internal measurements |
title_fullStr |
New insights into radiative transfer in sea ice derived from autonomous ice internal measurements |
title_full_unstemmed |
New insights into radiative transfer in sea ice derived from autonomous ice internal measurements |
title_sort |
new insights into radiative transfer in sea ice derived from autonomous ice internal measurements |
publishDate |
2020 |
url |
https://doi.org/10.5194/tc-2020-184 https://tc.copernicus.org/preprints/tc-2020-184/ |
geographic |
North Pole |
geographic_facet |
North Pole |
genre |
ice pack North Pole Sea ice |
genre_facet |
ice pack North Pole Sea ice |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-2020-184 https://tc.copernicus.org/preprints/tc-2020-184/ |
op_doi |
https://doi.org/10.5194/tc-2020-184 |
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1766029862741475328 |