A simple and robust CryoSat-2 radar freeboard correction method dedicated to TFMRA50 for the Arctic winter snow depth and sea ice thickness retrieval
When deriving the sea ice thickness using a satellite radar altimeter, a correction is needed to convert the radar freeboard to the ice freeboard. Here, a robust correction method for the CryoSat-2 radar freeboard derived using the Threshold First-Maximum Retracker Algorithm with a 50% threshold (TF...
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2024
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Online Access: | http://dx.doi.org/10.22541/essoar.171500700.06739421/v1 |
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crwinnower:10.22541/essoar.171500700.06739421/v1 2024-06-02T08:02:19+00:00 A simple and robust CryoSat-2 radar freeboard correction method dedicated to TFMRA50 for the Arctic winter snow depth and sea ice thickness retrieval Shi, Hoyeon Tonboe, Rasmus Lee, Sang-Moo Dybkjær, Gorm Sohn, Byung-Ju Singha, Suman Baordo, Fabrizio 2024 http://dx.doi.org/10.22541/essoar.171500700.06739421/v1 unknown Authorea, Inc. https://creativecommons.org/licenses/by-nc-sa/4.0/ posted-content 2024 crwinnower https://doi.org/10.22541/essoar.171500700.06739421/v1 2024-05-07T14:19:26Z When deriving the sea ice thickness using a satellite radar altimeter, a correction is needed to convert the radar freeboard to the ice freeboard. Here, a robust correction method for the CryoSat-2 radar freeboard derived using the Threshold First-Maximum Retracker Algorithm with a 50% threshold (TFMRA50) is proposed. Snow depth was used as a predictor for the correction, similar to the traditional wave speed correction, but the coefficients were empirically determined by performing a direct comparison of the radar freeboard from CryoSat-2 and the ice freeboard from airborne observations. Consequently, this new empirical correction treats the physical effects (e.g., changes in wave propagation speed and the distribution of scattering at the snow and ice surfaces, etc.) and the retracker bias as a whole, which have been difficult to separate in the retrieval process. In this paper, we demonstrate that the retrieval accuracy of snow and ice variables and the consistency of the two independent retrieval methods are improved when the new correction is applied. The result of this study emphasizes the importance of compatibility between the retracker and the freeboard correction method. Other/Unknown Material Arctic Sea ice The Winnower Arctic |
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Open Polar |
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The Winnower |
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crwinnower |
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description |
When deriving the sea ice thickness using a satellite radar altimeter, a correction is needed to convert the radar freeboard to the ice freeboard. Here, a robust correction method for the CryoSat-2 radar freeboard derived using the Threshold First-Maximum Retracker Algorithm with a 50% threshold (TFMRA50) is proposed. Snow depth was used as a predictor for the correction, similar to the traditional wave speed correction, but the coefficients were empirically determined by performing a direct comparison of the radar freeboard from CryoSat-2 and the ice freeboard from airborne observations. Consequently, this new empirical correction treats the physical effects (e.g., changes in wave propagation speed and the distribution of scattering at the snow and ice surfaces, etc.) and the retracker bias as a whole, which have been difficult to separate in the retrieval process. In this paper, we demonstrate that the retrieval accuracy of snow and ice variables and the consistency of the two independent retrieval methods are improved when the new correction is applied. The result of this study emphasizes the importance of compatibility between the retracker and the freeboard correction method. |
format |
Other/Unknown Material |
author |
Shi, Hoyeon Tonboe, Rasmus Lee, Sang-Moo Dybkjær, Gorm Sohn, Byung-Ju Singha, Suman Baordo, Fabrizio |
spellingShingle |
Shi, Hoyeon Tonboe, Rasmus Lee, Sang-Moo Dybkjær, Gorm Sohn, Byung-Ju Singha, Suman Baordo, Fabrizio A simple and robust CryoSat-2 radar freeboard correction method dedicated to TFMRA50 for the Arctic winter snow depth and sea ice thickness retrieval |
author_facet |
Shi, Hoyeon Tonboe, Rasmus Lee, Sang-Moo Dybkjær, Gorm Sohn, Byung-Ju Singha, Suman Baordo, Fabrizio |
author_sort |
Shi, Hoyeon |
title |
A simple and robust CryoSat-2 radar freeboard correction method dedicated to TFMRA50 for the Arctic winter snow depth and sea ice thickness retrieval |
title_short |
A simple and robust CryoSat-2 radar freeboard correction method dedicated to TFMRA50 for the Arctic winter snow depth and sea ice thickness retrieval |
title_full |
A simple and robust CryoSat-2 radar freeboard correction method dedicated to TFMRA50 for the Arctic winter snow depth and sea ice thickness retrieval |
title_fullStr |
A simple and robust CryoSat-2 radar freeboard correction method dedicated to TFMRA50 for the Arctic winter snow depth and sea ice thickness retrieval |
title_full_unstemmed |
A simple and robust CryoSat-2 radar freeboard correction method dedicated to TFMRA50 for the Arctic winter snow depth and sea ice thickness retrieval |
title_sort |
simple and robust cryosat-2 radar freeboard correction method dedicated to tfmra50 for the arctic winter snow depth and sea ice thickness retrieval |
publisher |
Authorea, Inc. |
publishDate |
2024 |
url |
http://dx.doi.org/10.22541/essoar.171500700.06739421/v1 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Sea ice |
genre_facet |
Arctic Sea ice |
op_rights |
https://creativecommons.org/licenses/by-nc-sa/4.0/ |
op_doi |
https://doi.org/10.22541/essoar.171500700.06739421/v1 |
_version_ |
1800746827558944768 |