Summer sea ice floe perimeter density in the Arctic: high-resolution optical satellite imagery and model evaluation
Size distribution of sea ice floes is an important component for sea ice thermodynamic and dynamic processes, particularly in the marginal ice zone. Recently processes related to the floe size distribution (FSD) have been incorporated into sea ice models, but the sparsity of existing observations li...
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ftcopernicus:oai:publications.copernicus.org:tc104758 2023-09-26T15:14:40+02:00 Summer sea ice floe perimeter density in the Arctic: high-resolution optical satellite imagery and model evaluation Wang, Yanan Hwang, Byongjun Bateson, Adam William Aksenov, Yevgeny Horvat, Christopher 2023-08-25 application/pdf https://doi.org/10.5194/tc-17-3575-2023 https://tc.copernicus.org/articles/17/3575/2023/ eng eng doi:10.5194/tc-17-3575-2023 https://tc.copernicus.org/articles/17/3575/2023/ eISSN: 1994-0424 Text 2023 ftcopernicus https://doi.org/10.5194/tc-17-3575-2023 2023-08-28T16:24:15Z Size distribution of sea ice floes is an important component for sea ice thermodynamic and dynamic processes, particularly in the marginal ice zone. Recently processes related to the floe size distribution (FSD) have been incorporated into sea ice models, but the sparsity of existing observations limits the evaluation of FSD models, thus hindering model improvements. In this study, perimeter density has been applied to characterise the floe size distribution for evaluating three FSD models – the Waves-in-Ice module and Power law Floe Size Distribution (WIPoFSD) model and two branches of a fully prognostic floe size-thickness distribution model: CPOM-FSD and FSDv2-WAVE. These models are evaluated against a new FSD dataset derived from high-resolution satellite imagery in the Arctic. The evaluation shows an overall overestimation of floe perimeter density by the models against the observations. Comparison of the floe perimeter density distribution with the observations shows that the models exhibit a much larger proportion for small floes (radius < 10 –30 m) but a much smaller proportion for large floes (radius > 30 –50 m). Observations and the WIPoFSD model both show a negative correlation between sea ice concentration and the floe perimeter density, but the two prognostic models (CPOM-FSD and FSDv2-WAVE) show the opposite pattern. These differences between models and the observations may be attributed to limitations in the observations (e.g. the image resolution is not sufficient to detect small floes) or limitations in the model parameterisations, including the use of a global power-law exponent in the WIPoFSD model as well as too weak a floe welding and enhanced wave fracture in the prognostic models. Text Arctic Sea ice Copernicus Publications: E-Journals Arctic The Cryosphere 17 8 3575 3591 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
Size distribution of sea ice floes is an important component for sea ice thermodynamic and dynamic processes, particularly in the marginal ice zone. Recently processes related to the floe size distribution (FSD) have been incorporated into sea ice models, but the sparsity of existing observations limits the evaluation of FSD models, thus hindering model improvements. In this study, perimeter density has been applied to characterise the floe size distribution for evaluating three FSD models – the Waves-in-Ice module and Power law Floe Size Distribution (WIPoFSD) model and two branches of a fully prognostic floe size-thickness distribution model: CPOM-FSD and FSDv2-WAVE. These models are evaluated against a new FSD dataset derived from high-resolution satellite imagery in the Arctic. The evaluation shows an overall overestimation of floe perimeter density by the models against the observations. Comparison of the floe perimeter density distribution with the observations shows that the models exhibit a much larger proportion for small floes (radius < 10 –30 m) but a much smaller proportion for large floes (radius > 30 –50 m). Observations and the WIPoFSD model both show a negative correlation between sea ice concentration and the floe perimeter density, but the two prognostic models (CPOM-FSD and FSDv2-WAVE) show the opposite pattern. These differences between models and the observations may be attributed to limitations in the observations (e.g. the image resolution is not sufficient to detect small floes) or limitations in the model parameterisations, including the use of a global power-law exponent in the WIPoFSD model as well as too weak a floe welding and enhanced wave fracture in the prognostic models. |
format |
Text |
author |
Wang, Yanan Hwang, Byongjun Bateson, Adam William Aksenov, Yevgeny Horvat, Christopher |
spellingShingle |
Wang, Yanan Hwang, Byongjun Bateson, Adam William Aksenov, Yevgeny Horvat, Christopher Summer sea ice floe perimeter density in the Arctic: high-resolution optical satellite imagery and model evaluation |
author_facet |
Wang, Yanan Hwang, Byongjun Bateson, Adam William Aksenov, Yevgeny Horvat, Christopher |
author_sort |
Wang, Yanan |
title |
Summer sea ice floe perimeter density in the Arctic: high-resolution optical satellite imagery and model evaluation |
title_short |
Summer sea ice floe perimeter density in the Arctic: high-resolution optical satellite imagery and model evaluation |
title_full |
Summer sea ice floe perimeter density in the Arctic: high-resolution optical satellite imagery and model evaluation |
title_fullStr |
Summer sea ice floe perimeter density in the Arctic: high-resolution optical satellite imagery and model evaluation |
title_full_unstemmed |
Summer sea ice floe perimeter density in the Arctic: high-resolution optical satellite imagery and model evaluation |
title_sort |
summer sea ice floe perimeter density in the arctic: high-resolution optical satellite imagery and model evaluation |
publishDate |
2023 |
url |
https://doi.org/10.5194/tc-17-3575-2023 https://tc.copernicus.org/articles/17/3575/2023/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Sea ice |
genre_facet |
Arctic Sea ice |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-17-3575-2023 https://tc.copernicus.org/articles/17/3575/2023/ |
op_doi |
https://doi.org/10.5194/tc-17-3575-2023 |
container_title |
The Cryosphere |
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17 |
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8 |
container_start_page |
3575 |
op_container_end_page |
3591 |
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1778135518276485120 |