Retrieval and parameterisation of sea-ice bulk density from airborne multi-sensor measurements
Knowledge of sea-ice thickness and volume depends on freeboard observations from satellite altimeters and in turn on information of snow mass and sea-ice density required for the freeboard-to-thickness conversion. These parameters, especially sea-ice density, are usually based on climatologies const...
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ftdoajarticles:oai:doaj.org/article:0f2676cf2f8048feaff06422e85d4c9d 2023-05-15T15:00:50+02:00 Retrieval and parameterisation of sea-ice bulk density from airborne multi-sensor measurements A. Jutila S. Hendricks R. Ricker L. von Albedyll T. Krumpen C. Haas 2022-01-01T00:00:00Z https://doi.org/10.5194/tc-16-259-2022 https://doaj.org/article/0f2676cf2f8048feaff06422e85d4c9d EN eng Copernicus Publications https://tc.copernicus.org/articles/16/259/2022/tc-16-259-2022.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-16-259-2022 1994-0416 1994-0424 https://doaj.org/article/0f2676cf2f8048feaff06422e85d4c9d The Cryosphere, Vol 16, Pp 259-275 (2022) Environmental sciences GE1-350 Geology QE1-996.5 article 2022 ftdoajarticles https://doi.org/10.5194/tc-16-259-2022 2022-12-31T10:49:00Z Knowledge of sea-ice thickness and volume depends on freeboard observations from satellite altimeters and in turn on information of snow mass and sea-ice density required for the freeboard-to-thickness conversion. These parameters, especially sea-ice density, are usually based on climatologies constructed from in situ observations made in the 1980s and earlier while contemporary and representative measurements are lacking. Our aim with this paper is to derive updated sea-ice bulk density estimates suitable for the present Arctic sea-ice cover and a range of ice types to reduce uncertainties in sea-ice thickness remote sensing. Our sea-ice density measurements are based on over 3000 km of high-resolution collocated airborne sea-ice and snow thickness and freeboard measurements in the western Arctic Ocean in 2017 and 2019. Sea-ice bulk density is derived assuming isostatic equilibrium for different ice types. Our results show higher average bulk densities for both first-year ice (FYI) and especially multi-year ice (MYI) compared to previous studies. In addition, we find a small difference between deformed and possibly unconsolidated FYI and younger MYI. We find a negative-exponential relationship between sea-ice bulk density and sea-ice freeboard and apply this parameterisation to one winter of monthly gridded CryoSat-2 sea-ice freeboard data. We discuss the suitability and the impact of the derived FYI and MYI bulk densities for sea-ice thickness retrievals and the uncertainty related to the indirect method of measuring sea-ice bulk density. The results suggest that retrieval algorithms be adapted to changes in sea-ice density and highlight the need of future studies to evaluate the impact of density parameterisation on the full sea-ice thickness data record. Article in Journal/Newspaper Arctic Arctic Ocean Sea ice The Cryosphere Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean The Cryosphere 16 1 259 275 |
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 A. Jutila S. Hendricks R. Ricker L. von Albedyll T. Krumpen C. Haas Retrieval and parameterisation of sea-ice bulk density from airborne multi-sensor measurements |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
Knowledge of sea-ice thickness and volume depends on freeboard observations from satellite altimeters and in turn on information of snow mass and sea-ice density required for the freeboard-to-thickness conversion. These parameters, especially sea-ice density, are usually based on climatologies constructed from in situ observations made in the 1980s and earlier while contemporary and representative measurements are lacking. Our aim with this paper is to derive updated sea-ice bulk density estimates suitable for the present Arctic sea-ice cover and a range of ice types to reduce uncertainties in sea-ice thickness remote sensing. Our sea-ice density measurements are based on over 3000 km of high-resolution collocated airborne sea-ice and snow thickness and freeboard measurements in the western Arctic Ocean in 2017 and 2019. Sea-ice bulk density is derived assuming isostatic equilibrium for different ice types. Our results show higher average bulk densities for both first-year ice (FYI) and especially multi-year ice (MYI) compared to previous studies. In addition, we find a small difference between deformed and possibly unconsolidated FYI and younger MYI. We find a negative-exponential relationship between sea-ice bulk density and sea-ice freeboard and apply this parameterisation to one winter of monthly gridded CryoSat-2 sea-ice freeboard data. We discuss the suitability and the impact of the derived FYI and MYI bulk densities for sea-ice thickness retrievals and the uncertainty related to the indirect method of measuring sea-ice bulk density. The results suggest that retrieval algorithms be adapted to changes in sea-ice density and highlight the need of future studies to evaluate the impact of density parameterisation on the full sea-ice thickness data record. |
format |
Article in Journal/Newspaper |
author |
A. Jutila S. Hendricks R. Ricker L. von Albedyll T. Krumpen C. Haas |
author_facet |
A. Jutila S. Hendricks R. Ricker L. von Albedyll T. Krumpen C. Haas |
author_sort |
A. Jutila |
title |
Retrieval and parameterisation of sea-ice bulk density from airborne multi-sensor measurements |
title_short |
Retrieval and parameterisation of sea-ice bulk density from airborne multi-sensor measurements |
title_full |
Retrieval and parameterisation of sea-ice bulk density from airborne multi-sensor measurements |
title_fullStr |
Retrieval and parameterisation of sea-ice bulk density from airborne multi-sensor measurements |
title_full_unstemmed |
Retrieval and parameterisation of sea-ice bulk density from airborne multi-sensor measurements |
title_sort |
retrieval and parameterisation of sea-ice bulk density from airborne multi-sensor measurements |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/tc-16-259-2022 https://doaj.org/article/0f2676cf2f8048feaff06422e85d4c9d |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Sea ice The Cryosphere |
genre_facet |
Arctic Arctic Ocean Sea ice The Cryosphere |
op_source |
The Cryosphere, Vol 16, Pp 259-275 (2022) |
op_relation |
https://tc.copernicus.org/articles/16/259/2022/tc-16-259-2022.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-16-259-2022 1994-0416 1994-0424 https://doaj.org/article/0f2676cf2f8048feaff06422e85d4c9d |
op_doi |
https://doi.org/10.5194/tc-16-259-2022 |
container_title |
The Cryosphere |
container_volume |
16 |
container_issue |
1 |
container_start_page |
259 |
op_container_end_page |
275 |
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