Impact of Sea Ice Drift Retrieval Errors, Discretization and Grid Type on Calculations of Ice Deformation
We studied two issues to be considered in the calculation of parameters characterizing sea ice deformation: the effect of uncertainties in an automatically retrieved sea ice drift field, and the influence of the type of drift vector grid. Sea ice deformation changes the local ice mass balance and th...
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ftdoajarticles:oai:doaj.org/article:885a19f625394415b7bbd4267a6fdf4f 2023-05-15T18:16:55+02:00 Impact of Sea Ice Drift Retrieval Errors, Discretization and Grid Type on Calculations of Ice Deformation Jakob Griebel Wolfgang Dierking 2018-03-01T00:00:00Z https://doi.org/10.3390/rs10030393 https://doaj.org/article/885a19f625394415b7bbd4267a6fdf4f EN eng MDPI AG http://www.mdpi.com/2072-4292/10/3/393 https://doaj.org/toc/2072-4292 2072-4292 doi:10.3390/rs10030393 https://doaj.org/article/885a19f625394415b7bbd4267a6fdf4f Remote Sensing, Vol 10, Iss 3, p 393 (2018) sea ice deformation drift SAR uncertainties error analysis Science Q article 2018 ftdoajarticles https://doi.org/10.3390/rs10030393 2022-12-31T11:26:38Z We studied two issues to be considered in the calculation of parameters characterizing sea ice deformation: the effect of uncertainties in an automatically retrieved sea ice drift field, and the influence of the type of drift vector grid. Sea ice deformation changes the local ice mass balance and the interaction between atmosphere, ice, and ocean, and constitutes a hazard to marine traffic and operations. Due to numerical effects, the results of deformation retrievals may predict, e.g., openings and closings of the ice cover that do not exist in reality. We focus specifically on fields of ice drift obtained from synthetic aperture radar (SAR) imagery and analyze the Propagated Drift Retrieval Error (PDRE) and the Boundary Definition Error (BDE). From the theory of error propagation, the PDRE for the calculated deformation parameters can be estimated. To quantify the BDE, we devise five different grid types and compare theoretical expectation and numerical results for different deformation parameters assuming three scenarios: pure divergence, pure shear, and a mixture of both. Our findings for both sources of error help to set up optimal deformation retrieval schemes and are also useful for other applications working with vector fields and scalar parameters derived therefrom. Article in Journal/Newspaper Sea ice Directory of Open Access Journals: DOAJ Articles Remote Sensing 10 3 393 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
sea ice deformation drift SAR uncertainties error analysis Science Q |
spellingShingle |
sea ice deformation drift SAR uncertainties error analysis Science Q Jakob Griebel Wolfgang Dierking Impact of Sea Ice Drift Retrieval Errors, Discretization and Grid Type on Calculations of Ice Deformation |
topic_facet |
sea ice deformation drift SAR uncertainties error analysis Science Q |
description |
We studied two issues to be considered in the calculation of parameters characterizing sea ice deformation: the effect of uncertainties in an automatically retrieved sea ice drift field, and the influence of the type of drift vector grid. Sea ice deformation changes the local ice mass balance and the interaction between atmosphere, ice, and ocean, and constitutes a hazard to marine traffic and operations. Due to numerical effects, the results of deformation retrievals may predict, e.g., openings and closings of the ice cover that do not exist in reality. We focus specifically on fields of ice drift obtained from synthetic aperture radar (SAR) imagery and analyze the Propagated Drift Retrieval Error (PDRE) and the Boundary Definition Error (BDE). From the theory of error propagation, the PDRE for the calculated deformation parameters can be estimated. To quantify the BDE, we devise five different grid types and compare theoretical expectation and numerical results for different deformation parameters assuming three scenarios: pure divergence, pure shear, and a mixture of both. Our findings for both sources of error help to set up optimal deformation retrieval schemes and are also useful for other applications working with vector fields and scalar parameters derived therefrom. |
format |
Article in Journal/Newspaper |
author |
Jakob Griebel Wolfgang Dierking |
author_facet |
Jakob Griebel Wolfgang Dierking |
author_sort |
Jakob Griebel |
title |
Impact of Sea Ice Drift Retrieval Errors, Discretization and Grid Type on Calculations of Ice Deformation |
title_short |
Impact of Sea Ice Drift Retrieval Errors, Discretization and Grid Type on Calculations of Ice Deformation |
title_full |
Impact of Sea Ice Drift Retrieval Errors, Discretization and Grid Type on Calculations of Ice Deformation |
title_fullStr |
Impact of Sea Ice Drift Retrieval Errors, Discretization and Grid Type on Calculations of Ice Deformation |
title_full_unstemmed |
Impact of Sea Ice Drift Retrieval Errors, Discretization and Grid Type on Calculations of Ice Deformation |
title_sort |
impact of sea ice drift retrieval errors, discretization and grid type on calculations of ice deformation |
publisher |
MDPI AG |
publishDate |
2018 |
url |
https://doi.org/10.3390/rs10030393 https://doaj.org/article/885a19f625394415b7bbd4267a6fdf4f |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
Remote Sensing, Vol 10, Iss 3, p 393 (2018) |
op_relation |
http://www.mdpi.com/2072-4292/10/3/393 https://doaj.org/toc/2072-4292 2072-4292 doi:10.3390/rs10030393 https://doaj.org/article/885a19f625394415b7bbd4267a6fdf4f |
op_doi |
https://doi.org/10.3390/rs10030393 |
container_title |
Remote Sensing |
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10 |
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3 |
container_start_page |
393 |
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1766190893919895552 |