Lead detection in Arctic sea ice from CryoSat-2: quality assessment, lead area fraction and width distribution
Leads cover only a small fraction of the Arctic sea ice but they have a dominant effect on the turbulent exchange between the ocean and the atmosphere. A supervised classification of CryoSat-2 measurements is performed by a comparison with visual MODIS scenes. For several parameters thresholds are o...
Published in: | The Cryosphere |
---|---|
Main Authors: | , |
Format: | Text |
Language: | English |
Published: |
2018
|
Subjects: | |
Online Access: | https://doi.org/10.5194/tc-9-1955-2015 https://tc.copernicus.org/articles/9/1955/2015/ |
id |
ftcopernicus:oai:publications.copernicus.org:tc29315 |
---|---|
record_format |
openpolar |
spelling |
ftcopernicus:oai:publications.copernicus.org:tc29315 2023-05-15T14:49:38+02:00 Lead detection in Arctic sea ice from CryoSat-2: quality assessment, lead area fraction and width distribution Wernecke, A. Kaleschke, L. 2018-09-27 application/pdf https://doi.org/10.5194/tc-9-1955-2015 https://tc.copernicus.org/articles/9/1955/2015/ eng eng doi:10.5194/tc-9-1955-2015 https://tc.copernicus.org/articles/9/1955/2015/ eISSN: 1994-0424 Text 2018 ftcopernicus https://doi.org/10.5194/tc-9-1955-2015 2020-07-20T16:24:26Z Leads cover only a small fraction of the Arctic sea ice but they have a dominant effect on the turbulent exchange between the ocean and the atmosphere. A supervised classification of CryoSat-2 measurements is performed by a comparison with visual MODIS scenes. For several parameters thresholds are optimized and tested in order to reproduce this prior classification. The maximum power of the waveform shows the best classification properties amongst them, including the pulse peakiness. The sea surface height is derived and its spread is clearly reduced for a classifier based on the maximum power compared to published ones. Lead area fraction estimates based on CryoSat-2 show a major fracturing event in the Beaufort Sea in 2013. The resulting Arctic-wide lead width distribution follows a power law with an exponent of 2.47 ± 0.04 for the winter seasons from 2011 to 2014, confirming and complementing a regional study based on a high-resolution SPOT image. Text Arctic Beaufort Sea Sea ice Copernicus Publications: E-Journals Arctic The Cryosphere 9 5 1955 1968 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Leads cover only a small fraction of the Arctic sea ice but they have a dominant effect on the turbulent exchange between the ocean and the atmosphere. A supervised classification of CryoSat-2 measurements is performed by a comparison with visual MODIS scenes. For several parameters thresholds are optimized and tested in order to reproduce this prior classification. The maximum power of the waveform shows the best classification properties amongst them, including the pulse peakiness. The sea surface height is derived and its spread is clearly reduced for a classifier based on the maximum power compared to published ones. Lead area fraction estimates based on CryoSat-2 show a major fracturing event in the Beaufort Sea in 2013. The resulting Arctic-wide lead width distribution follows a power law with an exponent of 2.47 ± 0.04 for the winter seasons from 2011 to 2014, confirming and complementing a regional study based on a high-resolution SPOT image. |
format |
Text |
author |
Wernecke, A. Kaleschke, L. |
spellingShingle |
Wernecke, A. Kaleschke, L. Lead detection in Arctic sea ice from CryoSat-2: quality assessment, lead area fraction and width distribution |
author_facet |
Wernecke, A. Kaleschke, L. |
author_sort |
Wernecke, A. |
title |
Lead detection in Arctic sea ice from CryoSat-2: quality assessment, lead area fraction and width distribution |
title_short |
Lead detection in Arctic sea ice from CryoSat-2: quality assessment, lead area fraction and width distribution |
title_full |
Lead detection in Arctic sea ice from CryoSat-2: quality assessment, lead area fraction and width distribution |
title_fullStr |
Lead detection in Arctic sea ice from CryoSat-2: quality assessment, lead area fraction and width distribution |
title_full_unstemmed |
Lead detection in Arctic sea ice from CryoSat-2: quality assessment, lead area fraction and width distribution |
title_sort |
lead detection in arctic sea ice from cryosat-2: quality assessment, lead area fraction and width distribution |
publishDate |
2018 |
url |
https://doi.org/10.5194/tc-9-1955-2015 https://tc.copernicus.org/articles/9/1955/2015/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Beaufort Sea Sea ice |
genre_facet |
Arctic Beaufort Sea Sea ice |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-9-1955-2015 https://tc.copernicus.org/articles/9/1955/2015/ |
op_doi |
https://doi.org/10.5194/tc-9-1955-2015 |
container_title |
The Cryosphere |
container_volume |
9 |
container_issue |
5 |
container_start_page |
1955 |
op_container_end_page |
1968 |
_version_ |
1766320715353554944 |