On the Estimation of Melt Pond Fraction on the Arctic Sea Ice With ENVISAT WSM Images
The accuracy of microwave radiometer ice concentration (IC) retrievals in the Arctic is degraded by melt ponds on sea ice during the melting season. For the development of IC retrieval algorithms and for the quantification of their uncertainties, data sets on the area fraction of melt ponds (f(mp))...
Published in: | IEEE Transactions on Geoscience and Remote Sensing |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2014
|
Subjects: | |
Online Access: | http://hdl.handle.net/11858/00-001M-0000-002D-D155-A |
id |
ftpubman:oai:pure.mpg.de:item_2473133 |
---|---|
record_format |
openpolar |
spelling |
ftpubman:oai:pure.mpg.de:item_2473133 2023-08-20T04:04:15+02:00 On the Estimation of Melt Pond Fraction on the Arctic Sea Ice With ENVISAT WSM Images Makynen, M. Kern, S. Roesel, A. Pedersen, L. 2014 http://hdl.handle.net/11858/00-001M-0000-002D-D155-A eng eng info:eu-repo/semantics/altIdentifier/doi/10.1109/TGRS.2014.2311476 http://hdl.handle.net/11858/00-001M-0000-002D-D155-A IEEE Transactions on Geoscience and Remote Sensing info:eu-repo/semantics/article 2014 ftpubman https://doi.org/10.1109/TGRS.2014.2311476 2023-08-01T23:01:58Z The accuracy of microwave radiometer ice concentration (IC) retrievals in the Arctic is degraded by melt ponds on sea ice during the melting season. For the development of IC retrieval algorithms and for the quantification of their uncertainties, data sets on the area fraction of melt ponds (f(mp)) are needed. f(mp) retrieval with optical satellite data is limited by clouds. Thus, we have studied f(mp) retrieval with ENVISAT wide swath mode (WSM) synthetic aperture radar (SAR) images which have large daily coverage over the Arctic Sea ice in 2007-2012. The WSM images used here were acquired north of the Fram Strait in June-August 2009. Data on f(mp) were available from the Integrated Climate Data Center's daily Moderate Resolution Imaging Spectroradiometer (MODIS) f(mp) product in a 12.5-km grid. Relationships between SAR sigma degrees and MODIS f(mp) were studied visually by comparing daily SAR mosaics and f(mp) charts and by analyzing f(mp) and sigma degrees time series and spatially and temporally coincident f(mp) and sigma degrees data. The correspondence between the changes of f(mp) and the sigma degrees statistics is too low to suggest f(mp) estimation from the WSM images. In some cases, there was a 2-3-dB sigma degrees increase during the ponding period. It is assumed that the variation of snow and sea ice characteristics diminishes sigma degrees changes due to the melt ponding and drainage. Good correlation between sigma degrees and f(mp) has only been observed for smooth landfast first-year ice in previous studies. A very interesting observation was the large temporal sigma degrees variations during the late melting season, which are likely linked to the atmospherically forced freezing-melting events. These events may also influence radiometer IC retrievals. Article in Journal/Newspaper Arctic Fram Strait Sea ice Max Planck Society: MPG.PuRe Arctic IEEE Transactions on Geoscience and Remote Sensing 52 11 7366 7379 |
institution |
Open Polar |
collection |
Max Planck Society: MPG.PuRe |
op_collection_id |
ftpubman |
language |
English |
description |
The accuracy of microwave radiometer ice concentration (IC) retrievals in the Arctic is degraded by melt ponds on sea ice during the melting season. For the development of IC retrieval algorithms and for the quantification of their uncertainties, data sets on the area fraction of melt ponds (f(mp)) are needed. f(mp) retrieval with optical satellite data is limited by clouds. Thus, we have studied f(mp) retrieval with ENVISAT wide swath mode (WSM) synthetic aperture radar (SAR) images which have large daily coverage over the Arctic Sea ice in 2007-2012. The WSM images used here were acquired north of the Fram Strait in June-August 2009. Data on f(mp) were available from the Integrated Climate Data Center's daily Moderate Resolution Imaging Spectroradiometer (MODIS) f(mp) product in a 12.5-km grid. Relationships between SAR sigma degrees and MODIS f(mp) were studied visually by comparing daily SAR mosaics and f(mp) charts and by analyzing f(mp) and sigma degrees time series and spatially and temporally coincident f(mp) and sigma degrees data. The correspondence between the changes of f(mp) and the sigma degrees statistics is too low to suggest f(mp) estimation from the WSM images. In some cases, there was a 2-3-dB sigma degrees increase during the ponding period. It is assumed that the variation of snow and sea ice characteristics diminishes sigma degrees changes due to the melt ponding and drainage. Good correlation between sigma degrees and f(mp) has only been observed for smooth landfast first-year ice in previous studies. A very interesting observation was the large temporal sigma degrees variations during the late melting season, which are likely linked to the atmospherically forced freezing-melting events. These events may also influence radiometer IC retrievals. |
format |
Article in Journal/Newspaper |
author |
Makynen, M. Kern, S. Roesel, A. Pedersen, L. |
spellingShingle |
Makynen, M. Kern, S. Roesel, A. Pedersen, L. On the Estimation of Melt Pond Fraction on the Arctic Sea Ice With ENVISAT WSM Images |
author_facet |
Makynen, M. Kern, S. Roesel, A. Pedersen, L. |
author_sort |
Makynen, M. |
title |
On the Estimation of Melt Pond Fraction on the Arctic Sea Ice With ENVISAT WSM Images |
title_short |
On the Estimation of Melt Pond Fraction on the Arctic Sea Ice With ENVISAT WSM Images |
title_full |
On the Estimation of Melt Pond Fraction on the Arctic Sea Ice With ENVISAT WSM Images |
title_fullStr |
On the Estimation of Melt Pond Fraction on the Arctic Sea Ice With ENVISAT WSM Images |
title_full_unstemmed |
On the Estimation of Melt Pond Fraction on the Arctic Sea Ice With ENVISAT WSM Images |
title_sort |
on the estimation of melt pond fraction on the arctic sea ice with envisat wsm images |
publishDate |
2014 |
url |
http://hdl.handle.net/11858/00-001M-0000-002D-D155-A |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Fram Strait Sea ice |
genre_facet |
Arctic Fram Strait Sea ice |
op_source |
IEEE Transactions on Geoscience and Remote Sensing |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1109/TGRS.2014.2311476 http://hdl.handle.net/11858/00-001M-0000-002D-D155-A |
op_doi |
https://doi.org/10.1109/TGRS.2014.2311476 |
container_title |
IEEE Transactions on Geoscience and Remote Sensing |
container_volume |
52 |
container_issue |
11 |
container_start_page |
7366 |
op_container_end_page |
7379 |
_version_ |
1774714646685548544 |