Empirical parametrization of Envisat freeboard retrieval of Arctic and Antarctic sea ice based on CryoSat-2: progress in the ESA Climate Change Initiative
In order to derive long-term changes in sea-ice volume, a multi-decadal sea-ice thickness record is required. CryoSat-2 has showcased the potential of radar altimetry for sea-ice mass-balance estimation over the recent years. However, precursor altimetry missions such as Environmental Satellite (Env...
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ftawi:oai:epic.awi.de:48619 2023-05-15T13:45:21+02:00 Empirical parametrization of Envisat freeboard retrieval of Arctic and Antarctic sea ice based on CryoSat-2: progress in the ESA Climate Change Initiative Paul, Stephan Hendricks, Stefan Ricker, Robert Kern, Stefan Rinne, Eero 2018-07 application/pdf https://epic.awi.de/id/eprint/48619/ https://epic.awi.de/id/eprint/48619/1/tc-12-2437-2018-3.pdf https://doi.org/10.5194/tc-12-2437-2018 https://hdl.handle.net/10013/epic.65a58ad0-24f6-4dae-b4d9-9eeed4ef3bcf https://hdl.handle.net/ unknown https://epic.awi.de/id/eprint/48619/1/tc-12-2437-2018-3.pdf https://hdl.handle.net/ Paul, S. orcid:0000-0002-5136-714X , Hendricks, S. orcid:0000-0002-1412-3146 , Ricker, R. orcid:0000-0001-6928-7757 , Kern, S. and Rinne, E. (2018) Empirical parametrization of Envisat freeboard retrieval of Arctic and Antarctic sea ice based on CryoSat-2: progress in the ESA Climate Change Initiative , The Cryosphere, 12 (7), pp. 2437-2460 . doi:10.5194/tc-12-2437-2018 <https://doi.org/10.5194/tc-12-2437-2018> , hdl:10013/epic.65a58ad0-24f6-4dae-b4d9-9eeed4ef3bcf EPIC3The Cryosphere, 12(7), pp. 2437-2460, ISSN: 1994-0424 Article isiRev 2018 ftawi https://doi.org/10.5194/tc-12-2437-2018 2021-12-24T15:44:22Z In order to derive long-term changes in sea-ice volume, a multi-decadal sea-ice thickness record is required. CryoSat-2 has showcased the potential of radar altimetry for sea-ice mass-balance estimation over the recent years. However, precursor altimetry missions such as Environmental Satellite (Envisat) have not been exploited to the same extent so far. Combining both missions to acquire a decadal sea-ice volume data set requires a method to overcome the discrepancies due to different footprint sizes from either pulse-limited or beam-sharpened radar echoes. In this study, we implemented an inter-mission-consistent surface-type classification scheme for both hemispheres, based on the waveform pulse peakiness, leading-edge width, and surface backscatter. In order to achieve a consistent retracking procedure, we adapted the threshold first-maximum retracker algorithm, previously used only for CryoSat-2, to develop an adaptive retracker threshold that depends on waveform characteristics. With our method, we produce a global and consistent freeboard data set for CryoSat-2 and Envisat. This novel data set features a maximum monthly difference in the mission-overlap period of 2.2cm (2.7cm) for the Arctic (Antarctic) based on all gridded values with spatial resolution of 25 km × 25 km and 50 km × 50 km for the Arctic and Antarctic, respectively. Article in Journal/Newspaper Antarc* Antarctic Arctic Arctic Climate change Sea ice The Cryosphere Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Arctic The Cryosphere 12 7 2437 2460 |
institution |
Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
In order to derive long-term changes in sea-ice volume, a multi-decadal sea-ice thickness record is required. CryoSat-2 has showcased the potential of radar altimetry for sea-ice mass-balance estimation over the recent years. However, precursor altimetry missions such as Environmental Satellite (Envisat) have not been exploited to the same extent so far. Combining both missions to acquire a decadal sea-ice volume data set requires a method to overcome the discrepancies due to different footprint sizes from either pulse-limited or beam-sharpened radar echoes. In this study, we implemented an inter-mission-consistent surface-type classification scheme for both hemispheres, based on the waveform pulse peakiness, leading-edge width, and surface backscatter. In order to achieve a consistent retracking procedure, we adapted the threshold first-maximum retracker algorithm, previously used only for CryoSat-2, to develop an adaptive retracker threshold that depends on waveform characteristics. With our method, we produce a global and consistent freeboard data set for CryoSat-2 and Envisat. This novel data set features a maximum monthly difference in the mission-overlap period of 2.2cm (2.7cm) for the Arctic (Antarctic) based on all gridded values with spatial resolution of 25 km × 25 km and 50 km × 50 km for the Arctic and Antarctic, respectively. |
format |
Article in Journal/Newspaper |
author |
Paul, Stephan Hendricks, Stefan Ricker, Robert Kern, Stefan Rinne, Eero |
spellingShingle |
Paul, Stephan Hendricks, Stefan Ricker, Robert Kern, Stefan Rinne, Eero Empirical parametrization of Envisat freeboard retrieval of Arctic and Antarctic sea ice based on CryoSat-2: progress in the ESA Climate Change Initiative |
author_facet |
Paul, Stephan Hendricks, Stefan Ricker, Robert Kern, Stefan Rinne, Eero |
author_sort |
Paul, Stephan |
title |
Empirical parametrization of Envisat freeboard retrieval of Arctic and Antarctic sea ice based on CryoSat-2: progress in the ESA Climate Change Initiative |
title_short |
Empirical parametrization of Envisat freeboard retrieval of Arctic and Antarctic sea ice based on CryoSat-2: progress in the ESA Climate Change Initiative |
title_full |
Empirical parametrization of Envisat freeboard retrieval of Arctic and Antarctic sea ice based on CryoSat-2: progress in the ESA Climate Change Initiative |
title_fullStr |
Empirical parametrization of Envisat freeboard retrieval of Arctic and Antarctic sea ice based on CryoSat-2: progress in the ESA Climate Change Initiative |
title_full_unstemmed |
Empirical parametrization of Envisat freeboard retrieval of Arctic and Antarctic sea ice based on CryoSat-2: progress in the ESA Climate Change Initiative |
title_sort |
empirical parametrization of envisat freeboard retrieval of arctic and antarctic sea ice based on cryosat-2: progress in the esa climate change initiative |
publishDate |
2018 |
url |
https://epic.awi.de/id/eprint/48619/ https://epic.awi.de/id/eprint/48619/1/tc-12-2437-2018-3.pdf https://doi.org/10.5194/tc-12-2437-2018 https://hdl.handle.net/10013/epic.65a58ad0-24f6-4dae-b4d9-9eeed4ef3bcf https://hdl.handle.net/ |
geographic |
Antarctic Arctic |
geographic_facet |
Antarctic Arctic |
genre |
Antarc* Antarctic Arctic Arctic Climate change Sea ice The Cryosphere |
genre_facet |
Antarc* Antarctic Arctic Arctic Climate change Sea ice The Cryosphere |
op_source |
EPIC3The Cryosphere, 12(7), pp. 2437-2460, ISSN: 1994-0424 |
op_relation |
https://epic.awi.de/id/eprint/48619/1/tc-12-2437-2018-3.pdf https://hdl.handle.net/ Paul, S. orcid:0000-0002-5136-714X , Hendricks, S. orcid:0000-0002-1412-3146 , Ricker, R. orcid:0000-0001-6928-7757 , Kern, S. and Rinne, E. (2018) Empirical parametrization of Envisat freeboard retrieval of Arctic and Antarctic sea ice based on CryoSat-2: progress in the ESA Climate Change Initiative , The Cryosphere, 12 (7), pp. 2437-2460 . doi:10.5194/tc-12-2437-2018 <https://doi.org/10.5194/tc-12-2437-2018> , hdl:10013/epic.65a58ad0-24f6-4dae-b4d9-9eeed4ef3bcf |
op_doi |
https://doi.org/10.5194/tc-12-2437-2018 |
container_title |
The Cryosphere |
container_volume |
12 |
container_issue |
7 |
container_start_page |
2437 |
op_container_end_page |
2460 |
_version_ |
1766221422266417152 |