Satellite passive microwave sea-ice concentration data set intercomparison: closed ice and ship-based observations
We report on results of a systematic inter-comparison of 10 global sea-ice concentration (SIC) data products at 12.5 to 50.0 km grid resolution for both the Arctic and the Antarctic. The products are compared with each other with respect to differences in SIC, sea-ice area (SIA), and sea-ice extent...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00049745 2023-05-15T13:54:47+02:00 Satellite passive microwave sea-ice concentration data set intercomparison: closed ice and ship-based observations Kern, Stefan Lavergne, Thomas Notz, Dirk Pedersen, Leif Toudal Tonboe, Rasmus Tage Saldo, Roberto Sørensen, Atle MacDonald 2019-12 electronic https://doi.org/10.5194/tc-13-3261-2019 https://noa.gwlb.de/receive/cop_mods_00049745 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00049364/tc-13-3261-2019.pdf https://tc.copernicus.org/articles/13/3261/2019/tc-13-3261-2019.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-13-3261-2019 https://noa.gwlb.de/receive/cop_mods_00049745 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00049364/tc-13-3261-2019.pdf https://tc.copernicus.org/articles/13/3261/2019/tc-13-3261-2019.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2019 ftnonlinearchiv https://doi.org/10.5194/tc-13-3261-2019 2022-02-08T22:37:10Z We report on results of a systematic inter-comparison of 10 global sea-ice concentration (SIC) data products at 12.5 to 50.0 km grid resolution for both the Arctic and the Antarctic. The products are compared with each other with respect to differences in SIC, sea-ice area (SIA), and sea-ice extent (SIE), and they are compared against a global wintertime near-100 % reference SIC data set for closed pack ice conditions and against global year-round ship-based visual observations of the sea-ice cover. We can group the products based on the concept of their SIC retrieval algorithms. Group I consists of data sets using the self-optimizing EUMETSAT OSI SAF and ESA CCI algorithms. Group II includes data using the Comiso bootstrap algorithm and the NOAA NSIDC sea-ice concentration climate data record (CDR). The standard NASA Team and the ARTIST Sea Ice (ASI) algorithms are put into group III, and NASA Team 2 is the only element of group IV. The three CDRs of group I (SICCI-25km, SICCI-50km, and OSI-450) are biased low compared to a 100 % reference SIC data set with biases of −0.4 % to −1.0 % (Arctic) and −0.3 % to −1.1 % (Antarctic). Products of group II appear to be mostly biased high in the Arctic by between +1.0 % and +3.5 %, while their biases in the Antarctic range from −0.2 % to +0.9 %. Group III product biases are different for the Arctic, +0.9 % (NASA Team) and −3.7 % (ASI), but similar for the Antarctic, −5.4 % and −5.6 %, respectively. The standard deviation is smaller in the Arctic for the quoted group I products (1.9 % to 2.9 %) and Antarctic (2.5 % to 3.1 %) than for group II and III products: 3.6 % to 5.0 % for the Arctic and 4.0 % to 6.5 % for the Antarctic. We refer to the paper to understand why we could not give values for group IV here. We discuss the impact of truncating the SIC distribution, as naturally retrieved by the algorithms around the 100 % sea-ice concentration end. We show that evaluation studies of such truncated SIC products can result in misleading statistics and favour data sets that systematically overestimate SIC. We describe a method to reconstruct the non-truncated distribution of SIC before the evaluation is performed. On the basis of this evaluation, we open a discussion about the overestimation of SIC in data products, with far-reaching consequences for surface heat flux estimations in winter. We also document inconsistencies in the behaviour of the weather filters used in products of group II, and we suggest advancing studies about the influence of these weather filters on SIA and SIE time series and their trends. Article in Journal/Newspaper Antarc* Antarctic Arctic Sea ice The Cryosphere Niedersächsisches Online-Archiv NOA Arctic Antarctic The Antarctic The Cryosphere 13 12 3261 3307 |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
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English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Kern, Stefan Lavergne, Thomas Notz, Dirk Pedersen, Leif Toudal Tonboe, Rasmus Tage Saldo, Roberto Sørensen, Atle MacDonald Satellite passive microwave sea-ice concentration data set intercomparison: closed ice and ship-based observations |
topic_facet |
article Verlagsveröffentlichung |
description |
We report on results of a systematic inter-comparison of 10 global sea-ice concentration (SIC) data products at 12.5 to 50.0 km grid resolution for both the Arctic and the Antarctic. The products are compared with each other with respect to differences in SIC, sea-ice area (SIA), and sea-ice extent (SIE), and they are compared against a global wintertime near-100 % reference SIC data set for closed pack ice conditions and against global year-round ship-based visual observations of the sea-ice cover. We can group the products based on the concept of their SIC retrieval algorithms. Group I consists of data sets using the self-optimizing EUMETSAT OSI SAF and ESA CCI algorithms. Group II includes data using the Comiso bootstrap algorithm and the NOAA NSIDC sea-ice concentration climate data record (CDR). The standard NASA Team and the ARTIST Sea Ice (ASI) algorithms are put into group III, and NASA Team 2 is the only element of group IV. The three CDRs of group I (SICCI-25km, SICCI-50km, and OSI-450) are biased low compared to a 100 % reference SIC data set with biases of −0.4 % to −1.0 % (Arctic) and −0.3 % to −1.1 % (Antarctic). Products of group II appear to be mostly biased high in the Arctic by between +1.0 % and +3.5 %, while their biases in the Antarctic range from −0.2 % to +0.9 %. Group III product biases are different for the Arctic, +0.9 % (NASA Team) and −3.7 % (ASI), but similar for the Antarctic, −5.4 % and −5.6 %, respectively. The standard deviation is smaller in the Arctic for the quoted group I products (1.9 % to 2.9 %) and Antarctic (2.5 % to 3.1 %) than for group II and III products: 3.6 % to 5.0 % for the Arctic and 4.0 % to 6.5 % for the Antarctic. We refer to the paper to understand why we could not give values for group IV here. We discuss the impact of truncating the SIC distribution, as naturally retrieved by the algorithms around the 100 % sea-ice concentration end. We show that evaluation studies of such truncated SIC products can result in misleading statistics and favour data sets that systematically overestimate SIC. We describe a method to reconstruct the non-truncated distribution of SIC before the evaluation is performed. On the basis of this evaluation, we open a discussion about the overestimation of SIC in data products, with far-reaching consequences for surface heat flux estimations in winter. We also document inconsistencies in the behaviour of the weather filters used in products of group II, and we suggest advancing studies about the influence of these weather filters on SIA and SIE time series and their trends. |
format |
Article in Journal/Newspaper |
author |
Kern, Stefan Lavergne, Thomas Notz, Dirk Pedersen, Leif Toudal Tonboe, Rasmus Tage Saldo, Roberto Sørensen, Atle MacDonald |
author_facet |
Kern, Stefan Lavergne, Thomas Notz, Dirk Pedersen, Leif Toudal Tonboe, Rasmus Tage Saldo, Roberto Sørensen, Atle MacDonald |
author_sort |
Kern, Stefan |
title |
Satellite passive microwave sea-ice concentration data set intercomparison: closed ice and ship-based observations |
title_short |
Satellite passive microwave sea-ice concentration data set intercomparison: closed ice and ship-based observations |
title_full |
Satellite passive microwave sea-ice concentration data set intercomparison: closed ice and ship-based observations |
title_fullStr |
Satellite passive microwave sea-ice concentration data set intercomparison: closed ice and ship-based observations |
title_full_unstemmed |
Satellite passive microwave sea-ice concentration data set intercomparison: closed ice and ship-based observations |
title_sort |
satellite passive microwave sea-ice concentration data set intercomparison: closed ice and ship-based observations |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/tc-13-3261-2019 https://noa.gwlb.de/receive/cop_mods_00049745 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00049364/tc-13-3261-2019.pdf https://tc.copernicus.org/articles/13/3261/2019/tc-13-3261-2019.pdf |
geographic |
Arctic Antarctic The Antarctic |
geographic_facet |
Arctic Antarctic The Antarctic |
genre |
Antarc* Antarctic Arctic Sea ice The Cryosphere |
genre_facet |
Antarc* Antarctic Arctic Sea ice The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-13-3261-2019 https://noa.gwlb.de/receive/cop_mods_00049745 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00049364/tc-13-3261-2019.pdf https://tc.copernicus.org/articles/13/3261/2019/tc-13-3261-2019.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tc-13-3261-2019 |
container_title |
The Cryosphere |
container_volume |
13 |
container_issue |
12 |
container_start_page |
3261 |
op_container_end_page |
3307 |
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1766260890714243072 |