High‐Resolution Thermal Imaging in the Antarctic Marginal Ice Zone: Skin Temperature Heterogeneity and Effects on Heat Fluxes
Abstract Insufficient in situ observations from the Antarctic marginal ice zone (MIZ) limit our understanding and description of relevant mechanical and thermodynamic processes that regulate the seasonal sea ice cycle. Here we present high‐resolution thermal images of the ocean surface and complemen...
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American Geophysical Union (AGU)
2023
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ftdoajarticles:oai:doaj.org/article:7e47c579b30b49e2a68913ef8fd18a56 2023-11-12T04:08:26+01:00 High‐Resolution Thermal Imaging in the Antarctic Marginal Ice Zone: Skin Temperature Heterogeneity and Effects on Heat Fluxes Ippolita Tersigni Alberto Alberello Gabriele Messori Marcello Vichi Miguel Onorato Alessandro Toffoli 2023-09-01T00:00:00Z https://doi.org/10.1029/2023EA003078 https://doaj.org/article/7e47c579b30b49e2a68913ef8fd18a56 EN eng American Geophysical Union (AGU) https://doi.org/10.1029/2023EA003078 https://doaj.org/toc/2333-5084 2333-5084 doi:10.1029/2023EA003078 https://doaj.org/article/7e47c579b30b49e2a68913ef8fd18a56 Earth and Space Science, Vol 10, Iss 9, Pp n/a-n/a (2023) Astronomy QB1-991 Geology QE1-996.5 article 2023 ftdoajarticles https://doi.org/10.1029/2023EA003078 2023-10-22T00:41:39Z Abstract Insufficient in situ observations from the Antarctic marginal ice zone (MIZ) limit our understanding and description of relevant mechanical and thermodynamic processes that regulate the seasonal sea ice cycle. Here we present high‐resolution thermal images of the ocean surface and complementary measurements of atmospheric variables that were acquired underway during one austral winter and one austral spring expedition in the Atlantic and Indian sectors of the Southern Ocean. Skin temperature data and ice cover images were used to estimate the partitioning of the heterogeneous surface and calculate the heat fluxes to compare with ERA5 reanalyses. The winter MIZ was composed of different but relatively regularly distributed sea ice types with sharp thermal gradients. The surface‐weighted skin temperature compared well with the reanalyses due to a compensation of errors between the sea ice fraction and the ice floe temperature. These uncertainties determine the dominant source of inaccuracy for heat fluxes as computed from observed variables. In spring, the sea ice type distribution was more irregular, with alternation of sea ice cover and large open water fractions even 400 km from the ice edge. The skin temperature distribution was more homogeneous and did not produce substantial uncertainties in heat fluxes. The discrepancies relative to reanalysis data are however larger than in winter and are attributed to biases in the atmospheric variables, with the downward solar radiation being the most critical. Article in Journal/Newspaper Antarc* Antarctic Sea ice Southern Ocean Directory of Open Access Journals: DOAJ Articles Antarctic Austral Indian Southern Ocean The Antarctic Earth and Space Science 10 9 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Astronomy QB1-991 Geology QE1-996.5 |
spellingShingle |
Astronomy QB1-991 Geology QE1-996.5 Ippolita Tersigni Alberto Alberello Gabriele Messori Marcello Vichi Miguel Onorato Alessandro Toffoli High‐Resolution Thermal Imaging in the Antarctic Marginal Ice Zone: Skin Temperature Heterogeneity and Effects on Heat Fluxes |
topic_facet |
Astronomy QB1-991 Geology QE1-996.5 |
description |
Abstract Insufficient in situ observations from the Antarctic marginal ice zone (MIZ) limit our understanding and description of relevant mechanical and thermodynamic processes that regulate the seasonal sea ice cycle. Here we present high‐resolution thermal images of the ocean surface and complementary measurements of atmospheric variables that were acquired underway during one austral winter and one austral spring expedition in the Atlantic and Indian sectors of the Southern Ocean. Skin temperature data and ice cover images were used to estimate the partitioning of the heterogeneous surface and calculate the heat fluxes to compare with ERA5 reanalyses. The winter MIZ was composed of different but relatively regularly distributed sea ice types with sharp thermal gradients. The surface‐weighted skin temperature compared well with the reanalyses due to a compensation of errors between the sea ice fraction and the ice floe temperature. These uncertainties determine the dominant source of inaccuracy for heat fluxes as computed from observed variables. In spring, the sea ice type distribution was more irregular, with alternation of sea ice cover and large open water fractions even 400 km from the ice edge. The skin temperature distribution was more homogeneous and did not produce substantial uncertainties in heat fluxes. The discrepancies relative to reanalysis data are however larger than in winter and are attributed to biases in the atmospheric variables, with the downward solar radiation being the most critical. |
format |
Article in Journal/Newspaper |
author |
Ippolita Tersigni Alberto Alberello Gabriele Messori Marcello Vichi Miguel Onorato Alessandro Toffoli |
author_facet |
Ippolita Tersigni Alberto Alberello Gabriele Messori Marcello Vichi Miguel Onorato Alessandro Toffoli |
author_sort |
Ippolita Tersigni |
title |
High‐Resolution Thermal Imaging in the Antarctic Marginal Ice Zone: Skin Temperature Heterogeneity and Effects on Heat Fluxes |
title_short |
High‐Resolution Thermal Imaging in the Antarctic Marginal Ice Zone: Skin Temperature Heterogeneity and Effects on Heat Fluxes |
title_full |
High‐Resolution Thermal Imaging in the Antarctic Marginal Ice Zone: Skin Temperature Heterogeneity and Effects on Heat Fluxes |
title_fullStr |
High‐Resolution Thermal Imaging in the Antarctic Marginal Ice Zone: Skin Temperature Heterogeneity and Effects on Heat Fluxes |
title_full_unstemmed |
High‐Resolution Thermal Imaging in the Antarctic Marginal Ice Zone: Skin Temperature Heterogeneity and Effects on Heat Fluxes |
title_sort |
high‐resolution thermal imaging in the antarctic marginal ice zone: skin temperature heterogeneity and effects on heat fluxes |
publisher |
American Geophysical Union (AGU) |
publishDate |
2023 |
url |
https://doi.org/10.1029/2023EA003078 https://doaj.org/article/7e47c579b30b49e2a68913ef8fd18a56 |
geographic |
Antarctic Austral Indian Southern Ocean The Antarctic |
geographic_facet |
Antarctic Austral Indian Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean |
op_source |
Earth and Space Science, Vol 10, Iss 9, Pp n/a-n/a (2023) |
op_relation |
https://doi.org/10.1029/2023EA003078 https://doaj.org/toc/2333-5084 2333-5084 doi:10.1029/2023EA003078 https://doaj.org/article/7e47c579b30b49e2a68913ef8fd18a56 |
op_doi |
https://doi.org/10.1029/2023EA003078 |
container_title |
Earth and Space Science |
container_volume |
10 |
container_issue |
9 |
_version_ |
1782328730861961216 |