High-Resolution Thermal Imaging in the Antarctic Marginal Ice Zone : Skin Temperature Heterogeneity and Effects on Heat Fluxes
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 meas...
Published in: | Earth and Space Science |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Uppsala universitet, Luft-, vatten- och landskapslära
2023
|
Subjects: | |
Online Access: | http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-514361 https://doi.org/10.1029/2023EA003078 |
id |
ftuppsalauniv:oai:DiVA.org:uu-514361 |
---|---|
record_format |
openpolar |
spelling |
ftuppsalauniv:oai:DiVA.org:uu-514361 2023-11-12T04:08:06+01:00 High-Resolution Thermal Imaging in the Antarctic Marginal Ice Zone : Skin Temperature Heterogeneity and Effects on Heat Fluxes Tersigni, Ippolita Alberello, Alberto Messori, Gabriele Vichi, Marcello Onorato, Miguel Toffoli, Alessandro 2023 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-514361 https://doi.org/10.1029/2023EA003078 eng eng Uppsala universitet, Luft-, vatten- och landskapslära Univ Melbourne, Dept Infrastruct Engn, Parkville, Vic, Australia. Univ East Anglia, Sch Math, Norwich, England. Stockholm Univ, Dept Meteorol, Stockholm, Sweden.;Stockholm Univ, Bolin Ctr Climate Res, Stockholm, Sweden. Univ Cape Town, Dept Oceanog, Cape Town, South Africa.;Univ Cape Town, Marine & Antarctic Res Ctr Innovat & Sustainabil, Cape Town, South Africa. Univ Torino, Dipartimento Fis, Turin, Italy.;INFN, Sez Torino, Turin, Italy. Earth and Space Science, 2023, 10:9, orcid:0000-0002-2032-5211 orcid:0000-0002-0686-9634 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-514361 doi:10.1029/2023EA003078 ISI:001066800300001 info:eu-repo/semantics/openAccess Oceanography Hydrology and Water Resources Oceanografi hydrologi och vattenresurser Article in journal info:eu-repo/semantics/article text 2023 ftuppsalauniv https://doi.org/10.1029/2023EA003078 2023-10-25T22:31:54Z 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 Uppsala University: Publications (DiVA) Antarctic Austral Indian Southern Ocean The Antarctic Earth and Space Science 10 9 |
institution |
Open Polar |
collection |
Uppsala University: Publications (DiVA) |
op_collection_id |
ftuppsalauniv |
language |
English |
topic |
Oceanography Hydrology and Water Resources Oceanografi hydrologi och vattenresurser |
spellingShingle |
Oceanography Hydrology and Water Resources Oceanografi hydrologi och vattenresurser Tersigni, Ippolita Alberello, Alberto Messori, Gabriele Vichi, Marcello Onorato, Miguel Toffoli, Alessandro High-Resolution Thermal Imaging in the Antarctic Marginal Ice Zone : Skin Temperature Heterogeneity and Effects on Heat Fluxes |
topic_facet |
Oceanography Hydrology and Water Resources Oceanografi hydrologi och vattenresurser |
description |
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 |
Tersigni, Ippolita Alberello, Alberto Messori, Gabriele Vichi, Marcello Onorato, Miguel Toffoli, Alessandro |
author_facet |
Tersigni, Ippolita Alberello, Alberto Messori, Gabriele Vichi, Marcello Onorato, Miguel Toffoli, Alessandro |
author_sort |
Tersigni, Ippolita |
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 |
Uppsala universitet, Luft-, vatten- och landskapslära |
publishDate |
2023 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-514361 https://doi.org/10.1029/2023EA003078 |
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_relation |
Earth and Space Science, 2023, 10:9, orcid:0000-0002-2032-5211 orcid:0000-0002-0686-9634 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-514361 doi:10.1029/2023EA003078 ISI:001066800300001 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2023EA003078 |
container_title |
Earth and Space Science |
container_volume |
10 |
container_issue |
9 |
_version_ |
1782328505818677248 |