Cargando…
Mechanism of sea-ice expansion in the Indian Ocean sector of Antarctica: Insights from satellite observation and model reanalysis
In the backdrop of global warming, Antarctic sea-ice variability showed an overall expansion with the regional heterogeneity of increasing and decreasing patterns. Analysis of satellite derived sea-ice extent, during 1979 to 2015, in the Indian Ocean sector of Antarctica (IOA) revealed expansion of...
Autores principales: | , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2018
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6169864/ https://www.ncbi.nlm.nih.gov/pubmed/30281612 http://dx.doi.org/10.1371/journal.pone.0203222 |
_version_ | 1783360572292595712 |
---|---|
author | Jena, Babula Kumar, Avinash Ravichandran, M. Kern, Stefan |
author_facet | Jena, Babula Kumar, Avinash Ravichandran, M. Kern, Stefan |
author_sort | Jena, Babula |
collection | PubMed |
description | In the backdrop of global warming, Antarctic sea-ice variability showed an overall expansion with the regional heterogeneity of increasing and decreasing patterns. Analysis of satellite derived sea-ice extent, during 1979 to 2015, in the Indian Ocean sector of Antarctica (IOA) revealed expansion of 2.4±1.2% decade(-1). We find strengthening of westerly wind during the austral summer (between 50°S to 62°S) facilitated northward advection of a cool and fresh layer. Also, the strong westerly wind cools the upper ocean due to net heat loss from the ocean surface. The combined effect of northward advection of cold fresh layer and net heat loss from the surface, favours sea-ice expansion in the subsequent seasons, in the IOA region, north of 62°S. However, sea-ice retreat was observed near the Kerguelen Plateau, due to upper ocean warming, and hence a non-annular pattern of sea-ice extent in the IOA was observed. |
format | Online Article Text |
id | pubmed-6169864 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-61698642018-10-19 Mechanism of sea-ice expansion in the Indian Ocean sector of Antarctica: Insights from satellite observation and model reanalysis Jena, Babula Kumar, Avinash Ravichandran, M. Kern, Stefan PLoS One Research Article In the backdrop of global warming, Antarctic sea-ice variability showed an overall expansion with the regional heterogeneity of increasing and decreasing patterns. Analysis of satellite derived sea-ice extent, during 1979 to 2015, in the Indian Ocean sector of Antarctica (IOA) revealed expansion of 2.4±1.2% decade(-1). We find strengthening of westerly wind during the austral summer (between 50°S to 62°S) facilitated northward advection of a cool and fresh layer. Also, the strong westerly wind cools the upper ocean due to net heat loss from the ocean surface. The combined effect of northward advection of cold fresh layer and net heat loss from the surface, favours sea-ice expansion in the subsequent seasons, in the IOA region, north of 62°S. However, sea-ice retreat was observed near the Kerguelen Plateau, due to upper ocean warming, and hence a non-annular pattern of sea-ice extent in the IOA was observed. Public Library of Science 2018-10-03 /pmc/articles/PMC6169864/ /pubmed/30281612 http://dx.doi.org/10.1371/journal.pone.0203222 Text en © 2018 Jena et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
spellingShingle | Research Article Jena, Babula Kumar, Avinash Ravichandran, M. Kern, Stefan Mechanism of sea-ice expansion in the Indian Ocean sector of Antarctica: Insights from satellite observation and model reanalysis |
title | Mechanism of sea-ice expansion in the Indian Ocean sector of Antarctica: Insights from satellite observation and model reanalysis |
title_full | Mechanism of sea-ice expansion in the Indian Ocean sector of Antarctica: Insights from satellite observation and model reanalysis |
title_fullStr | Mechanism of sea-ice expansion in the Indian Ocean sector of Antarctica: Insights from satellite observation and model reanalysis |
title_full_unstemmed | Mechanism of sea-ice expansion in the Indian Ocean sector of Antarctica: Insights from satellite observation and model reanalysis |
title_short | Mechanism of sea-ice expansion in the Indian Ocean sector of Antarctica: Insights from satellite observation and model reanalysis |
title_sort | mechanism of sea-ice expansion in the indian ocean sector of antarctica: insights from satellite observation and model reanalysis |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6169864/ https://www.ncbi.nlm.nih.gov/pubmed/30281612 http://dx.doi.org/10.1371/journal.pone.0203222 |
work_keys_str_mv | AT jenababula mechanismofseaiceexpansionintheindianoceansectorofantarcticainsightsfromsatelliteobservationandmodelreanalysis AT kumaravinash mechanismofseaiceexpansionintheindianoceansectorofantarcticainsightsfromsatelliteobservationandmodelreanalysis AT ravichandranm mechanismofseaiceexpansionintheindianoceansectorofantarcticainsightsfromsatelliteobservationandmodelreanalysis AT kernstefan mechanismofseaiceexpansionintheindianoceansectorofantarcticainsightsfromsatelliteobservationandmodelreanalysis |