Seasonal sea-ice variability and its trend in the Weddell Sea sector of West Antarctica
The Weddell Sea is susceptible to the ongoing climate change and experiences a reduction in an overall increase in the sea-ice extent (SIE). The nature of sea-ice in the Weddell Sea is largely associated with its geographical setup that determines the seasonal and decadal sea-ice variability. The st...
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ftdoajarticles:oai:doaj.org/article:508a8464a1264c4aab437f85859cbdc2 2023-09-05T13:13:21+02:00 Seasonal sea-ice variability and its trend in the Weddell Sea sector of West Antarctica Avinash Kumar Juhi Yadav Rahul Mohan 2021-01-01T00:00:00Z https://doi.org/10.1088/1748-9326/abdc88 https://doaj.org/article/508a8464a1264c4aab437f85859cbdc2 EN eng IOP Publishing https://doi.org/10.1088/1748-9326/abdc88 https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/abdc88 1748-9326 https://doaj.org/article/508a8464a1264c4aab437f85859cbdc2 Environmental Research Letters, Vol 16, Iss 2, p 024046 (2021) sea-ice extent sea surface temperature net heat flux climate variability Weddell Gyre Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 article 2021 ftdoajarticles https://doi.org/10.1088/1748-9326/abdc88 2023-08-13T00:37:16Z The Weddell Sea is susceptible to the ongoing climate change and experiences a reduction in an overall increase in the sea-ice extent (SIE). The nature of sea-ice in the Weddell Sea is largely associated with its geographical setup that determines the seasonal and decadal sea-ice variability. The study analysed long-term sea ice-ocean-atmosphere variability and trends (1979–2019) based on satellite and reanalysis measurements. The result shows the expansion of yearly SIE is 2.5 ± 3.5 × 10 ^3 km ^2 yr ^−1 with a significant increase in the austral summer (12.4 ± 4.6 × 10 ^3 km ^2 yr ^−1 ), whereas a decrease in the spring SIE (−4.8 ± 5.0 × 10 ^3 km ^2 yr ^−1 ) over the last four decades. Seasonal sea-ice concentration (SIC) variations in the Weddell Sea are associated with latitudinal thermal differences and westerlies intensification, culminating in the weakening or strengthening of the Weddell Gyre. The SIC recorded significant positive trends in the western and eastern parts of the Weddell Sea during the austral summer and autumn, respectively. These changes are consistent with the prevailing wind patterns and Weddell Gyre intensification in the respective seasons. During the austral winter and spring, significant negative SIC trends (north of 65° S) were recorded due to the easterlies intensification and weakening of the Weddell Gyre. While, the significant positive trends observed along the coast are linked with the easterlies intensification and sea-ice advection. Composite analysis reveals that the SIC variability is related to the sea surface temperature (SST) during austral summer and spring, whereas SST and net heat flux both regulate the SIC in the Weddell Sea during the austral winter and autumn. The positive Southern Annular Mode is associated with an increase in sea-ice during austral summer, while sea-ice decreases during the winter in the Weddell Sea. The present study reveals a strong relationship between the sea-ice variability and ocean-atmospheric forcings, but these relationships are not ... Article in Journal/Newspaper Antarc* Antarctica Sea ice Weddell Sea West Antarctica Directory of Open Access Journals: DOAJ Articles Austral Weddell Weddell Sea West Antarctica Environmental Research Letters |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
sea-ice extent sea surface temperature net heat flux climate variability Weddell Gyre Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
spellingShingle |
sea-ice extent sea surface temperature net heat flux climate variability Weddell Gyre Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 Avinash Kumar Juhi Yadav Rahul Mohan Seasonal sea-ice variability and its trend in the Weddell Sea sector of West Antarctica |
topic_facet |
sea-ice extent sea surface temperature net heat flux climate variability Weddell Gyre Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
description |
The Weddell Sea is susceptible to the ongoing climate change and experiences a reduction in an overall increase in the sea-ice extent (SIE). The nature of sea-ice in the Weddell Sea is largely associated with its geographical setup that determines the seasonal and decadal sea-ice variability. The study analysed long-term sea ice-ocean-atmosphere variability and trends (1979–2019) based on satellite and reanalysis measurements. The result shows the expansion of yearly SIE is 2.5 ± 3.5 × 10 ^3 km ^2 yr ^−1 with a significant increase in the austral summer (12.4 ± 4.6 × 10 ^3 km ^2 yr ^−1 ), whereas a decrease in the spring SIE (−4.8 ± 5.0 × 10 ^3 km ^2 yr ^−1 ) over the last four decades. Seasonal sea-ice concentration (SIC) variations in the Weddell Sea are associated with latitudinal thermal differences and westerlies intensification, culminating in the weakening or strengthening of the Weddell Gyre. The SIC recorded significant positive trends in the western and eastern parts of the Weddell Sea during the austral summer and autumn, respectively. These changes are consistent with the prevailing wind patterns and Weddell Gyre intensification in the respective seasons. During the austral winter and spring, significant negative SIC trends (north of 65° S) were recorded due to the easterlies intensification and weakening of the Weddell Gyre. While, the significant positive trends observed along the coast are linked with the easterlies intensification and sea-ice advection. Composite analysis reveals that the SIC variability is related to the sea surface temperature (SST) during austral summer and spring, whereas SST and net heat flux both regulate the SIC in the Weddell Sea during the austral winter and autumn. The positive Southern Annular Mode is associated with an increase in sea-ice during austral summer, while sea-ice decreases during the winter in the Weddell Sea. The present study reveals a strong relationship between the sea-ice variability and ocean-atmospheric forcings, but these relationships are not ... |
format |
Article in Journal/Newspaper |
author |
Avinash Kumar Juhi Yadav Rahul Mohan |
author_facet |
Avinash Kumar Juhi Yadav Rahul Mohan |
author_sort |
Avinash Kumar |
title |
Seasonal sea-ice variability and its trend in the Weddell Sea sector of West Antarctica |
title_short |
Seasonal sea-ice variability and its trend in the Weddell Sea sector of West Antarctica |
title_full |
Seasonal sea-ice variability and its trend in the Weddell Sea sector of West Antarctica |
title_fullStr |
Seasonal sea-ice variability and its trend in the Weddell Sea sector of West Antarctica |
title_full_unstemmed |
Seasonal sea-ice variability and its trend in the Weddell Sea sector of West Antarctica |
title_sort |
seasonal sea-ice variability and its trend in the weddell sea sector of west antarctica |
publisher |
IOP Publishing |
publishDate |
2021 |
url |
https://doi.org/10.1088/1748-9326/abdc88 https://doaj.org/article/508a8464a1264c4aab437f85859cbdc2 |
geographic |
Austral Weddell Weddell Sea West Antarctica |
geographic_facet |
Austral Weddell Weddell Sea West Antarctica |
genre |
Antarc* Antarctica Sea ice Weddell Sea West Antarctica |
genre_facet |
Antarc* Antarctica Sea ice Weddell Sea West Antarctica |
op_source |
Environmental Research Letters, Vol 16, Iss 2, p 024046 (2021) |
op_relation |
https://doi.org/10.1088/1748-9326/abdc88 https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/abdc88 1748-9326 https://doaj.org/article/508a8464a1264c4aab437f85859cbdc2 |
op_doi |
https://doi.org/10.1088/1748-9326/abdc88 |
container_title |
Environmental Research Letters |
_version_ |
1776204663543037952 |