Aspects of intraseasonal variability of Antarctic sea ice in austral winter related to ENSO and SAM events
ABSTRACT We performed an Empirical Orthogonal Function (EOF) analysis to assess the intraseasonal variability of 5–60 day band-pass filtered Antarctic sea-ice concentration in austral winter using a 20-year daily dataset from 1995 to 2014. Zonal wave number 3 dominated in the Antarctic, especially s...
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crcambridgeupr:10.1017/jog.2017.49 2024-03-03T08:37:54+00:00 Aspects of intraseasonal variability of Antarctic sea ice in austral winter related to ENSO and SAM events BABA, KENJI RENWICK, JAMES 2017 http://dx.doi.org/10.1017/jog.2017.49 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143017000491 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Journal of Glaciology volume 63, issue 241, page 838-846 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 2017 crcambridgeupr https://doi.org/10.1017/jog.2017.49 2024-02-08T08:43:51Z ABSTRACT We performed an Empirical Orthogonal Function (EOF) analysis to assess the intraseasonal variability of 5–60 day band-pass filtered Antarctic sea-ice concentration in austral winter using a 20-year daily dataset from 1995 to 2014. Zonal wave number 3 dominated in the Antarctic, especially so across the west Antarctic. Results showed the coexistence of stationary and propagating wave components. A spectral analysis of the first two principal components (PCs) showed a similar structure for periods up to 15 days but generally more power in PC1 at longer periods. Regression analysis upon atmospheric fields using the first two PCs of sea-ice concentration showed a coherent wave number 3 pattern. The spatial phase delay between the sea-ice and mean sea-level pressure patterns suggests that meridional flow and associated temperature advection are important for modulating the sea-ice field. EOF analyses carried out separately for El Niño, La Niña and neutral years, and for Southern Annular Mode positive, negative and neutral periods, suggest that the spatial patterns of wave number 3 shift between subsets. The results also indicate that El Niño-Southern Oscillation and Southern Annular Mode affect stationary wave interactions between sea-ice and atmospheric fields on intraseasonal timescales. Article in Journal/Newspaper Antarc* Antarctic Journal of Glaciology Sea ice Cambridge University Press Antarctic The Antarctic Austral Journal of Glaciology 63 241 838 846 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes BABA, KENJI RENWICK, JAMES Aspects of intraseasonal variability of Antarctic sea ice in austral winter related to ENSO and SAM events |
topic_facet |
Earth-Surface Processes |
description |
ABSTRACT We performed an Empirical Orthogonal Function (EOF) analysis to assess the intraseasonal variability of 5–60 day band-pass filtered Antarctic sea-ice concentration in austral winter using a 20-year daily dataset from 1995 to 2014. Zonal wave number 3 dominated in the Antarctic, especially so across the west Antarctic. Results showed the coexistence of stationary and propagating wave components. A spectral analysis of the first two principal components (PCs) showed a similar structure for periods up to 15 days but generally more power in PC1 at longer periods. Regression analysis upon atmospheric fields using the first two PCs of sea-ice concentration showed a coherent wave number 3 pattern. The spatial phase delay between the sea-ice and mean sea-level pressure patterns suggests that meridional flow and associated temperature advection are important for modulating the sea-ice field. EOF analyses carried out separately for El Niño, La Niña and neutral years, and for Southern Annular Mode positive, negative and neutral periods, suggest that the spatial patterns of wave number 3 shift between subsets. The results also indicate that El Niño-Southern Oscillation and Southern Annular Mode affect stationary wave interactions between sea-ice and atmospheric fields on intraseasonal timescales. |
format |
Article in Journal/Newspaper |
author |
BABA, KENJI RENWICK, JAMES |
author_facet |
BABA, KENJI RENWICK, JAMES |
author_sort |
BABA, KENJI |
title |
Aspects of intraseasonal variability of Antarctic sea ice in austral winter related to ENSO and SAM events |
title_short |
Aspects of intraseasonal variability of Antarctic sea ice in austral winter related to ENSO and SAM events |
title_full |
Aspects of intraseasonal variability of Antarctic sea ice in austral winter related to ENSO and SAM events |
title_fullStr |
Aspects of intraseasonal variability of Antarctic sea ice in austral winter related to ENSO and SAM events |
title_full_unstemmed |
Aspects of intraseasonal variability of Antarctic sea ice in austral winter related to ENSO and SAM events |
title_sort |
aspects of intraseasonal variability of antarctic sea ice in austral winter related to enso and sam events |
publisher |
Cambridge University Press (CUP) |
publishDate |
2017 |
url |
http://dx.doi.org/10.1017/jog.2017.49 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143017000491 |
geographic |
Antarctic The Antarctic Austral |
geographic_facet |
Antarctic The Antarctic Austral |
genre |
Antarc* Antarctic Journal of Glaciology Sea ice |
genre_facet |
Antarc* Antarctic Journal of Glaciology Sea ice |
op_source |
Journal of Glaciology volume 63, issue 241, page 838-846 ISSN 0022-1430 1727-5652 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2017.49 |
container_title |
Journal of Glaciology |
container_volume |
63 |
container_issue |
241 |
container_start_page |
838 |
op_container_end_page |
846 |
_version_ |
1792502647075373056 |