Aspects of intraseasonal variability of Antarctic sea ice in austral winter related to ENSO and SAM events
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...
Published in: | Journal of Glaciology |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press
2017
|
Subjects: | |
Online Access: | https://doi.org/10.1017/jog.2017.49 https://doaj.org/article/d90d8710a2ed49cb9cfc9ab30e7a99f6 |
id |
ftdoajarticles:oai:doaj.org/article:d90d8710a2ed49cb9cfc9ab30e7a99f6 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:d90d8710a2ed49cb9cfc9ab30e7a99f6 2023-05-15T13:47:08+02:00 Aspects of intraseasonal variability of Antarctic sea ice in austral winter related to ENSO and SAM events KENJI BABA JAMES RENWICK 2017-10-01T00:00:00Z https://doi.org/10.1017/jog.2017.49 https://doaj.org/article/d90d8710a2ed49cb9cfc9ab30e7a99f6 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143017000491/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2017.49 0022-1430 1727-5652 https://doaj.org/article/d90d8710a2ed49cb9cfc9ab30e7a99f6 Journal of Glaciology, Vol 63, Pp 838-846 (2017) atmosphere/ice/ocean interactions climate change sea ice Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2017 ftdoajarticles https://doi.org/10.1017/jog.2017.49 2023-03-12T01:30:59Z 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 Directory of Open Access Journals: DOAJ Articles Antarctic Austral The Antarctic Journal of Glaciology 63 241 838 846 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
atmosphere/ice/ocean interactions climate change sea ice Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
atmosphere/ice/ocean interactions climate change sea ice Environmental sciences GE1-350 Meteorology. Climatology QC851-999 KENJI BABA JAMES RENWICK Aspects of intraseasonal variability of Antarctic sea ice in austral winter related to ENSO and SAM events |
topic_facet |
atmosphere/ice/ocean interactions climate change sea ice Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
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 |
KENJI BABA JAMES RENWICK |
author_facet |
KENJI BABA JAMES RENWICK |
author_sort |
KENJI BABA |
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 |
publishDate |
2017 |
url |
https://doi.org/10.1017/jog.2017.49 https://doaj.org/article/d90d8710a2ed49cb9cfc9ab30e7a99f6 |
geographic |
Antarctic Austral The Antarctic |
geographic_facet |
Antarctic Austral The Antarctic |
genre |
Antarc* Antarctic Journal of Glaciology Sea ice |
genre_facet |
Antarc* Antarctic Journal of Glaciology Sea ice |
op_source |
Journal of Glaciology, Vol 63, Pp 838-846 (2017) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143017000491/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2017.49 0022-1430 1727-5652 https://doaj.org/article/d90d8710a2ed49cb9cfc9ab30e7a99f6 |
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_ |
1766246397187719168 |