Sea-ice cover anomalies in the Arctic Basin associated with atmospheric variability from multi-decadal trends to intermittent quasi-biennial oscillations
Arctic Ocean sea ice has been diminishing since 1970, as shown by National Snow and Ice Data Center data. In addition to decadal variability, low ice anomalies in the Pacific-Siberian region have been occurring at shorter timescales. The influence of the widely-known Northern Annular Mode (NAM) occu...
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/49571 2023-05-15T14:29:17+02:00 Sea-ice cover anomalies in the Arctic Basin associated with atmospheric variability from multi-decadal trends to intermittent quasi-biennial oscillations Ikeda, Motoyoshi http://hdl.handle.net/2115/49571 https://doi.org/10.3402/polar.v31i0.18690 eng eng Norwegian Polar Institute http://hdl.handle.net/2115/49571 Polar Research, 31: 18690 http://dx.doi.org/10.3402/polar.v31i0.18690 http://creativecommons.org/licenses/by-nc/3.0/ CC-BY-NC Sea ice sea-level pressure Arctic interannual variability EOF analysis 452 article fthokunivhus https://doi.org/10.3402/polar.v31i0.18690 2022-11-18T01:02:25Z Arctic Ocean sea ice has been diminishing since 1970, as shown by National Snow and Ice Data Center data. In addition to decadal variability, low ice anomalies in the Pacific-Siberian region have been occurring at shorter timescales. The influence of the widely-known Northern Annular Mode (NAM) occurs across all seasons. In this study, empirical orthogonal function (EOF) analysis was applied to sea-level pressure in National Centers for Environmental Prediction Reanalysis data for 1960-2007, showing the NAM to be the leading mode of variability and the Arctic Dipole Mode (ADM) to be the second leading mode. The ADM changes markedly across seasons. In autumn-winter, it has a pole over Siberia and a pole over Greenland, at opposite signs at a several-year scale, whereas the spring-summer ADM (ADMSS) has a pole over Europe and a pole over Canada. In the 1980s, the most influential mode shifted from the NAM to the ADM, when the Pacific sector had low ice cover at a 1-year lag from the positive ADM, which was marked by low pressure over Siberia. In years when the ADMSS was pronounced, it was responsible for distinct ice variability over the East Siberian-Laptev seas. The frequency separation in this study identified the contributions of the ADM and ADMSS. Effects of the latter are difficult to predict since it is intermittent and changes its sign biennially. The ADM and ADMSS should be closely watched in relation to the ongoing ice reduction in the Pacific-Siberian region. A part of "References" has been corrected. Article in Journal/Newspaper Arctic Basin Arctic Arctic Ocean Greenland laptev National Snow and Ice Data Center Polar Research Sea ice Siberia Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Arctic Arctic Ocean Canada Greenland Pacific Polar Research 31 1 18690 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
Sea ice sea-level pressure Arctic interannual variability EOF analysis 452 |
spellingShingle |
Sea ice sea-level pressure Arctic interannual variability EOF analysis 452 Ikeda, Motoyoshi Sea-ice cover anomalies in the Arctic Basin associated with atmospheric variability from multi-decadal trends to intermittent quasi-biennial oscillations |
topic_facet |
Sea ice sea-level pressure Arctic interannual variability EOF analysis 452 |
description |
Arctic Ocean sea ice has been diminishing since 1970, as shown by National Snow and Ice Data Center data. In addition to decadal variability, low ice anomalies in the Pacific-Siberian region have been occurring at shorter timescales. The influence of the widely-known Northern Annular Mode (NAM) occurs across all seasons. In this study, empirical orthogonal function (EOF) analysis was applied to sea-level pressure in National Centers for Environmental Prediction Reanalysis data for 1960-2007, showing the NAM to be the leading mode of variability and the Arctic Dipole Mode (ADM) to be the second leading mode. The ADM changes markedly across seasons. In autumn-winter, it has a pole over Siberia and a pole over Greenland, at opposite signs at a several-year scale, whereas the spring-summer ADM (ADMSS) has a pole over Europe and a pole over Canada. In the 1980s, the most influential mode shifted from the NAM to the ADM, when the Pacific sector had low ice cover at a 1-year lag from the positive ADM, which was marked by low pressure over Siberia. In years when the ADMSS was pronounced, it was responsible for distinct ice variability over the East Siberian-Laptev seas. The frequency separation in this study identified the contributions of the ADM and ADMSS. Effects of the latter are difficult to predict since it is intermittent and changes its sign biennially. The ADM and ADMSS should be closely watched in relation to the ongoing ice reduction in the Pacific-Siberian region. A part of "References" has been corrected. |
format |
Article in Journal/Newspaper |
author |
Ikeda, Motoyoshi |
author_facet |
Ikeda, Motoyoshi |
author_sort |
Ikeda, Motoyoshi |
title |
Sea-ice cover anomalies in the Arctic Basin associated with atmospheric variability from multi-decadal trends to intermittent quasi-biennial oscillations |
title_short |
Sea-ice cover anomalies in the Arctic Basin associated with atmospheric variability from multi-decadal trends to intermittent quasi-biennial oscillations |
title_full |
Sea-ice cover anomalies in the Arctic Basin associated with atmospheric variability from multi-decadal trends to intermittent quasi-biennial oscillations |
title_fullStr |
Sea-ice cover anomalies in the Arctic Basin associated with atmospheric variability from multi-decadal trends to intermittent quasi-biennial oscillations |
title_full_unstemmed |
Sea-ice cover anomalies in the Arctic Basin associated with atmospheric variability from multi-decadal trends to intermittent quasi-biennial oscillations |
title_sort |
sea-ice cover anomalies in the arctic basin associated with atmospheric variability from multi-decadal trends to intermittent quasi-biennial oscillations |
publisher |
Norwegian Polar Institute |
url |
http://hdl.handle.net/2115/49571 https://doi.org/10.3402/polar.v31i0.18690 |
geographic |
Arctic Arctic Ocean Canada Greenland Pacific |
geographic_facet |
Arctic Arctic Ocean Canada Greenland Pacific |
genre |
Arctic Basin Arctic Arctic Ocean Greenland laptev National Snow and Ice Data Center Polar Research Sea ice Siberia |
genre_facet |
Arctic Basin Arctic Arctic Ocean Greenland laptev National Snow and Ice Data Center Polar Research Sea ice Siberia |
op_relation |
http://hdl.handle.net/2115/49571 Polar Research, 31: 18690 http://dx.doi.org/10.3402/polar.v31i0.18690 |
op_rights |
http://creativecommons.org/licenses/by-nc/3.0/ |
op_rightsnorm |
CC-BY-NC |
op_doi |
https://doi.org/10.3402/polar.v31i0.18690 |
container_title |
Polar Research |
container_volume |
31 |
container_issue |
1 |
container_start_page |
18690 |
_version_ |
1766303339042045952 |