Interannual Variability of Water Circulation Regimes in the Arctic Ocean
The article studies the interannual variability of the Arctic Ocean water circulation regimes according to altimetry data for the area from 65°N to 89.75°N including the ice-covered area of the ocean. The purpose of the work is to study the variability of the ocean level and the velocities of surfac...
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Federal State Budget Scientific Institution «Marine Hydrophysical Institute of RAS»
2023
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ftdoajarticles:oai:doaj.org/article:32bbca52eef94a17ab5ec279ea3ba94f 2023-09-05T13:16:10+02:00 Interannual Variability of Water Circulation Regimes in the Arctic Ocean E.E. Lemeshko 2023-03-01T00:00:00Z https://doaj.org/article/32bbca52eef94a17ab5ec279ea3ba94f EN RU eng rus Federal State Budget Scientific Institution «Marine Hydrophysical Institute of RAS» http://ecological-safety.ru/en/repository/issues/2023/01/04/20230104.pdf https://doaj.org/toc/2413-5577 2413-5577 https://doaj.org/article/32bbca52eef94a17ab5ec279ea3ba94f Экологическая безопасность прибрежной и шельфовой зон моря, Iss 1, Pp 48-64 (2023) arctic ocean altimetry steric level arctic oscillation ocean circulation regimes grace Ecology QH540-549.5 article 2023 ftdoajarticles 2023-08-13T00:35:48Z The article studies the interannual variability of the Arctic Ocean water circulation regimes according to altimetry data for the area from 65°N to 89.75°N including the ice-covered area of the ocean. The purpose of the work is to study the variability of the ocean level and the velocities of surface geostrophic currents depending on the value of the Arctic oscillation index, and to establish quantitative patterns between them. In addition, the paper considers the influence of different ocean circulation regimes and the value of the Arctic oscillation index on the steric level variability as an indicator of freshening/salinization processes in the polar region north of 81.5○N. The steric component of level was calculated as the difference between the dynamic topography from altimetry data and the GRACE data of the manometric level component. On an interannual time scale, the sea level response averaged over the Arctic Ocean is in antiphase with the Arctic Oscillation Index. Based on the method of multiple regression, quantitative estimates of the dependence of the sea level and geostrophic velocity components on the value of the Arctic oscillation index were obtained. The level difference between the shelf and the deeper part of the ocean was ~4 cm per unit of the Arctic oscillation index. The difference between the areas of positive and negative values of the sea level anomalies creates a pressure gradient, which leads to an increase in the anomalies of surface geostrophic velocities and enhances the inflow of Atlantic waters along the shelf edge in an easterly direction during the cyclonic regime (Arctic Oscillation Index is greater than 0). Under the anticyclonic regime of atmospheric circulation (the index is less than 0), the effect becomes opposite. This agrees with the estimates of the linear regression coefficients for the velocity anomalies of geostrophic currents, which amounted to ~0.5 cm/s per 1 index unit. On the basis of the obtained results, a conceptual scheme of the regimes of circulation and ... Article in Journal/Newspaper Arctic Arctic Ocean Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean |
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language |
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topic |
arctic ocean altimetry steric level arctic oscillation ocean circulation regimes grace Ecology QH540-549.5 |
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arctic ocean altimetry steric level arctic oscillation ocean circulation regimes grace Ecology QH540-549.5 E.E. Lemeshko Interannual Variability of Water Circulation Regimes in the Arctic Ocean |
topic_facet |
arctic ocean altimetry steric level arctic oscillation ocean circulation regimes grace Ecology QH540-549.5 |
description |
The article studies the interannual variability of the Arctic Ocean water circulation regimes according to altimetry data for the area from 65°N to 89.75°N including the ice-covered area of the ocean. The purpose of the work is to study the variability of the ocean level and the velocities of surface geostrophic currents depending on the value of the Arctic oscillation index, and to establish quantitative patterns between them. In addition, the paper considers the influence of different ocean circulation regimes and the value of the Arctic oscillation index on the steric level variability as an indicator of freshening/salinization processes in the polar region north of 81.5○N. The steric component of level was calculated as the difference between the dynamic topography from altimetry data and the GRACE data of the manometric level component. On an interannual time scale, the sea level response averaged over the Arctic Ocean is in antiphase with the Arctic Oscillation Index. Based on the method of multiple regression, quantitative estimates of the dependence of the sea level and geostrophic velocity components on the value of the Arctic oscillation index were obtained. The level difference between the shelf and the deeper part of the ocean was ~4 cm per unit of the Arctic oscillation index. The difference between the areas of positive and negative values of the sea level anomalies creates a pressure gradient, which leads to an increase in the anomalies of surface geostrophic velocities and enhances the inflow of Atlantic waters along the shelf edge in an easterly direction during the cyclonic regime (Arctic Oscillation Index is greater than 0). Under the anticyclonic regime of atmospheric circulation (the index is less than 0), the effect becomes opposite. This agrees with the estimates of the linear regression coefficients for the velocity anomalies of geostrophic currents, which amounted to ~0.5 cm/s per 1 index unit. On the basis of the obtained results, a conceptual scheme of the regimes of circulation and ... |
format |
Article in Journal/Newspaper |
author |
E.E. Lemeshko |
author_facet |
E.E. Lemeshko |
author_sort |
E.E. Lemeshko |
title |
Interannual Variability of Water Circulation Regimes in the Arctic Ocean |
title_short |
Interannual Variability of Water Circulation Regimes in the Arctic Ocean |
title_full |
Interannual Variability of Water Circulation Regimes in the Arctic Ocean |
title_fullStr |
Interannual Variability of Water Circulation Regimes in the Arctic Ocean |
title_full_unstemmed |
Interannual Variability of Water Circulation Regimes in the Arctic Ocean |
title_sort |
interannual variability of water circulation regimes in the arctic ocean |
publisher |
Federal State Budget Scientific Institution «Marine Hydrophysical Institute of RAS» |
publishDate |
2023 |
url |
https://doaj.org/article/32bbca52eef94a17ab5ec279ea3ba94f |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean |
genre_facet |
Arctic Arctic Ocean |
op_source |
Экологическая безопасность прибрежной и шельфовой зон моря, Iss 1, Pp 48-64 (2023) |
op_relation |
http://ecological-safety.ru/en/repository/issues/2023/01/04/20230104.pdf https://doaj.org/toc/2413-5577 2413-5577 https://doaj.org/article/32bbca52eef94a17ab5ec279ea3ba94f |
_version_ |
1776197857677672448 |