Decadal Variability of Upper-Ocean Heat Content Associated with Meridional Shifts of Western Boundary Current Extensions in the North Pacific
Generation and propagation processes of upper-ocean heat content (OHC) in the North Pacific are investigated using oceanic subsurface observations and an eddy-resolving ocean general circulation model hindcast simulation. OHC anomalies are decomposed into physically distinct dynamical components (OH...
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ftosti:oai:osti.gov:1537025 2023-07-30T04:07:09+02:00 Decadal Variability of Upper-Ocean Heat Content Associated with Meridional Shifts of Western Boundary Current Extensions in the North Pacific Taguchi, Bunmei Schneider, Niklas Nonaka, Masami Sasaki, Hideharu 2021-08-02 application/pdf http://www.osti.gov/servlets/purl/1537025 https://www.osti.gov/biblio/1537025 https://doi.org/10.1175/jcli-d-16-0779.1 unknown http://www.osti.gov/servlets/purl/1537025 https://www.osti.gov/biblio/1537025 https://doi.org/10.1175/jcli-d-16-0779.1 doi:10.1175/jcli-d-16-0779.1 54 ENVIRONMENTAL SCIENCES 2021 ftosti https://doi.org/10.1175/jcli-d-16-0779.1 2023-07-11T09:34:54Z Generation and propagation processes of upper-ocean heat content (OHC) in the North Pacific are investigated using oceanic subsurface observations and an eddy-resolving ocean general circulation model hindcast simulation. OHC anomalies are decomposed into physically distinct dynamical components (OHC ρ ) due to temperature anomalies that are associated with density anomalies and spiciness components (OHCχ) due to temperature anomalies that are density compensating with salinity. Analysis of the observational and model data consistently shows that both dynamical and spiciness components contribute to interannual–decadal OHC variability, with the former (latter) component dominating in the subtropical (subpolar) North Pacific. OHC ρ variability represents heaving of thermocline, propagates westward, and intensifies along the Kuroshio Extension, consistent with jet-trapped Rossby waves, while OHCχ variability propagates eastward along the subarctic frontal zone, suggesting advection by mean eastward currents. OHCχ variability tightly corresponds in space to horizontal mean spiciness gradients. Meanwhile, area-averaged OHCχ anomalies in the western subarctic frontal zone closely correspond in time to meridional shifts of the subarctic frontal zone. Regression coefficient of the OHCχ time series on the frontal displacement anomalies quantitatively agree with the area-averaged mean spiciness gradient in the region, and suggest that OHCχ is generated via frontal variability in the subarctic frontal zone. Other/Unknown Material Subarctic SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Pacific Journal of Climate 30 16 6247 6264 |
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Open Polar |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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ftosti |
language |
unknown |
topic |
54 ENVIRONMENTAL SCIENCES |
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54 ENVIRONMENTAL SCIENCES Taguchi, Bunmei Schneider, Niklas Nonaka, Masami Sasaki, Hideharu Decadal Variability of Upper-Ocean Heat Content Associated with Meridional Shifts of Western Boundary Current Extensions in the North Pacific |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
Generation and propagation processes of upper-ocean heat content (OHC) in the North Pacific are investigated using oceanic subsurface observations and an eddy-resolving ocean general circulation model hindcast simulation. OHC anomalies are decomposed into physically distinct dynamical components (OHC ρ ) due to temperature anomalies that are associated with density anomalies and spiciness components (OHCχ) due to temperature anomalies that are density compensating with salinity. Analysis of the observational and model data consistently shows that both dynamical and spiciness components contribute to interannual–decadal OHC variability, with the former (latter) component dominating in the subtropical (subpolar) North Pacific. OHC ρ variability represents heaving of thermocline, propagates westward, and intensifies along the Kuroshio Extension, consistent with jet-trapped Rossby waves, while OHCχ variability propagates eastward along the subarctic frontal zone, suggesting advection by mean eastward currents. OHCχ variability tightly corresponds in space to horizontal mean spiciness gradients. Meanwhile, area-averaged OHCχ anomalies in the western subarctic frontal zone closely correspond in time to meridional shifts of the subarctic frontal zone. Regression coefficient of the OHCχ time series on the frontal displacement anomalies quantitatively agree with the area-averaged mean spiciness gradient in the region, and suggest that OHCχ is generated via frontal variability in the subarctic frontal zone. |
author |
Taguchi, Bunmei Schneider, Niklas Nonaka, Masami Sasaki, Hideharu |
author_facet |
Taguchi, Bunmei Schneider, Niklas Nonaka, Masami Sasaki, Hideharu |
author_sort |
Taguchi, Bunmei |
title |
Decadal Variability of Upper-Ocean Heat Content Associated with Meridional Shifts of Western Boundary Current Extensions in the North Pacific |
title_short |
Decadal Variability of Upper-Ocean Heat Content Associated with Meridional Shifts of Western Boundary Current Extensions in the North Pacific |
title_full |
Decadal Variability of Upper-Ocean Heat Content Associated with Meridional Shifts of Western Boundary Current Extensions in the North Pacific |
title_fullStr |
Decadal Variability of Upper-Ocean Heat Content Associated with Meridional Shifts of Western Boundary Current Extensions in the North Pacific |
title_full_unstemmed |
Decadal Variability of Upper-Ocean Heat Content Associated with Meridional Shifts of Western Boundary Current Extensions in the North Pacific |
title_sort |
decadal variability of upper-ocean heat content associated with meridional shifts of western boundary current extensions in the north pacific |
publishDate |
2021 |
url |
http://www.osti.gov/servlets/purl/1537025 https://www.osti.gov/biblio/1537025 https://doi.org/10.1175/jcli-d-16-0779.1 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Subarctic |
genre_facet |
Subarctic |
op_relation |
http://www.osti.gov/servlets/purl/1537025 https://www.osti.gov/biblio/1537025 https://doi.org/10.1175/jcli-d-16-0779.1 doi:10.1175/jcli-d-16-0779.1 |
op_doi |
https://doi.org/10.1175/jcli-d-16-0779.1 |
container_title |
Journal of Climate |
container_volume |
30 |
container_issue |
16 |
container_start_page |
6247 |
op_container_end_page |
6264 |
_version_ |
1772820275197378560 |