q 2001 American Meteorological Society Ocean Gyre Circulation Changes Associated with the North Atlantic Oscillation*
Observational evidence is presented for interannual to interdecadal variability in the intensity of the North Atlantic gyre circulation related to the atmospheric North Atlantic Oscillation (NAO) patterns. A two-point baroclinic pressure difference between the subtropical and subpolar gyre centers—a...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.596.3342 2023-05-15T17:25:18+02:00 q 2001 American Meteorological Society Ocean Gyre Circulation Changes Associated with the North Atlantic Oscillation* Ruth G. Curry Michael S. Mccartney Woods Hole The Pennsylvania State University CiteSeerX Archives 2000 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.596.3342 http://www.whoi.edu/science/PO/people/mmccartney/pdfs/CurryMcCartney.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.596.3342 http://www.whoi.edu/science/PO/people/mmccartney/pdfs/CurryMcCartney.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.whoi.edu/science/PO/people/mmccartney/pdfs/CurryMcCartney.pdf text 2000 ftciteseerx 2016-01-08T13:45:08Z Observational evidence is presented for interannual to interdecadal variability in the intensity of the North Atlantic gyre circulation related to the atmospheric North Atlantic Oscillation (NAO) patterns. A two-point baroclinic pressure difference between the subtropical and subpolar gyre centers—an oceanic analogue to the much-used sea level pressure (SLP)-based atmospheric NAO indices—is constructed from time series of potential energy anomaly (PEA) derived from hydrographic measurements in the Labrador Basin and at Station S near Bermuda. Representing the upper 2000-db eastward baroclinic mass transport between the two centers, the transport index indicates a Gulf Stream and North Atlantic Current that gradually weakened during the low NAO period of the 1960s and then intensified in the subsequent 25 years of persistently high NAO to a record peak in the 1990s. The peak-to-peak amplitude difference was 15–20 megatons per second (MT s 21) with a 43-yr mean of about 60 MT s21 a change of 25%–33 % occurring between 1970 and 1995. The timing of the ocean fluctuation is organized around the same temporal structure as the NAO index. The two are not directly covariant, but to first order, the ocean signal reflects a time integration, through mixed layer ‘‘memory’ ’ and Rossby wave propagation, of the atmospheric forcing. To some degree, the gyre PEA histories are fluctuating in antiphase reflecting latitudinal shifts of the surface Text north atlantic current North Atlantic North Atlantic oscillation Unknown |
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English |
description |
Observational evidence is presented for interannual to interdecadal variability in the intensity of the North Atlantic gyre circulation related to the atmospheric North Atlantic Oscillation (NAO) patterns. A two-point baroclinic pressure difference between the subtropical and subpolar gyre centers—an oceanic analogue to the much-used sea level pressure (SLP)-based atmospheric NAO indices—is constructed from time series of potential energy anomaly (PEA) derived from hydrographic measurements in the Labrador Basin and at Station S near Bermuda. Representing the upper 2000-db eastward baroclinic mass transport between the two centers, the transport index indicates a Gulf Stream and North Atlantic Current that gradually weakened during the low NAO period of the 1960s and then intensified in the subsequent 25 years of persistently high NAO to a record peak in the 1990s. The peak-to-peak amplitude difference was 15–20 megatons per second (MT s 21) with a 43-yr mean of about 60 MT s21 a change of 25%–33 % occurring between 1970 and 1995. The timing of the ocean fluctuation is organized around the same temporal structure as the NAO index. The two are not directly covariant, but to first order, the ocean signal reflects a time integration, through mixed layer ‘‘memory’ ’ and Rossby wave propagation, of the atmospheric forcing. To some degree, the gyre PEA histories are fluctuating in antiphase reflecting latitudinal shifts of the surface |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Ruth G. Curry Michael S. Mccartney Woods Hole |
spellingShingle |
Ruth G. Curry Michael S. Mccartney Woods Hole q 2001 American Meteorological Society Ocean Gyre Circulation Changes Associated with the North Atlantic Oscillation* |
author_facet |
Ruth G. Curry Michael S. Mccartney Woods Hole |
author_sort |
Ruth G. Curry |
title |
q 2001 American Meteorological Society Ocean Gyre Circulation Changes Associated with the North Atlantic Oscillation* |
title_short |
q 2001 American Meteorological Society Ocean Gyre Circulation Changes Associated with the North Atlantic Oscillation* |
title_full |
q 2001 American Meteorological Society Ocean Gyre Circulation Changes Associated with the North Atlantic Oscillation* |
title_fullStr |
q 2001 American Meteorological Society Ocean Gyre Circulation Changes Associated with the North Atlantic Oscillation* |
title_full_unstemmed |
q 2001 American Meteorological Society Ocean Gyre Circulation Changes Associated with the North Atlantic Oscillation* |
title_sort |
q 2001 american meteorological society ocean gyre circulation changes associated with the north atlantic oscillation* |
publishDate |
2000 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.596.3342 http://www.whoi.edu/science/PO/people/mmccartney/pdfs/CurryMcCartney.pdf |
genre |
north atlantic current North Atlantic North Atlantic oscillation |
genre_facet |
north atlantic current North Atlantic North Atlantic oscillation |
op_source |
http://www.whoi.edu/science/PO/people/mmccartney/pdfs/CurryMcCartney.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.596.3342 http://www.whoi.edu/science/PO/people/mmccartney/pdfs/CurryMcCartney.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766116700552429568 |