Ocean Gyre Circulation Changes Associated with the North Atlantic Oscillation*
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No Canadian affiliation. An affiliation-only frame — the usual design — would never have seen this work. It is one of the works that make the case for inverting the frame.
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- Teacher spread
- 0.205 · how far apart the two teachers sit on this one work
- Validation status
score_only:v0-immature-baseline· verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it
Abstract
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 1 ) with a 43yr mean of about 60 MT s 1 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.
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The record
- Venue
- Journal of Physical Oceanography
- Topic
- Climate variability and models
- Field
- Environmental Science
- Canadian institutions
- —
- Funders
- National Oceanic and Atmospheric AdministrationNational Science Foundation
- Keywords
- Ocean gyreNorth Atlantic oscillationBaroclinityClimatologyRossby waveGeologyGulf StreamOceanographyWesterliesAtmospheric circulationQuasi-biennial oscillationAtlantic multidecadal oscillationForcing (mathematics)North Atlantic Deep WaterOcean currentThermohaline circulationSubtropicsTroposphere
- Has abstract in OpenAlex
- yes