Observed basin-scale response of the North Atlantic meridional overturning circulation to wind stress forcing

Shane Elipot, Eleanor Frajka-Williams, Chris W. Hughes, Sofia Olhede, Matthias Lankhorst

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

The response of the North Atlantic meridional overturning circulation (MOC) to wind stress forcing is investigated from an observational standpoint, using four time series of overturning transports below and relative to 1000 m, overlapping by 3.6 yr. These time series are derived from four mooring arrays located on the western boundary of the North Atlantic: the RAPID Western Atlantic Variability Experiment (WAVE) array (42.5°N), the Woods Hole Oceanographic Institution Line W array (39°N), RAPID-MOC/MOCHA (26.5°N), and the Meridional Overturning Variability Experiment (MOVE) array (16°N). Using modal decompositions of the analytic cross-correlation between transports and wind stress, the basin-scale wind stress is shown to significantly drive the MOC coherently at four latitudes, on the time scales available for this study. The dominant mode of covariance is interpreted as rapid barotropic oceanic adjustments to wind stress forcing, eventually forming two counterrotating Ekman overturning cells centered on the tropics and subtropical gyre. A second mode of covariance appears related to patterns of wind stress and wind stress curl associated with the North Atlantic Oscillation, spinning anomalous horizontal circulations that likely interact with topography to form overturning cells.

Original languageEnglish (US)
Pages (from-to)2029-2054
Number of pages26
JournalJournal of Climate
Volume30
Issue number6
DOIs
StatePublished - 2017

Keywords

  • Meridional overturning circulation
  • North Atlantic Ocean
  • Ocean circulation
  • Statistical techniques
  • Time series
  • Wind stress

ASJC Scopus subject areas

  • Atmospheric Science

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