Hogg Andrew Mc C.

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Hogg
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Andrew Mc C.
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  • Article
    The effects of mesoscale ocean–atmosphere coupling on the large-scale ocean circulation
    (American Meteorological Society, 2009-08-01) Hogg, Andrew Mc C. ; Dewar, William K. ; Berloff, Pavel S. ; Kravtsov, Sergey K. ; Hutchinson, David K.
    Small-scale variation in wind stress due to ocean–atmosphere interaction within the atmospheric boundary layer alters the temporal and spatial scale of Ekman pumping driving the double-gyre circulation of the ocean. A high-resolution quasigeostrophic (QG) ocean model, coupled to a dynamic atmospheric mixed layer, is used to demonstrate that, despite the small spatial scale of the Ekman-pumping anomalies, this phenomenon significantly modifies the large-scale ocean circulation. The primary effect is to decrease the strength of the nonlinear component of the gyre circulation by approximately 30%–40%. This result is due to the highest transient Ekman-pumping anomalies destabilizing the flow in a dynamically sensitive region close to the western boundary current separation. The instability of the jet produces a flux of potential vorticity between the two gyres that acts to weaken both gyres.
  • Article
    The turbulent oscillator : a mechanism of low-frequency variability of the wind-driven ocean gyres
    (American Meteorological Society, 2007-09) Berloff, Pavel S. ; Hogg, Andrew Mc C. ; Dewar, William K.
    Intrinsic low-frequency variability is studied in the idealized, quasigeostrophic, midlatitude, wind-driven ocean gyres operating at large Reynolds number. A robust decadal variability mode driven by the transient mesoscale eddies is found and analyzed. The variability is a turbulent phenomenon, which is driven by the competition between the eddy rectification process and the potential vorticity anomalies induced by changes of the intergyre transport