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Volume 16 Issue 3

Jul.  1999

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Article >  ADVANCES IN ATMOSPHERIC SCIENCES  > 1999 >  16(3): 323-342

Centennial Oscillations in an Ocean-ice Coupled Model

  • 1.

    LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Dept. of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, MA 02543,Dept. of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, MA 02543


doi: 10.1007/s00376-999-0012-5

  • Irregular centennial oscillations, with a spectral peak at 106 years, were obtained from an ocean-ice coupled model for the North Atlantic with realistic coastline and bottom topography. The model’s thermohaline circulation is forced by mixed boundary conditions, i.e., a Haney-type relaxation condition for temperature, but an equivalent virtual salt flux condition for salinity. All forcing fields are taken from the observed monthly mean climatological wind stress and buoyancy fluxes. The oscillations appeared in the form of a surface-intensified tripole in both the sea surface temperature and salinity fields located in the vicinity of the Labrador Sea. The oscillations involve a delicate interplay between heat and fresh water advection by meridional overturning circulation, horizontal gyres, vertical convection, and the seasonal cycle. The oscillations are primarily control?led by the salinity component of the circulation; however, sea ice plays a minor role in driving the oscillations observed in the model. On the other hand, a regular seasonal cycle in the forcing fields is an important ingredient for the centennial oscillations.
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    • Manuscript History

    Manuscript received: 10 July 1999
    Manuscript revised: 10 July 1999
    通讯作者: 陈斌, bchen63@163.com
    • 1. 

      沈阳化工大学材料科学与工程学院 沈阳 110142

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    Centennial Oscillations in an Ocean-ice Coupled Model

    • 1. LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Dept. of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, MA 02543,Dept. of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, MA 02543
    • Manuscript received: 1999-07-10
    • Manuscript revised: 1999-07-10

    Abstract: Irregular centennial oscillations, with a spectral peak at 106 years, were obtained from an ocean-ice coupled model for the North Atlantic with realistic coastline and bottom topography. The model’s thermohaline circulation is forced by mixed boundary conditions, i.e., a Haney-type relaxation condition for temperature, but an equivalent virtual salt flux condition for salinity. All forcing fields are taken from the observed monthly mean climatological wind stress and buoyancy fluxes. The oscillations appeared in the form of a surface-intensified tripole in both the sea surface temperature and salinity fields located in the vicinity of the Labrador Sea. The oscillations involve a delicate interplay between heat and fresh water advection by meridional overturning circulation, horizontal gyres, vertical convection, and the seasonal cycle. The oscillations are primarily control?led by the salinity component of the circulation; however, sea ice plays a minor role in driving the oscillations observed in the model. On the other hand, a regular seasonal cycle in the forcing fields is an important ingredient for the centennial oscillations.

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