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Woods Hole Oceanographic Institution

Plumbing diagram for the Annular Modes
A cartoon analogy for the random variability of the annular modes. The two tanks of water represent the polar and mid-latitude "reservoirs" of mass in the annular mode (red and blue zones in the figure above). The random mass flows caused by daily weather activity are represented by the pump in the middle. The accumulated mass in the reservoirs varies as a "random walk" process.


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