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Image : Arctic Ocean Oscillation Index (AOO)

Figure 1 Illustration of the AOO index definition and physical meaning. Annual simulated sea surface heights (cm, contour interval is 10 cm) and ice drift (blue arrows) under CCR (left) and ACCR (right) wind forcing. Red dotted isolines depict SLP (hPa, contour interval is 2 hPa). The red arrows in the yellow box show how gradients of sea surface heights (AOO indices) are calculated: differences between sea surface heights in the center (A) and periphery of the closed circulation (B) are divided by the distance between chosen sea surface height isolines. Note that AOO index is non-dimensional. Anticyclonic circulation has positive sea surface height gradients (AOO indices) while cyclonic circulation has negative gradients (AOO indices).


Last updated: November 6, 2019

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