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What does AO stand for?

AO stands for Arctic Oscillation

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We have 60 other meanings of AO in our Acronym Attic

Samples in periodicals archive:

At the same time, the additional snow cover has triggered a kind of feedback loop by changing what's called the Arctic Oscillation, the air pressure pattern that determines winter weather in the Northern Hemisphere.
They believe the increased snow cover has an intricate effect on the Arctic Oscillation -- an atmospheric pressure pattern in the mid- to high-latitudes -- causing it to remain in the "negative phase.
Masters said that the northeastern United States in Boulder, Colorado, said less sea ice in the Artic translates to more moisture in the atmosphere, and could also cause an atmospheric circulation pattern in polar regions known as Arctic Oscillation this spring.
What with all this climate change that's going on, maybe the southern oscillations have had a swap with the northern oscillations and invited the Arctic oscillation along for a laugh.
ENSO is one of the numbers of climate indices, each reflecting temperature or pressure changes at different locations on the earth's surface, and it has been demonstrated (9) that for the continental United States, seasonal (3-month) temperature and precipitation anomalies are related to climate index combinations, ENSO and Arctic Oscillation (AO), part of the larger Northern Annular Mode (NAM), rather than to a single index.