A positive phase of the Arctic Oscillation (AO) is associated with:
A. Cooler than normal temperatures in the Arctic
B. Higher than normal pressure over the Arctic
C. Lower than normal pressure over the Arctic
D. Warmer than normal temperatures in the Arctic
Answer: Option C
Solution (By JKExamLibrary)
A positive AO phase is characterized by lower than normal pressure over the Arctic and higher than normal pressure over the mid-latitudes. This tends to confine cold air to the Arctic, leading to milder winters in the mid-latitudes.
Explanation:
Polar maritime air masses are cold and humid, originating over cold ocean waters in polar regions. They often bring cool, cloudy, and wet weather to affected regions.
Explanation:
Tropical cyclones are warm-core systems, meaning they are powered by the release of latent heat from condensation in the warm, moist air. Extratropical cyclones are cold-core systems.
Explanation:
Lake-effect snow is most common near the Great Lakes in North America, where cold air masses from Canada move over the relatively warm waters of the lakes, producing significant snowfall.
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