An anabatic wind is a local “upslope” wind. During the day, the sun heats the mountain slopes, which in turn heats the air touching them. This air becomes warmer and lighter than the air at the same altitude in the center of the valley. The warm air then rises up the mountain side, creating a gentle breeze. ANSWER: (B) A wind that blows during the day up a mountain slope
What is an “Anabatic Wind”? (A) A wind that blows at night down a valley (B) A wind that blows during the day up a mountain slope (C) A wind caused by the moon’s gravity (D) A wind that only occurs over the ocean
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Anabatic winds are part of the daily “mountain-valley” breeze cycle. Because mountain slopes are tilted toward the sun, they absorb heat more effectively than the flat valley floor. As the air on the slopes warms, it expands and rises, pulling cooler air up from the valley to take its place. This is why hikers often feel a breeze blowing in their faces as they climb during the morning. At night, the process reverses into a “katabatic” or “mountain breeze,” where the air cools and slides back down into the valley.
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