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What Makes Fog Form Over Lakes in Cold Mornings
为什么寒冷的清晨湖面会起雾
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Cold air moves over warmer lake water early in winter.初冬时节，冷空气流经较暖的湖面。
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Water vapor rises from the lake and meets the chilly air above.湖面蒸发的水汽上升，遇上方寒冷空气。
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When warm moist air cools fast, tiny water droplets form.暖湿空气骤然冷却，形成微小水滴。
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These droplets hang low and create thick morning fog.这些水滴悬浮低空，形成浓重晨雾。
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Fog often disappears after sunrise warms the air again.日出后空气回暖，雾常随之消散。
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It happens most where lakes are large and air is very cold.这种现象多见于面积广阔的湖泊及严寒空气区域。
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This is a natural example of condensation in action.这是自然界中凝结作用的典型实例。
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Meteorologists watch this pattern to improve local weather forecasts.气象学家观测这一现象以提升当地天气预报精度。