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Why Mountain Winds Cool as They Rise and Warm When Descending
山风为何上升时冷却、下降时增温
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As air rises up a mountain slope, it expands due to decreasing atmospheric pressure.空气沿山坡上升时，因大气压降低而膨胀。
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This expansion causes adiabatic cooling, even without heat loss to surroundings.这种膨胀导致绝热冷却，即使未向周围散失热量。
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Moist air may condense into clouds and release latent heat partway up.湿润空气在爬升途中可能凝结成云，并释放潜热。
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Once over the peak, dry air descends and compresses under higher pressure.越过山顶后，干燥空气在更高气压下下沉并被压缩。
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Compression leads to adiabatic warming, often raising temperatures rapidly.压缩引发绝热增温，常使气温迅速升高。
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These winds—called foehn or chinook—can melt snow within hours.这类风被称为焚风或奇努克风，数小时内即可融化积雪。
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Temperature differences between windward and leeward sides drive local weather patterns.迎风坡与背风坡之间的温差驱动局地天气模式。
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The process explains why some valleys stay frost-free despite high elevation.该过程解释了为何某些高海拔山谷仍无霜冻。
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Meteorologists use this principle to predict regional temperature anomalies.气象学家利用这一原理预测区域温度异常。
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It demonstrates how thermodynamics governs everyday atmospheric behavior across landscapes.它揭示了热力学如何主导地貌尺度上的日常大气行为。