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Earth and Space Sciences · 术语表

什么是 Condensation level?

Definition 4.7 High School Earth and Space Sciences · 第 4 章 — Why Clouds Form

The condensation level of a parcel of air is the height at which, rising, it becomes saturated. Water condenses above it: the condensation level is the flat base of the clouds that the rising air forms.

示例

Example 4.9 (An afternoon cumulus)

In the afternoon of Example 4.4, the air at the ground is at 28∘C28{}^{\circ}\mathrm{C} with a dew point of 16∘C16{}^{\circ}\mathrm{C}. Rising bubbles become saturated at 125×12=1500 m125 \times 12 = 1500\,\mathrm{m}: the cumulus have their flat bases about 1.5 km1.5\,\mathrm{km} up. In the morning, at 20∘C20{}^{\circ}\mathrm{C}, the same air would have condensed at only 125×4=500 m125 \times 4 = 500\,\mathrm{m}: cloud bases rise through the day as the ground warms.

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