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Earth and Space Sciences · 术语表

什么是 Saturated adiabatic lapse rate; moist adiabat?

又称: saturated adiabatic lapse rate · moist adiabat

Definition 21.9 University Earth and Space Sciences — Year 2 · 第 21 章 — Atmospheric Thermodynamics

The saturated adiabatic lapse rate Γs\Gamma_s is the rate at which the temperature of a saturated parcel falls as it rises, its vapour condensing to keep it saturated. The curve it follows on a diagram of temperature against pressure is a moist adiabat. When the condensed water is assumed to fall out at once, the ascent is called pseudo-adiabatic.

示例

Example 21.20 (The energy in the Norman sounding)

Lift the surface air of Example 21.4. It saturates at 964 hPa964\,\mathrm{hPa}, 64 m64\,\mathrm{m} up, and follows a moist adiabat. Below 900 hPa900\,\mathrm{hPa} the sounding is itself nearly saturated and the parcel stays a few tenths of a degree colder than its surroundings; then comes the inversion between 908 hPa908\,\mathrm{hPa} and 889 hPa889\,\mathrm{hPa}, where the temperature rises by 4.1 K4.1\,\mathrm{K} in 178 m178\,\mathrm{m} and the parcel finds itself 5 K5\,\mathrm{K} too cold. It becomes warmer than its surroundings only at 732 hPa732\,\mathrm{hPa}, 2.4 km2.4\,\mathrm{km} above the ground, its LFC, and stays warmer up to its EL at 236 hPa236\,\mathrm{hPa}, 10.9 km10.9\,\mathrm{km} above sea level, just below the tropopause the sounding reports at 235 hPa235\,\mathrm{hPa}. On a fine grid of pressures the areas of the skew-T figure are CAPE =2100 J/kg= 2100\,\mathrm{J}/\mathrm{kg} and CIN =−200 J/kg= -200\,\mathrm{J}/\mathrm{kg} with the temperature, and 2230 J/kg2230\,\mathrm{J}/\mathrm{kg} and −130 J/kg-130\,\mathrm{J}/\mathrm{kg} with the virtual temperature: the moisture of the parcel adds its own buoyancy. Parcel theory gives wmax⁡=2×2100=65 m/sw_{\max} = \sqrt{2 \times 2100} = 65\,\mathrm{m}/\mathrm{s}.

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