Which statement best describes the approximate values for the dry adiabatic lapse rate and the moist adiabatic lapse rate?

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Multiple Choice

Which statement best describes the approximate values for the dry adiabatic lapse rate and the moist adiabatic lapse rate?

When an air parcel rises, its temperature changes with height depending on whether it is dry or saturated. For a rising dry (unsaturated) parcel, there’s no condensation, so it cools at the dry adiabatic lapse rate, which is about 9.8°C per kilometer. If the parcel becomes saturated and condensation occurs, latent heat is released into the parcel, which slows the cooling; this gives the moist adiabatic lapse rate, typically around 5–6°C per kilometer (though it can vary with moisture and temperature). So the best description is that the dry rate is about 9.8°C per kilometer and the moist rate is about 5–6°C per kilometer, due to latent heat release. The other statements misstate the relative magnitudes or the cause of the difference.

When an air parcel rises, its temperature changes with height depending on whether it is dry or saturated. For a rising dry (unsaturated) parcel, there’s no condensation, so it cools at the dry adiabatic lapse rate, which is about 9.8°C per kilometer. If the parcel becomes saturated and condensation occurs, latent heat is released into the parcel, which slows the cooling; this gives the moist adiabatic lapse rate, typically around 5–6°C per kilometer (though it can vary with moisture and temperature).

So the best description is that the dry rate is about 9.8°C per kilometer and the moist rate is about 5–6°C per kilometer, due to latent heat release. The other statements misstate the relative magnitudes or the cause of the difference.

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