What is the typical environmental lapse rate in the lower troposphere?

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Multiple Choice

What is the typical environmental lapse rate in the lower troposphere?

The main idea here is how temperature changes with height in the surrounding air—the environmental lapse rate. In the lower troposphere, the typical rate at which temperature decreases with altitude is about 6.5°C per kilometer. This value comes from the standard atmosphere and represents an average mid-latitude condition, reflecting the combined effects of radiation, mixing, moisture, and latent heat release that shape the actual profile of temperature with height. Why this value over the others: 9.8°C per kilometer is the dry adiabatic lapse rate, which applies to an air parcel rising without moisture changing phase; it’s not the actual environmental profile. A rate of about 3°C per kilometer is too shallow to represent the common decrease with height in the lower troposphere, and about 10°C per kilometer is steeper than what is typically observed. So, 6.5°C per kilometer best describes the everyday environmental lapse rate in the lower troposphere.

The main idea here is how temperature changes with height in the surrounding air—the environmental lapse rate. In the lower troposphere, the typical rate at which temperature decreases with altitude is about 6.5°C per kilometer. This value comes from the standard atmosphere and represents an average mid-latitude condition, reflecting the combined effects of radiation, mixing, moisture, and latent heat release that shape the actual profile of temperature with height.

Why this value over the others: 9.8°C per kilometer is the dry adiabatic lapse rate, which applies to an air parcel rising without moisture changing phase; it’s not the actual environmental profile. A rate of about 3°C per kilometer is too shallow to represent the common decrease with height in the lower troposphere, and about 10°C per kilometer is steeper than what is typically observed. So, 6.5°C per kilometer best describes the everyday environmental lapse rate in the lower troposphere.

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