Question

What is difference between normal lapse ratae and adiabetic lapse rate?

Answer 1

Lapse rate, rate of change in temperature observed while moving upward through the Earth’s atmosphere. The lapse rate is considered positive when the temperature decreases with elevation, zero when the temperature is constant with elevation, and negative when the temperature increases with elevation (temperature inversion). The lapse rate of nonrising air—commonly referred to as the normal, or environmental, lapse rate—is highly variable, being affected by radiation, convection, and condensation; it averages about 6.5 °C per kilometre (18.8 °F per mile) in the lower atmosphere (troposphere). It differs from the adiabatic lapse rate, which involves temperature changes due to the rising or sinking of an air parcel. Adiabatic lapse rates are usually differentiated as dry or moist.

Answer 2

Explanation:

Normal Lapse rate is when temperature decreases with altitude i.e. due to the lower number of molecules as we go up resulting in less heat absorption as a system.

Whereas adiabatic lapse rate is when temperature of an air mass decreases as it expands while going up. This air mass contains moisture which results in a decreased rate.

• Normal Lapse rate: 6.5°C decrease per 1000m ascent.
• Dry Lapse Rate: 10°C decrease per 1000m ascent .
• Moist Lapse Rate: 6°C decrease per 1000m ascent.