American Meteorological Society Certification Thermodynamics and Atmospheric Stability

Question 1

What does the dry adiabatic lapse rate (DALR) represent?

Accepted Answer

Rate at which unsaturated air cools as it rises (≈9.8°C/km)

Answer

The DALR (~9.8°C/km) is the rate at which a dry (unsaturated) air parcel cools as it rises adiabatically.

Question 2

What is the Lifted Index (LI) used to assess?

Accepted Answer

Atmospheric stability and convective potential

Answer

The Lifted Index measures stability by comparing the temperature of a lifted parcel to the environment at 500 hPa; negative values indicate instability.

Question 3

What is the Level of Free Convection (LFC)?

Accepted Answer

The level where a lifted parcel becomes warmer than the environment and rises freely

Answer

The LFC is the altitude where a lifted parcel's temperature first exceeds the environmental temperature, allowing free convective ascent.

Question 4

CAPE (Convective Available Potential Energy) is measured in which units?

Accepted Answer

Joules per kilogram (J/kg)

Answer

CAPE is expressed in J/kg and represents the positive buoyant energy available to a rising parcel of air.

Question 5

A temperature inversion in the lower atmosphere refers to what condition?

Accepted Answer

Temperature increasing with height rather than decreasing

Answer

An inversion occurs when temperature increases with altitude, creating a stable layer that suppresses vertical mixing.

American Meteorological Society Certification Practice Test

American Meteorological Society Certification Practice Test

American Meteorological Society Certification Thermodynamics and Atmospheric Stability