Planetary Boundary Layer Concepts

The video, presented by Rashid Dividi, explores the planetary boundary layer, the lowest part of the atmosphere directly influenced by the Earth's surface. It discusses how this layer is affected by various physical quantities like air flow, temperature, and moisture, and how pollutants and turbulence play a role in its dynamics. The video also covers temperature lapse rates, including dry and super adiabatic rates, and explains the concept of nocturnal inversion, which leads to thermally stable conditions. The video is available in both English and Hindi.

What is another name for the planetary boundary layer?

• Mesosphere

• Stratosphere

• Exosphere

• Peplosphere

Which physical quantity is NOT mentioned as affecting the planetary boundary layer?

• Temperature

• Moisture

• Flow velocity

• Magnetic field

Which force is balanced with the pressure gradient force in geostrophic winds?

• Frictional force

• Gravitational force

• Coriolis force

• Magnetic force

What causes the dispersion of light in the planetary boundary layer?

• Clouds

• Pollutants

• Rain

• Sunlight

What is the effect of surface friction on wind flow in the planetary boundary layer?

• It strengthens the wind

• It weakens the wind

• It has no effect

• It reverses the wind direction

What is the dry adiabatic lapse rate in the planetary boundary layer?

• 15.0°C per kilometer

• 6.5°C per kilometer

• 9.8°C per kilometer

• 12.0°C per kilometer

On a superheated summer day, the lapse rate is described as:

• Sub-adiabatic

• Super adiabatic

• Dry adiabatic

• Isothermal

What is the normal lapse rate outside the planetary boundary layer?

• 9.8°C per kilometer

• 12.0°C per kilometer

• 15.0°C per kilometer

• 6.5°C per kilometer

What happens to turbulence during a nocturnal inversion?

• It increases

• It remains the same

• It becomes unpredictable

• It decreases

During a nocturnal inversion, the lower wind layer is:

• Warmer than the upper layer

• Cooler than the upper layer

• The same temperature as the upper layer

• Unstable