Ch06_Stab-cloud_107 - Ch. 6 Stability & Cloud...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
6.1 Atmospheric Stability and Its Determination 6.2 Cloud Development Ch. 6 Stability & Cloud Development Lenticular clouds
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
What makes air rise and sink? Why do clouds form on some days and not on others? What determines the shape and size of clouds? Knowing the air’s stability will help us answer these questions. The tendency of the air to rise or sink dictates the formation of clouds. Stability is how we measure this tendency. Atmospheric Stability Atmospheric Stability
Background image of page 2
Stable - a disturbed object returns to its original position. This is shown with rock “A”. Atmospheric Stability –cont’d Atmospheric Stability –cont’d Unstable - a slightly disturbed object moves away from the original position, as shown by rock “B”.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Air parcel is a small chunk of air encased in an imaginary elastic wrap. Like a hot balloon It expands and contracts freely while embedded in environment. Not break It has neither external air nor heat exchange with environment Process of no heat exchange is called adiabatic process An Air Parcel An Air Parcel
Background image of page 4
A lapse rate is the rate of temperature decrease with altitude in the atmosphere. It is given as positive values (example: 10°C per 1000 meters) even though it describes temperature decrease. A negative lapse rate indicates a temperature inversion (temperature increasing with height). The Lapse Rate positive negative
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Since environment pressure decreases with altitude, a rising parcel expands and sinking parcel contracts Expansion pushes parcel wall using its internal energy Rising parcel cools (and sinking parcel warms) The cooling or heating rate is called adiabatic lapse rate Adiabatic Lapse Rate Adiabatic Lapse Rate Adiabatic = no heat exchange
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/17/2012 for the course UNDERSTAND 212 taught by Professor Qi during the Spring '12 term at Saint Louis.

Page1 / 30

Ch06_Stab-cloud_107 - Ch. 6 Stability & Cloud...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online