{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

ATOC 1050 chapter 5 notes

ATOC 1050 chapter 5 notes - Chapter 5 Atmospheric Stability...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 5 – Atmospheric Stability ATOC 1050 I. Concept of stability: A. Stable – if you give air a vertical “push”, it falls back into place or spreads horizontally. B. Unstable - if you give air a vertical “push”, it accelerates away from its initial position. C. Neutral – if you give the air a vertical “push”, it will remain in its new position. D. What is a “push”? 1. Mechanical push – cold fronts, wind shifts, orographic, low pressure trough, stationary fronts, etc. 2. Thermodynamic push– day time heating (warm the surface) E. Adiabatic process = heating/cooling due only to compression/expansion of air. Important – NO HEAT ENERGY ADDED! 1
Background image of page 1

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

View Full Document Right Arrow Icon
F. Lapse rate = temperature change with height. 1. Dry adiabatic lapse rate (DALR) = 10 ° C/km [Use DLR for dry air (no clouds)]. 2. Saturated (or moist/wet) adiabatic lapse rate (SALR) 2245 6 ° C/km [Use SLR when air is saturated (clouds)]. Why is the SLR less than the DLR? 3. Environmental lapse rate (ELR) = temperature measured by the radio/rawinsondes. That is, how the temperature is actually changing with height. This can vary from hour to hour, day to day which is why it is measured twice a day! Example of 7 ° C/km ELR and a -5 ° C/km ELR: 2
Background image of page 2
3
Background image of page 3

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

View Full Document Right Arrow Icon
II. Why do we care about stability? A. Unstable air is required for thunderstorms including severe thunderstorms. B. Thunderstorms are severe if they have 1 or more of the following: 1. Hail ¾ inches in diameter 2. Funnel cloud (a funnel cloud that touches ground is a tornado) 3. Wind gusts 50kts. C. Severe thunderstorms can cause deaths
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 21

ATOC 1050 chapter 5 notes - Chapter 5 Atmospheric Stability...

This preview shows document pages 1 - 5. Sign up to view the full document.

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