AS101 Lecture 21

AS101 Lecture 21 - AS101 Lecture 21 Logistics: • Night...

Info iconThis preview shows pages 1–15. Sign up to view the full content.

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: AS101 Lecture 21 Logistics: • Night Lab: Last Lecture: • Atmosphere of terrestrial planets Today’s Lecture: • Atmosphere of terrestrial planets (contd.) • Jovian planets Time out to think question A closed car becomes hotter than the surrounding air primarily because 1. energy enters from solar heating but cannot escape via conduction 2. energy enters from solar heating but cannot escape via convection. 3. energy enters from solar heating but cannot escape via radiation. 4. energy enters through conduction but cannot escape via radiation 5. energy enters through convection but cannot escape via conduction Planetary Atmospheres CO 2 increase on Earth CO 2 levels from ice cores for past 1MYr E. Wolff, et. al., Modeling Past Atmospheric CO 2 , EOS, Sept 20, 2005 Ozone chemistry creates the stratosphere Sunlight creates and Destroys Ozone, O 3 Blocks Ultraviolet light Stratosphere has no convection! Slows loss of material from Troposphere Ozone Depletion 1979 1998 Atmospheric Dynamics Global Wind Patterns Global winds blow in distinctive patterns • Equatorial: E to W • Mid-latitudes: W to E • High-latitudes: E to W Max Peskin: What causes such wind pattern? Circulation Cells: No Rotation Heated air rises at equator Cooler air descends at poles Without rotation, these motions would produce two large circulation cells Atmospheric motions: Winds Temperature Gradients cause wind flows and vertical convection The Coreolis effect causes circulation counterclockwise in the northern hemisphere clockwise in the southern hemisphere Circulation Cells with Rotation Coriolis effect deflects north- south winds into east-west winds Deflection breaks each of the two large “no-rotation” cells breaks into three smaller cells Prevailing Winds Prevailing surface winds at mid-latitudes blow from W to E because Coriolis effect deflects S to N surface flow of mid- latitude circulation cell Earth’s Magnetosphere...
View Full Document

This note was uploaded on 04/14/2011 for the course ASTRO 101 taught by Professor Oppenheim during the Spring '11 term at BU.

Page1 / 42

AS101 Lecture 21 - AS101 Lecture 21 Logistics: • Night...

This preview shows document pages 1 - 15. Sign up to view the full document.

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