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GY 101 - Sept 15 Lecture

by: Savannah L

GY 101 - Sept 15 Lecture GY 101

Savannah L

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Thursday, September 15, 2016 Lecture Notes - Atmospheric Pressure and Wind
Atmospheric Proc & Patterns
Professor Douglas Sherman
Class Notes
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This 3 page Class Notes was uploaded by Savannah L on Thursday September 15, 2016. The Class Notes belongs to GY 101 at University of Alabama - Tuscaloosa taught by Professor Douglas Sherman in Fall 2016. Since its upload, it has received 23 views. For similar materials see Atmospheric Proc & Patterns in Geography at University of Alabama - Tuscaloosa.

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Date Created: 09/15/16
GY 101 – SEPT 15 LECTURE ATMOSPHERIC PRESSURE AND WIND Global “Surfaces”  Water  Sand (relatively high albedo, low specific heat)  Ice/snow (very high albedo, most radiation reflected, high conductivity, highest specific heat, most ice: temperatures become relatively stable)  Vegetation (relatively low albedo, absorbs radiation, intermediate conductivity, moderate specific heat) Thermal Properties of Surfaces:  Cause differential heating of the Earth’s surface  Cause temperature gradients, thus pressure gradients o Pressure gradients drive the wind  Drive wind systems across a number of scales Effects of Fluid Density on Flow  For unconfined air, density changes with temperature (Ideal Gas Law)  T up, p down  T down, p up  Air pressure changes with density  Temperature has an inverse relationship with density  Air will flow to equalize pressure o Hot air will rise, cold air will sink (cold air will flow toward location ofwarmer air, causing circulation) NOTE:When talking about warm and cold, we’re talking about relative differences. Doesn’t necessarily mean Object A is “warm”, but instead Object A is warm relative to Object B, or vice versa. For diagrams:  (H) means “high pressure”  (L) means “low pressure”  (W) means “warm”  (C) means “cool” VERTICAL AIR [SNOW] [PARKING GARAGE] [SNOW] Land Breeze: High pressure moves from land to sea (relatively warming the sea) NOTE: almost always weaker than the sea breeze Sea Breeze: Low pressure moves from sea to land  Pressure gradient ONLY REFERS to horizontal pressures  Equator has Low Pressure The Distribution of Pressure:  Pressure maps depict isobars, or lines of equal pressure  Pressure gradients depict the rate of change in pressure, they are apparent on maps by the spacing between the isobars o Closer: rate of change in pressure is faster o Farther: rate of change in pressure is slower o Winds are driven from H to L Coriolis Force: objects in the atmosphere are influenced by earth’s rotation NOTE:Conservationof Angular Momentum Coriolis has objects to appear to be pathing left of travel in the Southern Hemisphere, right in the Northern Hemisphere DIAGRAMS  Equalizing Pressure (High v. Low)


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