GY 101 - Sept 15 Lecture
GY 101 - Sept 15 Lecture GY 101
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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)