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Geography 1.28.16

by: Tizhana Turner

Geography 1.28.16 Geog 1112

Tizhana Turner

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About this Document

These notes go over what was covered on that day
Intro to weather and climate
Zaina Qureshi, Lashonda J. Williams
Class Notes
25 ?




Popular in Intro to weather and climate

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This 2 page Class Notes was uploaded by Tizhana Turner on Friday January 29, 2016. The Class Notes belongs to Geog 1112 at Georgia State University taught by Zaina Qureshi, Lashonda J. Williams in Fall 2015. Since its upload, it has received 20 views. For similar materials see Intro to weather and climate in Geography at Georgia State University.


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Date Created: 01/29/16
Geography 1.28.16 What’s going on with the weather today?  Any clouds?  What do they look like­Wispy, lumpy, or sheety? Sheety  Temperature­ Warm or Cold? Cold outside today  Is it humid? No  Any precipitation: not much  Is it windy? Not really Low and High Pressure System  Low pressure systems bring rain  High pressure systems bring sunny skies < Chapter 4: Atmosphere and Surface Energy Balances> What is Energy?  Energy: the capacity to do work ( move stuff around)  Potential energy: stored energy (ex: going up the roller coaster <the buildup>)  Kinetic energy: energy of motion ( ex: going down really fast on the roller coaster) Heat Energy  Heat: flow of energy.  Types of heat energy:   ­­ Sensible heat: “sensed” as temperature ( being able to feel the heat)  ­­ Latent heat: released or absorbed when water changes phase Methods of Heat Transfer  Radiation: travels through air/space  Convection: travels in a vertical movement.  Conduction: molecule­to­molecule transfer  Advection: travels in a horizontal movement. *Review the Electromagnetic Spectrum*  Shortwave energy comes from the sun  Longwave comes from the Earth Energy Laws (not in your book)  Stefan­ Boltzmann Law: everything with a temperature puts out energy.  Two objects: ­T1 = 200K (cold) or –T2 =400K (hot)  How much more energy does 2 put out vs. 1  Hotter objects put in way more energy than cold objects.  Wien’s Law:  wavelength at which objects put out the most energy is related to the  temperature.  Sun: T= 5800K (very hot)  Human body: T= 290K ( much cooler)  Which object peaks in visible light, and which in infrared?  Hotter objects peak at shorter energy wavelengths  Wien’s Law: explains why the sun glows, but earth does not.  Size of energy curves explained by Stefan­Boltzmann Law. Transmission and Absorption  Transmission: Energy passes uninterrupted trough atmosphere  Absorption: Energy absorbed by the atmosphere ( or surface)  Selective absorption ( ex: ozone absorbs ultraviolet) Reflection and Albedo  Reflection: Energy bounces back at same wavelength  Albedo: % of incoming light that is reflected  Light objects: high albedo; dark objects: low albedo  Average for Earth: 31% ; fresh snow: 90% Scattering  Scattering: energy being sent off in multiple directions.  Rayleigh scattering: small particulates.  Mie scattering: large particulates. Refraction  Change in speed and/or direction (bending) of light as light passes from one medium to  another.  Ex: mirage Rainbows  Light is reflected and refracted through raindrops.


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