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Lecture 2: Global Energy Balance

by: Alexandra

Lecture 2: Global Energy Balance GR4990

Marketplace > Mississippi State University > geosciences > GR4990 > Lecture 2 Global Energy Balance
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About this Document

Talks about the Global Energy Balance
Physical Climatology
Dr. Fuhrmann
Class Notes
Climatology, climate change, climate




Popular in Physical Climatology

Popular in geosciences

This 2 page Class Notes was uploaded by Alexandra on Saturday September 24, 2016. The Class Notes belongs to GR4990 at Mississippi State University taught by Dr. Fuhrmann in Fall 2016. Since its upload, it has received 7 views. For similar materials see Physical Climatology in geosciences at Mississippi State University.


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Date Created: 09/24/16
Lecture 2: Global Energy Balance  Energy in the climate system  Global Energy Balance  Temp is measure of energy contained in movement of molecules  Energy coming in from sun (solar radiation) and returned to space from Earth (terrestrial radiation)  Most of SR absorption occurs at Earth’s surface. Most of TR absorption occurs in Earth’s atmosphere.  Solar System  Photosphere and luminosity  Total rate at which solar energy is released  Sun’s luminosity has increased ~30% over Earth’s life  Orbital Parameters  Mean planet-sun distance controls solar irradiance. Solar energy delivered per unit area per unit time (flux)  Eccentricity  Orbit closer to 0  Perihelion  Aphelion  Orientation of orbital plane  Planetary Rotation and Orbit  Rate of rotation of planet on diurnal scales  Obliquity (tilt)  Heat Transport  Radiation-no mass exchange, no medium  Sun → Earth  Convection-mass exchanged, air parcels w/ diff. amounts of energy change places so energy is exchanged w/o mass movement  Thunderstorms  Emission Temperature  Temperature needed to achieve energy balance  Solar radiation absorbed = radiation emitted  Amount of absorbed radiation is a function of:  Total solar irradiance  Planetary albedo  Radius of planet  TSI (Total Solar Irradiance)-near constant flux of energy from the sun arriving at a planet at the top of the atmosphere (TOA)  Planetary albedo ~30%  Emission Temperature of Earth 4 ????????(1−????????)  ????????= √ 4???? *same as global energy balance* 2  ???????????????????????? − ???????????????????????????????????? ????????????????????????????????: σ ???? ( ) 4 ∗ 4???????? ???? ???????? ???????? ????????ℎ????????????  Stefan-Boltzmann = Energy emitted by earth  σ = constant  Energy absorbed by Earth: ???????? ???? ∗ ????(1 − ????)  ???????? ???? = Earth’s area  S = solar flux  A = albedo  Global energy balance  ???????? 4 = (1 − ????) ???? 4  Emission temp of Earth ~255K (0⁰F)  Inverse square law: as distance increases, solar flux decreases


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