Lecture4_EAS1600_Fall08 - EAS 1600 Introduction to...

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EAS 1600 Introduction to Environmental Sciences Lecture 4 Feedbacks and Equilibria We now begin our discussion of the first major topic- area of the course: The Earth as a System
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Equilibrium States vs. States of Environmental Change Figure 2.4 in the textbook illustrates the variation in the Earth's globally averaged temperature over the past ~ 100 years; what modes of environmental change do you see in this record and on what time scales do they operate? Do you see any evidence for the existence of equilibrium states or pseudo-equilibrium states?
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STATES OF EQULIBRIUM There are actually two-types of equilibrium states: stable and unstable. Taken from Kump, L.R., J.F. Kasting, R.G. Crane, The Earth System , Prentice Hall, Upper Saddle River, NJ, 351 pp, 1999.
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We can think of environmental change as occurring in one of 4 modes: Mode 1. Persistent or secular change occurs in one direction Taken from Hidore, J.J., Global Environmental Change , Prentice Hall, Upper Saddle River, NJ, 263 pp, 1996.
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Modes of Environmental Change (Cont’d) An example: the slow decrease in Earth's rotation about its axis (and corresponding increase in length of day) due to the lunar tidal attraction. Taken from Hidore, J.J., Global Environmental Change , Prentice Hall, Upper Saddle River, NJ, 263 pp, 1996.
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Modes of Environmental Change (Cont’d) Mode 2. Periodic (or rhythmic) change follows a
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This note was uploaded on 02/08/2011 for the course EAS 1600 taught by Professor Jimstjohn during the Fall '08 term at Georgia Institute of Technology.

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Lecture4_EAS1600_Fall08 - EAS 1600 Introduction to...

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