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Atmospheric Science
Second Edition
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This is Volume 92 in the
INTERNATIONAL GEOPHYSICS SERIES
A series of monographs and textbooks
Edited by RENATA DMOWSKA, DENNIS HARTMANN, and H. THOMAS ROSSBY
A complete list of books in this series appears at the end of this volume.
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Atmospheric Science
An Introductory Survey
Second Edition
John M. Wallace • Peter V. Hobbs
University of Washington
AMSTERDAM • BOSTON • HEIDELBERG • LONDON
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SAN FRANCISCO • SINGAPORE • SYDNEY • TOKYO
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Cover Photo Credits:
Noboru Nakamura’s drawing, bearing the Latin inscription “Here watch the powerful machine of nature, formed by the air
and other elements”, was inspired by mankind’s long-standing fascination with weather and climate. Some of the products
of this machine are represented by the other images (left to right): annual mean sea surface temperature (courtesy of Todd
Mitchell), a single cell thunderstorm cell over a tropical Pacific atoll (courtesy of Art Rangno), a supercell thunderstorm
over Kansas (courtesy of Chris Kridler), and Antarctic sea ice (courtesy of Miles McPhee).
Library of Congress Cataloging-in-Publication Data
Wallace, John M. (John Michael), 1940–
Atmospheric science : an introductory survey / John M. Wallace,
Peter V. Hobbs.—2nd ed.
p.
cm.
ISBN 0-12-732951-X
1. Atmosphere—Textbooks. 2. Atmospheric physics—Textbooks.
3. Atmospheric chemistry—Textbooks. 4. Meteorology—Textbooks.
I. Hobbs, Peter Victor, 1936–2005 II. Title.
QC861.3.W35 2006
551.5—dc22
British Library Cataloguing-in-Publication Data
A catalogue record for this book is available from the British Library.
ISBN 13: 978-0-12-732951-2
ISBN 10: 0-12-732951-X
2005034642
For information on all Academic Press Publications visit our Web site at www.books.elsevier.com
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In Memory of Peter V. Hobbs (1936–2005)
I am the daughter of Earth and Water,
And the nursling of the Sky;
I pass through the pores of the ocean and shores;
I change, but I cannot die.
For after the rain when with never a stain
The pavilion of Heaven is bare,
And the winds and sunbeams with their convex gleams
Build up the blue dome of air,
I silently laugh at my own cenotaph,
And out of the caverns of rain,
Like a child from the womb, like a ghost from the tomb,
I arise and unbuild it again.
PERCY BYSSHE SHELLEY
The Cloud
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Contents
Preface to the Second Edition
Preface to the First Edition
1 Introduction and Overview
1.1 Scope of the Subject and
Recent Highlights
1.2 Some Definitions and Terms of
Reference
1.3 A Brief Survey of the Atmosphere
1.3.1 Optical Properties
1.3.2 Mass
1.3.3 Chemical Composition
1.3.4 Vertical structure
1.3.5 Winds
1.3.6 Precipitation
1.4 What’s Next?
Exercises
2 The Earth System
2.1 Components of the Earth System
2.1.1 The Oceans
2.1.2 The Cryosphere
2.1.3 The Terrestrial Biosphere
2.1.4 The Earth’s Crust and Mantle
2.1.5 Roles of Various Components
of the Earth System in Climate
2.2 The Hydrologic Cycle
2.3 The Carbon Cycle
2.3.1 Carbon in the Atmosphere
2.3.2 Carbon in the Biosphere
2.3.3 Carbon in the Oceans
2.3.4 Carbon in the Earth’s Crust
2.4 Oxygen in the Earth System
2.4.1 Sources of Free Oxygen
2.5 A Brief History of Climate and the
Earth System
2.5.1 Formation and Evolution of the
Earth System
2.5.2 The Past 100 Million Years
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2.5.3 The Past Million Years
2.5.4 The Past 20,000 Years
2.6 Earth: The Habitable Planet
Exercises
3 Atmospheric Thermodynamics
3.1 Gas Laws
3.1.1 Virtual Temperature
3.2 The Hydrostatic Equation
3.2.1 Geopotential
3.2.2 Scale Height and the Hypsometric
Equation
3.2.3 Thickness and Heights of Constant
Pressure Surfaces
3.2.4 Reduction of Pressure to Sea Level
3.3 The First Law of Thermodynamics
3.3.1 Joule’s Law
3.3.2 Specific Heats
3.3.3 Enthalpy
3.4 Adiabatic Processes
3.4.1 Concept of an Air Parcel
3.4.2 The Dry Adiabatic Lapse Rate
3.4.3 Potential Temperature
3.4.4 Thermodynamic Diagrams
3.5 Water Vapor in Air
3.5.1 Moisture Parameters
3.5.2 Latent Heats
3.5.3 Saturated Adiabatic and
Pseudoadiabatic Processes
3.5.4 The Saturated Adiabatic Lapse Rate
3.5.5 Equivalent Potential Temperature
and Wet-Bulb Potential Temperature
3.5.6 Normand’s Rule
3.5.7 Net Effects of Ascent Followed
by Descent
3.6 Static Stability
3.6.1 Unsaturated Air
3.6.2 Saturated Air
3.6.3 Conditional and Convective Instability
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