Ocean Acidification: A Critical Emerging Problem for the Ocean Sciences
By Scott C. Doney , William M. Balch, Victoria J. Fabry , and Richard A. Feely

An Accounting of the Observed Increase in Oceanic and Atmospheric CO₂ and an Outlook for the Future
By Pieter Tans

Ocean Acidification: Present Conditions and Future Changes in a High-CO₂ World
By Richard A. Feely, Scott C. Doney , and Sarah R. Cooley

Observing Ocean Acidification from Space
By Dwight K. Gledhill , Rik Wanninkhof , and C. Mark Eakin

Ocean Acidification in the California Current System
By Claudine Hauri , Nicolas Gruber, Gian-Kasper Plattner, Simone Alin, Richard A. Feely, Burke Hales, and Patricia A. Wheeler

Effect of Ocean Acidification on the Speciation of Metals in Seawater
By Frank J. Millero, Ryan Woosley , Benjamin DiTrolio, and Jason Waters

Ocean Acidification and the Increasing Transparency of the Ocean to Low-Frequency Sound
By Peter G. Brewer and Keith Hester

Ocean Acidification in Deep Time
By Lee R. Kump , Timothy J. Bralower , and Andy Ridgwell

Coral Reefs and Ocean Acidification
By Joan A. Kleypas and Kimberly K. Yates

Why Corals Care About Ocean Acidification: Uncovering the Mechanism
By Anne L. Cohen and Michael Holcomb

Nutrient Cycles and Marine Microbes in a CO₂-Enriched Ocean
By David A. Hutchins , Margaret R. Mulholland , and Feixue Fu

Potential Interactions Among Ocean Acidification, Coccolithophores, and the Optical Properties of Seawater
By William M. Balch and Paul E. Utgoff

Ocean Acidification at High Latitudes: The Bellwether
By Victoria J. Fabry , James B. McClintock, Jeremy T. Mathis, and Jacqueline M. Grebmeier

Ocean Acidification's Potential to Alter Global Marine Ecosystem Services
By Sarah R. Cooley, Hauke L. Kite-Powell, and Scott C. Doney

Research Priorities for Understanding Ocean Acidification: Summary From the Second Symposium on the Ocean in a High-CO₂ World
By James C. Orr, Ken Caldeira, Victoria Fabry, Jean-Pierre Gattuso, Peter Haugan , Patrick Lehodey, Silvio Pantoja, Hans-Otto Pörtner , Ulf Riebesell , Tom Trull , Ed Urban , Maria Hood , and Wendy Broadgate

European Project on Ocean Acidification (EPOCA): Objectives, Products, and Scientific Highlights
By Jean-Pierre Gattuso , Lina Hansson , and The EPOCA Consortium

Taking Ocean Research Results to Applications: Examples and Lessons from US GLOBEC
By Elizabeth Turner and Dale B. Haidvogel

Dissolved Organic Matter in the Ocean: A Controversy Stimulates New Insights
By Dennis A. Hansell, Craig A. Carlson , Daniel J. Repeta , and Reiner Schlitzer

Understanding How Disease and Environment Combine to Structure Resistance in Estuarine Bivalve Populations
By Eileen Hofmann, David Bushek, Susan Ford , Ximing Guo , Dale Haidvogel , Dennis Hedgecock , John Klinck, Coren Milbury, Diego Narvaez, Eric Powell , Yongping Wang , Zhiren Wang, John Wilkin , and Liusuo Zhang

FROM THE GUEST EDITORS • From the Guest Editors
By William M. Balch, Scott C. Doney, Victoria J. Fabry , and Richard A. Feely

QUARTERDECK • Making Could Into Something We Can Sell
By Ellen S. Kappel

FROM THE PRESIDENT • A Healthy Ocean Matters
By Carolyn A. Thoroughgood

RIPPLE MARKS • Collision Course: Climate Change, Bears, and Humans in the Land of 10,000 Lakes | Russian Roulette: To Catch a Fish-Owl | Polar Bears' Habitat—and Polar Bears—Shrinking | Rain-on-Snow: New Arctic Killer Fingered
By Cheryl Lyn Dybas

THE OCEANOGRAPHY CLASSROOM • Health and Safety in the Learning Environment
By Simon Boxall

HANDS-ON OCEANOGRAPHY • Sorting Out Sediment Grain Size and Plastic Pollution
By Heather L. Spalding, Kanesa M. Duncan , and Zoe Norcross-Nu’u

AWARDS • The 2009 Walter Munk Award
Awards: The 2009 Walter Munk Award. 2009. Oceanography 22(4):251.

BOOK REVIEW • Estuaries: Dynamics, Mixing, Sedimentation and Morphology
By Alexander Yankovsky

BOOK REVIEW • Oceanology: The True Account of the Voyage of the Nautilus
By Clarice M. Yentsch and Charles S. Yentsch

BOOK REVIEW • Don't Be Such a Scientist: Talking Substance In An Age of Style
By Jonathan H. Sharp

William M. Balch, Bigelow Laboratory for Ocean Sciences
Scott C. Doney, Woods Hole Oceanographic Institution
Victoria J. Fabry, California State University, San Marcos
Richard A. Feely, National Oceanic and Atmospheric Administration

Production of this issue was funded by the National Aeronautics and Space Administration, National Oceanic and Atmospheric Administration, and National Science Foundation.