The Coordinated Enhanced Observing Period (CEOP) is an international project that was first proposed by the Global Energy and Water Cycle Experiment (GEWEX) in 1997 and was formally launched in 2001. Since that time it has been adopted by the World Climate Research Programme (WCRP), which views it as an essential part of its strategy for developing global datasets to evaluate global climate models, and by the Integrated Global Observing Strategy Partnership (IGOS-P), which views it as the first element of its global water cycle theme. The United States has been an active partner in all phases of CEOP. In particular, the United States has taken the lead in contributing data from a number of reference sites, providing data processing, and archiving capabilities and related research activities through the GEWEX Americas Prediction Project (GAPP). Other U.S. programs and agencies are providing components including model and data assimilation output, satellite data, and other services. The U.S. science community has also been using the CEOP database in model evaluation and phenomenological studies. This article summarizes the U.S. contributions during the first phase of CEOP and outlines opportunities for readers to become involved in the data analysis phase of the project.

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International GEWEX Project Office, Silver Spring, Maryland

NASA, Greenbelt, Maryland

The University of Arizona, Tucson, Arizona

CEOP International Project Office, San Diego, California

Indiana University, Bloomington, Indiana

University of Maryland, College Park, College Park, Maryland

George Mason University, Fairfax, Virginia

University of California, Irvine, Irvine, California

NOAA, Silver Spring, Maryland

NOAA, Oak Ridge, Tennessee

NOAA, Camp Springs, Maryland

Scripps Institution of Oceanography, La Jolla, California

NCAR, Boulder, Colorado