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Ocean-Atmosphere Carbon Exchange Study

Project Description
The Ocean-Atmosphere Carbon Exchange Study (OACES) of NOAA's Climate and Global Change (C&GC) Program has two major scientific objectives. The first is to carry out high- quality measurements of carbon dioxide (CO 2) system parameters that can be used to document the transient invasion of fossil fuel derived CO 2 into the ocean's interior. The second is to utilize these observations in ocean and atmosphere general circulation models to enable more accurate predictions of future climate change on decadal to centennial timescales. In support of these objectives, the OACES program has been making carbon system measurements on deep ocean survey cruises as well as time-series measurements of atmospheric l2CO 2 and 13CO 2 at NOAA's global cooperative flask sampling network sites.

Program Interfaces:
The OACES program addresses research relevant to the goals of the U.S. Joint Global Ocean Flux Study (U.S. JGOFS), a core activity of the International Geosphere- Biosphere Programme (IGBP). OACES research is also relevant to activities of the International Global Atmospheric Chemistry (IGAC) program, also of IGBP. The IGAC program includes global measurements and modeling of atmospheric CO 2 and its isotopic composition. With respect to NASA, the oceanic measurements made along meridional ocean sections and process study cruises supported by OACES will provide valuable information to the NASA SeaWIFS Ocean Color Satellite mission, namely in situ ocean data that can be used to validate information derived from the satellite (i.e., &ground-truthing&). Another partner in the quest to understand the global carbon cycle is the U.S. Department of Energy (DOE). In addition to supporting CO 2 measurements on World Ocean Circulation Experiment (WOCE) cruises, DOE is providing certified seawater reference materials to investigators to ensure the analytical quality control of seawater total CO 2 measurements.

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