California Basin Study (CaBS) is a multi-institutional, multidisciplinary project funded by the Ecological Sciences Division of the U.S. Department of Energy to study processes that control cycling and vertical transport of energy-related materials off the southern California coast. This region is heavily used for such human activities as oil drilling and transport, shipping, electricity generation by nuclear and fossil fuel plants, and disposal of municipal sewage. CaBS emphasis has been on particle transport and transformation and has focused on the Santa Monica and San Pedro basins, immediately offshore of Los Angeles. Earlier work in the Southern California area has been summarized by Eppley [1986].