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The Hanna Shoal Ecosystem Study is a multi-disciplinary investigation to examine the biological, chemical and physical properties that define this ecosystem. The study extends the monitoring initiated under the COMIDA CAB program, in which over 70 stations were occupied in the northern Chukchi Sea with a focus on trophic structure, sediments, inventories of anthropogenic chemicals (trace metals and organics), and inventories of benthic and epibenthic fauna. The Hanna Shoal study adds (1) a pelagic component to address standing stocks of phytoplankton and zooplankton and (2) a physical oceanographic study that addresses water mass movements through direct measurement of circulation, density fields, ice conditions and modeling.