The Borderland Basins off Southern California aresemi-isolated sea-floor depressions with connections to each otherand to the open Pacific Ocean over narrow sills. A high-resolution,multi-year simulation is analyzed for its currents, stratification,and dissolved oxygen, with a focus on the mean conditions, intrinsicvariability, and exchange rates with surrounding waters. The threeshallowest, closest basins are given the most attention: SantaBarbara, Santa Monica, and San Pedro. From a combination ofmultiple means of estimation, the deep basin water mass renewaltimes are on the order of a year or more, and this time is somewhatshorter in the Santa Barbara Basin than the others.
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McWilliams et al. (2024) studied this question.
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