Preface / Deep-Sea Research II, Volume 45 (1998)
Abstract
Ecosystems of the eastern boundary regions of the ocean basins, like those off
California, Northwest Africa and Peru, are known for enhanced primary production
and resulting large clupeid fisheries. In these eastern boundary regions, the basin-scale
circulation brings the thermocline, pycnocline and nutricline close to the surface and
often in contact with the mixed layer. Processes such as coastal upwelling then act to
bring these cool and nutrient-rich waters to the surface. Photosynthesis is stimulated
by the enhanced nutrient supply to sunlit waters, and food for supporting the
ecosystem is generated. The source and fate of this primary production is variable,
reflecting the dynamic physical character of eastern boundary systems. The physical
and biological variability are most notable on mesoscale or subseasonal (upwelling
events, jets and eddies), seasonal (spring transition, upwelling, winter) and interannual
(El Nifio) scales. Decadal and interdecadal oscillations are evident in the longer time
series (Hayward, 1996; Ingraham Jr. et al., 1998) and the analysis of White et al. (1997)
suggests that the Northeast Pacific, and the California Coast in particular, are regions
of higher than average decadal and interdecadal variability. And of course, the
shadow of global warming looms on the horizon, if not already underway. Considering
these factors, and the planning and implementation of major multi-disciplinary
programs along the West Coast of North America (GLOBEC, CoOP), we have
assembled a series of papers dealing with the oceanography of California waters into
a volume of Deep Sea Research II.
Rights
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