Preface to special section on enhanced Subarctic influence in the California Current, 2002

Details Preface to special section on enhanced Subarctic influence in the California Current, 2002 Preface to special section on enhanced Subarctic influence in the California Current, 2002

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30occr1h&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 15, pp. CCR 1-1, CiteID 8019, DOI 10.1029/2003GL017724

Physics

11

Oceanography: General: Climate And Interannual Variability (3309), Oceanography: Physical: Eastern Boundary Currents, Oceanography: General: Descriptive And Regional Oceanography, Oceanography: General: Water Masses, Oceanography: General: Upwelling And Convergences

Scientific paper

This special section discusses a rare phenomenon: strong enhancement of Subarctic influence in the California Current system in the summer of 2002. This cold, fresh anomaly in the upper halocline was more extreme than any prior observation, though historical records extend back for several decades. The Subarctic anomaly extended more than 1500 km along the U. S. west coast, from 49°N to 33°N. It brought high-nutrient waters into the coastal upwelling zone off Oregon and northern California, and produced exceptionally high chlorophyll concentrations. Inner shelf oxygen concentrations were very high near the surface and very low near the bottom. The presence of this Subarctic water mass was associated with anomalous southward currents detected by three different methods: by satellite-tracked drifters, a mid-shelf mooring, and by satellite altimetry. Large-scale wind forcing over the northeastern Pacific during the previous winter and spring seems to be responsible for these anomalies.

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