Anomalously warm July 2005 in the northern California Current: Historical context and the significance of cumulative wind stress

Details Anomalously warm July 2005 in the northern California Current: Historical context and the significance of cumulative wind stress Anomalously warm July 2005 in the northern California Current: Historical context and the significance of cumulative wind stress

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3322s04p&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 22, CiteID L22S04

Physics

11

Oceanography: General: Descriptive And Regional Oceanography, Oceanography: General: Upwelling And Convergences (4964), Oceanography: Physical: Currents, Oceanography: Physical: Eastern Boundary Currents

Scientific paper

In the northern California Current, the onset of the 2005 upwelling season was five weeks later than usual, and well-established upwelling with a cold surface signature did not occur until about seven weeks after this. As part of the joint US-Canada Pacific hake survey, from 14-16 July 2005 we occupied the Newport Hydrographic line at 44.65°N, from the Oregon coast to 83 km offshore. Instead of the cold surface layer expected in July, we observed anomalously warm water. For example, 10-m temperature at the shelf station NH-5 was the warmest ever recorded in July at this location: 6.2°C above average, with observations back to 1961. We explore the pivotal role played by cumulative (time-integrated) wind forcing in the development of upwelling, in both 2005 and previous years. We find that 80% of July surface layer (0-30 m) interannual temperature variance can be explained by cumulative upwelling index from the spring transition.

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