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

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  • 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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  • Pierce, S. D., Barth, J. A., Thomas, R. E. and Fleischer, G. W., 2006, Anomalously warm July 2005 in the northern California Current: Historical context and the significance of cumulative wind stress: Geophys. Res. Lett., v. 33, L22S04.
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  • description.provenance : Approved for entry into archive by Linda Kathman(linda.kathman@oregonstate.edu) on 2010-04-15T21:35:30Z (GMT) No. of bitstreams: 1 Pierce et al GRL 2006.pdf: 497311 bytes, checksum: 61a33b033c6c89d2d1fda78e933a8690 (MD5)
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