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

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Field Value
Title Anomalously warm July 2005 in the northern California Current : historical context and the significance of cumulative wind stress
Names Pierce, Stephen D. (creator)
Barth, John A. (creator)
Thomas, Rebecca E. (creator)
Fleischer, Guy W. (creator)
Date Issued 2006 (iso8601)
Note copyrighted by American Geophysical Union
Abstract 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.
Genre Article
Identifier 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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