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September 2 - September 22 2005 The fifth ECOHAB Pacific Northwest cruise took place in September 2005 aboard the R/V Melville. The Melville left Seattle at 10:06 AM PDT September 2 and returned to Seattle at 10:00 AM September 22. The chief scientist was Barbara Hickey
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The ECOHAB-PNW 5 cruise has provided an important contrast to the 2003 and 2004 fall cruises: diatoms of the Pseudo-nitzschia (PN) genus were relatively rare in the eddy, but were present in large numbers along the southern Washington coast. The cruise took place during a summer with anomalously late onset of upwelling-favorable winds (mid August). On our July cruise, our research team was able to measure the system in the reduced upwelling state. We were also able to follow its recovery in a strong, persistent upwelling period that lasted for ~2 weeks of the cruise period. We demonstrated furthermore that although local upwelling had not begun, the larger scale density field that is responsible for the shelf edge jet had upwelled, possibly due to remote forcing.