Physical metrics and O2-S regression statistics during the anchor station (AS) and survey cruises in the Columbia River estuary during 2006–2008.

DOY: day of year. LI: lunar index. S/N: spring/neap cycle. CWS: 4-d cumulative wind stress (N m−2; where negative denotes upwelling, positive is downwelling, and low wind stress ranges from 0.03 to -0.03 N m−2). Smax: maximum observed salinity (psu). O2min: minimum observed oxygen concentration (mg L−1). m: slope of O2min-Smax regression line. r2: variation explained. n: number of observations. All regression equations were significant (P