Graduate Thesis Or Dissertation
 

Chemistry and hydrography of Oregon coastal waters and the Willamette and Columbia Rivers : March and June, 1971

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  • An inexpensive method for calibrating an infrared analyzer to measure varying ranges of carbon dioxide partial pressures (Pco₂) is described. A discussion is made of the hydrographic (temperature, salinity, and sigma-t) and chemical (dissolved oxygen, AOU, Pco₂ pH, and nutrients) variables that were observed along the Newport hydrographic line in March and June 1971. A winter storm in late March led to an inshore feature of doming isolines. Indications of early seasonal upwelling and photosynthesis were also observed. June conditions were characterized by a deteriorated upwelling regime and an inshore phytoplankton bloom. The Columbia River plume was also driven abnormally close (65 kilometers) to shore by southwesterly winds. Chemical variables as observed in the Columbia and Willamette Rivers in June, 1971 are compared to data from a study made in December, 1968. A large gradient in Pco₂ and temperature is observed in the Willamette River approximately 3.5 kilometers upstream from the confluence in June, but not in December. This observation is related to the seasonal flow patterns of the two rivers. Chemical variables in the Columbia River are influenced by seasonal phytoplankton activity, but oxidation of organic matter is the predominating factor in the Willamette River. Pco₂ values calculated from pH and alkalinity measurements agreed to ± 5 percent with directly measured Pco₂ values in the Columbia River.
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