Year of Award
2013
Document Type
Dissertation
Degree Type
Doctor of Philosophy (PhD)
Degree Name
Chemistry
Department or School/College
Department of Chemistry and Biochemistry
Committee Chair
Christopher Palmer
Commitee Members
Michael DeGrandpre, Klara Briknarova, Burke Hales, Garon Smith
Publisher
University of Montana
Abstract
Submersible Autonomous Moored Instruments for pH and pCO2 (SAMI-pH and SAMI-CO2) were deployed in a coastal upwelling zone on the Oregon Coast to collect unique multi-season, multi-year datasets of carbonate system dynamics. This is the first long-term deployment of the SAMI-pH paired with a SAMI-CO2. The objectives of this study included (1) improving the accuracy of the SAMI-pH (2) assessing the performance of using paired SAMI-pH and SAMI-CO2 measurements to calculate other carbonate system parameters and (3) analyzing the data to better understand the seasonal, inter-annual, and upwelling variation in the coastal marine carbonate system. SAMI-pH accuracy was improved by better characterization of the pH indicator used in these spectrophotometric measurements. Using paired SAMI-pH and SAMI-CO2 measurements from this study to calculate calcium carbonate saturation states (Ω) occasionally induced significant offsets in the results and so should be used with caution. However, a salinity-derived alkalinity for the region was found to calculate more accurate Ω when paired with either SAMI-pH or SAMI-CO2 measurements. This unique, long-term, high temporal resolution dataset (collected over a period of five years) was used to characterize the carbonate system dynamics in this coastal upwelling zone. Large, fast changes in Ω (>3.0) occurred over a period of a few days and aragonite saturation state (ΩAr) decreased to undersaturation (ΩAr
Recommended Citation
Harris, Katherine Elizabeth, "Applications of Autonomous pH and pCO2 Sensors to Study Inorganic Carbon Dynamics in a Coastal Upwelling System" (2013). Graduate Student Theses, Dissertations, & Professional Papers. 10867.
https://scholarworks.umt.edu/etd/10867
© Copyright 2013 Katherine Elizabeth Harris