[Eoas-seminar] Emily Daily - Honor's in the Major Defense

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Wed Apr 10 13:55:16 EDT 2019

Honors in the Major Defense

Emily Dailey

B.S. Environmental Science Candidate

Title:  Setting a baseline: interannual variability of carbonate parameters in the western South Pacific

Major Professor:  Dr. Mariana Fuentes

Date: April 17th, 2019                      Time: 10 AM

Location: OSB 433


Surface water samples collected in the western South Pacific Ocean in the austral fall of 2015, 2016, 2017, and 2018, were used to characterize the variability of carbonate parameters in the region and to identify mechanisms that may have impacted these parameters over interannual timescales. The South Pacific Subtropical Gyre stayed fairly constant with regard to its carbonate parameters over 2015-2018. The Chatham Rise and Subtropical Front regions to the east of New Zealand experienced slight increases in temperature and pH over the entire period. Between 2015 and 2016, and between 2017 and 2018, there were significant decreases in total alkalinity. Calcite and aragonite saturation state were also evaluated and were found to increase over the four-year study period. Based on sensitivity test study results, changes in pH and total alkalinity impacted calcite and aragonite state most significantly. Therefore, we hypothesize that there was a large amount of NO3—supported photosynthesis by calcifying phytoplankton, specifically, the coccolith, E. Huxleyi, a species prolific in this region.

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