Theses and Dissertations

Date of Award

12-2019

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Ocean, Coastal, and Earth Sciences

First Advisor

Dr. John Breier

Second Advisor

Dr. David Hicks

Third Advisor

Dr. Owen Temby

Abstract

Dissolved oxygen is an essential parameter necessary for understanding marine ecological and biogeochemical processes. New robotic vehicles and autonomous platforms are being applied to an even wider range of ecological and biogeochemical studies. Thus, arises the opportunity for matching the best possible oxygen sensing techniques and methods to these new platforms. In so doing, we can enable both more targeted and higher resolution oxygen measurements than previously possible and potentially use oxygen measurements for a wider range of applications, including in situ incubation experiments and primary productivity measurements. This thesis tested three different oxygen sensors in a trade study for stability, accuracy, precision, drift and detection limits. This thesis also conducted an iron oxidation field application study in order to fully understand the obstacles and difficulties that occur when utilizing and deploying oxygen sensors. The iron oxidation field study determined an average dissolved iron half life of approximately 4.2 hrs. The kinetic rate of iron oxidation at Lo’ihi was then compared to other known sites. The comparison revealed Lo’ihi to have a slower oxidation rate than most other sites. This is likely due to the fact that Lo’ihi is located in the oxygen minimum zone.

Comments

Copyright 2019 Brianna A. Alanis. All Rights Reserved.

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