Estuarine CO2 gas transfer kinetics (Corpus Christi Bay, Texas)

dc.contributor.advisorHu, Xinping
dc.contributor.authorClark, Corrie
dc.contributor.committeeMemberAbdulla, Hussain
dc.contributor.committeeMemberFelix, Joseph D.
dc.description.abstractCarbon dioxide (CO2) flux across the air-water interface at a location (27.724˚N, 97.341˚W) in Corpus Christi Bay, a subtropical estuary in northwestern Gulf of Mexico, was studied over the course of five weeks from November 16th to December 13th, 2018. CO2 flux was measured using the eddy covariance technique. In addition, CO2 concentration in both the atmosphere and sea surface was obtained. Gas transfer velocities were then mathematically derived from combination of CO2 flux measurements and concentration differences. Gas transfer velocity was modeled as a function of wind speed. Corpus Christi Bay was found to be a net sink of CO2 from the atmosphere for the period of study. Average flux was -0.27 μmol m-2 s-1. Small differences in estuarine and atmospheric CO2 concentrations (<100 ppm) were observed during the study period. Due to limited temporal data coverage, it was not possible to make long-term statements about CO2 movement into and out of Corpus Christi Bay from this study. Gas transfer velocity was modeled as a function of wind speed (3.6 m s-1 < U10 < 12.5 m s−1), where k660 = 0.36U103 (R2 = 0.64). At wind speeds below 3.6 m s-1, wind-induced turbulence contributed only 15% to gas transfer as other factors e.g., surfactant contribution and tidal motion, played a dominant role. Overall gas velocity was high (with a mean k660 of 146 cm hr-1), with average values approximately 10 times those found in other estuarine studies. Bottom-driven turbulence caused by low water depth at the study site in addition to high average wind speeds may have caused the large gas transfer velocities.en_US
dc.description.collegeCollege of Science and Engineeringen_US
dc.description.departmentPhysical and Environmental Sciencesen_US
dc.format.extent70 pagesen_US
dc.rightsThis material is made available for use in research, teaching, and private study, pursuant to U.S. Copyright law. The user assumes full responsibility for any use of the materials, including but not limited to, infringement of copyright and publication rights of reproduced materials. Any materials used should be fully credited with its source. All rights are reserved and retained regardless of current or future development or laws that may apply to fair use standards. Permission for publication of this material, in part or in full, must be secured with the author and/or publisher.en_US
dc.titleEstuarine CO2 gas transfer kinetics (Corpus Christi Bay, Texas)en_US
dc.type.genreThesisen_US A & M University--Corpus Christien_US of Scienceen_US


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