Show simple item record

dc.contributor.advisorRamírez-Martínez, Wilson R.
dc.contributor.authorJiménez-Arroyo, Ángel L.
dc.date.accessioned2019-05-06T17:42:37Z
dc.date.available2019-05-06T17:42:37Z
dc.date.issued2018-05en_US
dc.identifier.urihttps://hdl.handle.net/20.500.11801/2123
dc.description.abstractPrevious studies suggest that recent global temperature rise has been driven by both anthropogenic activity and natural variability. The study of pre-historic climate change without anthropogenic influences should place natural climate variability into context. The focus of this study is to interpret tropical Sea Surface Temperature (SST) based on measured Sr/Ca ratios, through the Holocene from ~9.0 K ± 200 - 5.6 K ± 29 ybp from five (5) fossil Orbicella complex sp. corals collected from different facies in a well-preserved reef (Cañada Honda) located on the slopes of Enriquillo Lake Valley, Dominican Republic. A Sr/Ca-Temperature calibration curve was developed using a modern Orbicella complex sp. coral from Barahona Bay, ~70 Km from the fossil Cañada Honda Reef. Temperatures derived from previous Sr/Ca data sets were re-calculated with our equation. Coral growth rates based on measurements from radiographs indicate slow growth of fossil corals (1.32 - 1.98 mm/year, n=5) relative to the modern Barahona location coral that show a growth rate of 7.34 mm/year. U-Th analyses indicate a mid-Holocene for the age corals (8,365 ± 25 - 5,690 ± 29 ybp, n=5). Original aragonite mineralogy of the coral skeleton (i.e. no neomorphism to calcite) was corroborated by XRD analyses. The resulting Sr/Ca-Temperature calibration equation is Sr/Ca = -0.0676*SST + 10.7867. The SST average values obtained were 27.8 ± 1.1 (°C) for modern coral, (18.79 ± 1.2 to 26.86 ± 2.0 °C) for fossil corals, and they provide snapshots of SST for early to mid-Holocene ages.en_US
dc.description.abstractEstudios previos sugieren que el reciente aumento global de la temperatura ha sido impulsado tanto por la actividad antropogénica como por la variabilidad natural. El estudio del cambio climático prehistórico sin influencias antropogénicas debe ubicar la variabilidad climática natural en su contexto. El objetivo de este estudio es interpretar la temperatura superficial del mar tropical (SST) basada en relaciones medidas de Sr / Ca, a través del Holoceno desde ~ 9,0 K ± 200 - 5,6 K ± 29 ybp de cinco (5) fósiles del complejo Orbicella sp. corales recolectados de diferentes facies en un arrecife bien conservado (Canadá Honda) ubicado en las laderas del Valle del Lago Enriquillo, República Dominicana. Se desarrolló una curva de calibración Sr / Ca-Temperature usando un complejo moderno de Orbicella sp. coral de la bahía de Barahona, a unos 70 km del fósil Cañada Honda Reef. Las temperaturas derivadas de los conjuntos de datos anteriores Sr / Ca se recalcularon con nuestra ecuación. Las tasas de crecimiento de corales basadas en mediciones de radiografías indican crecimiento lento de corales fósiles (1.32 - 1.98 mm / año, n = 5) en relación con la moderna ubicación de coral Barahona que muestra una tasa de crecimiento de 7.34 mm / año. Los análisis U-Th indican un Holoceno medio para los corales de edad (8.365 ± 25 - 5.690 ± 29 ybp, n = 5). La mineralogía de aragonita original del esqueleto coralino (es decir, no neomorfismo a la calcita) fue corroborada por análisis XRD. La ecuación de calibración de Sr / Ca-temperatura resultante es Sr / Ca = -0.0676 * SST + 10.7867. Los valores promedio de SST obtenidos fueron 27.8 ± 1.1 (° C) para los corales modernos (18.79 ± 1.2 a 26.86 ± 2.0 ° C) para los corales fósiles, y proporcionan instantáneas de SST para edades tempranas a medias del Holoceno.en_US
dc.description.sponsorshipGeological Survey (USGS) St. Petersburg, Florida; Extramural Research Experience Award -Transformational Initiative for Graduate Education and Research (EREA-TIGER) at University of Puerto Rico, Mayagüez Campus (Department of Education, Title V Part B, Promoting Postbaccalaureate Opportunities for Hispanic Americans Program (PPOHA) under Award # P031M140035; Rosenstiel School of Marine and Atmospheric Science; San Antonio Hospital Mayagüezen_US
dc.language.isoenen_US
dc.subjectOcean temperature - Reconstruction - Corals, Fossils - Caribbeanen_US
dc.subjectPaleoceanography--Holocene - Enriquillo Lake Valley (Dominican Republic)en_US
dc.subjectPaleoclimatology--Holocene - Enriquillo Lake Valley (Dominican Republic)en_US
dc.subject.lcshGeology, Stratigraphic -- Holoceneen_US
dc.subject.lcshOcean temperatureen_US
dc.subject.lcshGlobal temperature changesen_US
dc.subject.lcshCorals, Fossil -- Caribbean Areaen_US
dc.subject.lcshCorals -- Dominican Republicen_US
dc.titleSea surface temperature reconstruction (Sr/Ca) from modern and fossil Caribbean holocene coralsen_US
dc.typeThesisen_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(c) 2018 Ángel L. Jiménez Arroyoen_US
dc.contributor.committeeSantos, Hernán
dc.contributor.committeeHughes, Stephen
dc.contributor.committeeRodríguez, Lizzette
dc.contributor.representativeArcelay, Enid
thesis.degree.levelM.S.en_US
thesis.degree.disciplineGeologyen_US
dc.contributor.collegeCollege of Arts and Sciences - Sciencesen_US
dc.contributor.departmentDepartment of Geologyen_US
dc.description.graduationSemesterSpringen_US
dc.description.graduationYear2018en_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

  • Theses & Dissertations
    Items included under this collection are theses, dissertations, and project reports submitted as a requirement for completing a graduate degree at UPR-Mayagüez.

Show simple item record

All rights reserved
Except where otherwise noted, this item's license is described as All Rights Reserved