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dc.contributor.advisorWinter, Amos
dc.contributor.authorEstrella-Martínez, Juan A.
dc.date.accessioned2018-06-06T16:40:22Z
dc.date.available2018-06-06T16:40:22Z
dc.date.issued2013
dc.identifier.urihttps://hdl.handle.net/20.500.11801/734
dc.description.abstractA high-resolution record of the Caribbean mixed layer temperature at different depths derived from oxygen isotopic ratios obtained from the sclerosponge Ceratoporella nicholsoni is presented. Sclerosponges precipitate calcium carbonate skeletons in equilibrium with their surrounding environment and can live at depths down to 200m. The sponges were collected off the coasts of Puerto Rico and St. Croix in northeastern Caribbean Sea. The records obtained extend from the early 1500’s to the present and suggest that the northeastern Caribbean was 1-2°C cooler than present during the Little Ice Age. Wavelet analysis of the sclerosponge records indicate that when the total solar irradiance (TSI) reaches a threshold value of 1365.29Wm-2 there is a coupling of the eleven-year sunspot cycle with the decadal sclerosponge-derived temperature variability. The findings suggest a local temperature response to TSI of 0.62°C(W/m2)-1 for the 20th century, similar to previously published global values of climate solar sensitivity.en_US
dc.description.abstractUn récord de alta resolución de la temperatura de la capa mixta del Caribe a diferentes profundidades derivadas de proporciones isotópicas de oxígeno obtenidos de la escleroesponja Ceratoporella nicholsoni es presentado. Las escleroesponjas precipitan esqueletos de carbonato de calcio en equilibrio con su medio ambiente y pueden vivir a profundidades de hasta 200m. Las esponjas fueron recolectadas en las costas de Puerto Rico y Santa Cruz, en el noreste del Mar Caribe. Los registros obtenidos se extienden desde los años 1500 hasta el presente y sugieren que el noreste del Caribe fue de 1-2°C más frío que el presente durante la Pequeña Edad de Hielo. Análisis wavelet de los registros indican que cuando la irradiancia solar total (IST) alcanza un valor umbral de 1365.29Wm-2 existe un acoplamiento del ciclo de once años de manchas solares con la variabilidad decadal de la temperatura derivada de las escleroesponjas. Los resultados sugieren una respuesta de la temperatura local a IST de 0.62°C(W/m2)-1 para el siglo 20, similar a valores mundiales de sensibilidad solar climática anteriormente publicados.en_US
dc.description.sponsorshipDeep Reef Ecosystems Studies (Deep CRES) project;en_US
dc.language.isoenen_US
dc.subjectCeratoporella nicholsoni--Puerto Ricoen_US
dc.subjectWavelet analysisen_US
dc.subjectOcean temperature--Caribbean Seaen_US
dc.subjectSclerosponges--Isotopic indicators--Puerto Ricoen_US
dc.subject.lcshOcean temperature--Caribbean Sea--Observationsen_US
dc.subject.lcshWavelets (Mathematics)en_US
dc.subject.lcshClimatic changes--Caribbean Seaen_US
dc.titleCaribbean sea water temperatures of the last 500 years as derived from Sclerospongesen_US
dc.typeThesisen_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(c) 2013 Juan A. Estrella Martínezen_US
dc.contributor.committeeSherman, Clark
dc.contributor.committeeRamírez, Wilson R.
dc.contributor.committeeKubaryk, John M.
dc.contributor.representativeIrizarry-Soto, Emmanuel
thesis.degree.levelM.S.en_US
thesis.degree.disciplineMarine Sciencesen_US
dc.contributor.collegeCollege of Arts and Sciences - Sciencesen_US
dc.contributor.departmentDepartment of Marine Sciencesen_US
dc.description.graduationSemesterSpringen_US
dc.description.graduationYear2013en_US


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