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Influence of Mesoscale Sea Surface Temperature Gradients on Tropical Cyclones

Title: The Influence of Mesoscale Sea Surface Temperature Gradients on Tropical Cyclones.
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Name(s): Glazer, Russell Henderson, 1989-, author
Bourassa, Mark A., professor co-directing thesis
Hart, Robert Edward, 1972-, professor co-directing thesis
Powell, Mark Dillon, 1952-, committee member
Misra, Vasubandhu, 1970-, committee member
Florida State University, degree granting institution
College of Arts and Sciences, degree granting college
Department of Earth, Ocean, and Atmospheric Science, degree granting department
Type of Resource: text
Genre: text
Issuance: monographic
Date Issued: 2014
Publisher: Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
Physical Form: online resource
Extent: 1 online resource (56 pages)
Language(s): English
Abstract/Description: The effects of mesoscale (50-1000km) sea surface temperature (SST) variability on tropical cyclones (TCs) are investigated with model simulations of an idealized TC as well as simulations of Hurricane Igor (2010) using the Weather Research and Forecasting (WRF) model. Mesoscale SST gradients significantly modify the surface wind speed and direction leading to areas of enhanced divergence/convergence and curl along the gradient. This paper explores the effects that these interactions between mesoscale SST gradients and the atmosphere have on TCs. In these idealized simulations it is shown that an SST gradient of similar scale to the idealized TC vortex produces asymmetry in the eyewall convection and leads to vertical misalignment of the vortex. Simulations of Igor are conducted with three different SST setups: a run with an unaltered SST field, a run with increased SST gradients, and a run with decreased SST gradients. Igor's intensity and structure is found to be sensitive to the three different SST setups but the specific mechanism could not be identified. It is found that the magnitude of moisture advection increases with increasing SST gradient magnitude on the warm side of a gradient.
Identifier: FSU_migr_etd-9177 (IID)
Submitted Note: A Thesis submitted to the Department of Earth, Ocean, and Atmospheric Science in partial fulfillment of the requirements for the degree of Master of Science.
Degree Awarded: Fall Semester, 2014.
Date of Defense: November 5, 2014.
Keywords: Air-Sea Interaction, Numerical Modeling, Sea Surface Temperature, Tropical Cyclones, Tropical Meteorology
Bibliography Note: Includes bibliographical references.
Advisory Committee: Mark Bourassa, Professor Co-Directing Thesis; Robert Hart, Professor Co-Directing Thesis; Mark Powell, Committee Member; Vasu Misra, Committee Member.
Subject(s): Meteorology
Atmospheric sciences
Oceanography
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9177
Owner Institution: FSU