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Comparison of ECMWF and Quikscat-Derived Surface Pressure Gradients

Title: Comparison of ECMWF and Quikscat-Derived Surface Pressure Gradients.
Name(s): Taylor, Jeffrey P., author
Bourassa, Mark, professor directing thesis
Cunningham, Phillip, committee member
Ruscher, Paul, committee member
Department of Earth, Ocean and Atmospheric Sciences, degree granting department
Florida State University, degree granting institution
Type of Resource: text
Genre: Text
Issuance: monographic
Date Issued: 2006
Publisher: Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: A technique based solely on QuikSCAT data is developed for determining suspect differences between QSCAT and ECMWF pressure gradients. Pressure fields are computed from scatterometer winds using a variational method that applies a gradient wind conversion. Kinematic analysis of the satellite wind field is performed in order to determine which parameters are physically related to the suspect pressure gradients. It is discovered that the likelihood of these suspect occurrences has the greatest dependence on relative vorticity, total deformation, and the curvature Rossby number. A broad range of these values is tested and a single assessment criterion is derived based upon the value of several skill scores. Overall, the assessment criterion is able to correctly identify the majority of suspect pressure gradients; yet considerable over-flagging does occur in many instances. However, the over-flagging is not random: the false alarms are tightly clustered around the suspect areas, resulting in flagged regions that are too large. Identification of the location of suspect areas in pressure products should be useful to forecasters.
Identifier: FSU_migr_etd-1655 (IID)
Submitted Note: A Thesis Submitted to the Department of Meteorology in Partial Fulfillment of the Requirements for the Degree of Masters of Science.
Degree Awarded: Fall Semester, 2006.
Date of Defense: August 15, 2006.
Keywords: Flagging Techniques
Bibliography Note: Includes bibliographical references.
Advisory committee: Mark Bourassa, Professor Directing Thesis; Phillip Cunningham, Committee Member; Paul Ruscher, Committee Member.
Subject(s): Meteorology
Persistent Link to This Record:
Owner Institution: FSU

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Taylor, J. P. (2006). Comparison of ECMWF and Quikscat-Derived Surface Pressure Gradients. Retrieved from