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Changes in Equatorial Atlantic Ocean Surface Wind Patterns Associated with a Climate Index Based on Historical Ship Observations

Title: Changes in Equatorial Atlantic Ocean Surface Wind Patterns Associated with a Climate Index Based on Historical Ship Observations.
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Name(s): Beal, Rebecca Lynn, author
Type of Resource: text
Genre: Text
Bachelor Thesis
Date Issued: 2021-04-15
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: The low level winds in the Caribbean Basin play an important role in moisture transport throughout the Americas and previous research has been done on the intra-annual (seasonal or smaller scale) variability in the region. This project studies the long-term variability of surface winds in the western equatorial Atlantic Ocean including the Caribbean Basin and Gulf of Mexico. Our findings show a pattern of variability (1920-2014) that may be an important factor in understanding the future climate of the Americas.A probabilistic index is created to represent the annual (or seasonal) anomalies of the probability of the sign of a vector wind component occurring for a selected region and period of time. This index is based on in-situ observations from the International Comprehensive Ocean-Atmosphere Data set . The average probability density function (pdf) for wind vector components is calculated, and for each year the anomalous values relative to the long-term pdf are counted. The difference is taken between the anomalies for positive and negative vector components, emphasizing shifts in the pdf.We selected several locations in the Caribbean Basin, and there is an increasing frequency of anomalous zonal winds (westerlies in an easterly flow) that correlates to an increase in the wind’s magnitude in the 20th Century Reanalysis. Further exploration into the variability of the winds using Ensemble Empirical Mode Decomposition isolates modes on different time scales. We identify a mode of multidecadal variability which correlates with the increasing likelihood of relatively eastward winds. This locally identified mode is applied to the larger Equatorial Atlantic region and the changing flow pattern is analyzed.
Identifier: FSU_libsubv1_scholarship_submission_1618520534_14d2e28d (IID)
Keywords: Caribbean Low Level Jet, Equatorial Atlantic, Ensemble Empirical Mode Decomposition, Probabilistic Indices
Grant Number: NA17OAR4310153
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_scholarship_submission_1618520534_14d2e28d
Host Institution: FSU

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Beal, R. L. (2021). Changes in Equatorial Atlantic Ocean Surface Wind Patterns Associated with a Climate Index Based on Historical Ship Observations. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_scholarship_submission_1618520534_14d2e28d