[Eoas-seminar] Meteorology Masters Defense: Heather Roman-Stork Seminar, Thursday June 28, 2018, 9:30 AM, LOV 353

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Wed Jun 20 16:37:36 EDT 2018

Meteorology Seminar

Heather Roman-Stork

M.S. Meteorology Candidate

Title:  "Analysis of the 10-20-day Intraseasonal Oscillation in the Indian Ocean Using Surface Winds from Composite Satellite Data"

Major Professor:  Dr. Mark Bourassa

Date: Thursday, June 28th, 2018                      Time: 9:30 AM

Location: Werner A. Baum Seminar Room (353 Love Building)
(Please join us for refreshments served outside room 353 Love @ 9:00 AM)


The 10-20-day mode of surface winds is examined in the Indian Ocean, with special reference to the Arabian Sea, the Bay of Bengal, and the equatorial Indian Ocean during a strong (1994), weak (2002), and normal (1995) Indian summer monsoon. The winds are from the Cross Calibrated Multi-Platform (CCMP) gridded wind product version 2.0. Results indicate the 10-20-day mode of latitudinally averaged surface winds have zonal propagation in the western Indian Ocean (west of 75°E) and the signal appears stationary in the eastern Indian Ocean (east of 75°E) during May through September. The meridional propagation of the 10-20-day mode of longitudinally averaged surface winds appears weak during summer monsoon periods. The 10-20-day mode of surface winds in the Arabian Sea and the Bay of Bengal is more energetic than in the equatorial Indian Ocean. The signal of the 10-20-day mode appears more robust during a strong monsoon than during a weak monsoon in the Arabian Sea; however, no significant difference is found in the Bay of Bengal and equatorial Indian Ocean between strong and weak monsoons. Empirical mode decomposition (EMD) analysis is used on a time series from the Arabian Sea to create an index for the 10-20-day mode in surface winds. Using this index, 75 cases of 15-phase 10-20-day events are identified and used to create composites of surface winds. Through these composites, a positive surface wind anomaly is found to appear at 60°E, centered on 15°S, and propagate zonally eastward to 90°E before reflecting back to propagate westward and then disperse off the coast of Madagascar. It is proposed that this oscillating positive wind anomaly is a feature of the southernmost cell of the 10-20-day double-cell structure that has extended farther south into the southern Indian Ocean.

Shel McGuire
Florida State University
Academic Program Specialist
Department of Earth, Ocean, & Atmospheric Science
600 West College Avenue, 410 Love Building (Meteorology)
Tallahassee, FL 32306

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