Date of Award

1-1-2018

Language

English

Document Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

College/School/Department

Department of Atmospheric and Environmental Sciences

Content Description

1 online resource (ii, ix, 138 pages) : illustrations (some color), color maps

Dissertation/Thesis Chair

Paul E Roundy

Committee Members

Lance F Bosart, Heather M Archambault, John Molinari

Keywords

Circulation, MJO, Momentum, Patterns, Statistics, TC, Madden-Julian oscillation, Cyclones

Subject Categories

Atmospheric Sciences

Abstract

Relationships between the Madden–Julian oscillation (MJO) and the extratropical circulation have been leveraged extensively to improve subseasonal prediction. However, in certain situations, tropical cyclones (TCs), which often coincide with enhanced MJO activity, can constructively or destructively interfere with MJO organization and common pathways through which the extratropics responds to the MJO. To examine this potential interference, the first portion of this study leverages a statistical experiment to relate West Pacific TC presence in different parts of the basin during a given MJO phase to subsequent remote extratropical circulation outcomes. The results of this experiment demonstrate that significant, high amplitude remote circulation anomalies that align with or differ from those expected to lag a given MJO phase tend to develop in association with TCs that cluster in specific parts of the basin and at specific leads––in some cases, more than two weeks before a pattern emerges. These spatial and temporal clusters vary between MJO phases.

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