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The impacts of multiple simultaneous climate variations

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Author
Ilczuk, Richard E., Jr.
Date
2016-12
Advisor
Murphree, Tom
Hutchins, Megan
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Abstract
Climate variations—such as El Niño–La Niña (ENLN), the Madden–Julian Oscillation (MJO), and the Arctic Oscillation (AO)—have significant impacts on environmental conditions and operating environments around the globe. However, relatively little is known about how climate variations interact and alter each other's impacts. We used several multi-decadal reanalysis data sets to investigate the interactions between ENLN and MJO events. We analyzed the interactions by season, and by event amplitude and phase. We found substantial constructive and destructive interference between the tropical convection and subsidence centers of ENLN and MJO events, and the tropical and extratropical low-frequency wave responses to the events. This interference causes large differences in the anomalies that are commonly thought to characterize the events—for example, changes in the patterns, locations, magnitudes, and even signs of the wind, precipitation, and ocean surface wave anomalies associated with EN, LN, and the eight MJO phases. Our results indicate that analyses and forecasts of one type of climate variation need to account for the simultaneous occurrence of other types of climate variations. The data sets, methods, and results of this study will be used to improve operational climate and long range support products.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
URI
https://hdl.handle.net/10945/51724
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