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Non-stationarity in extratropical north pacific atmospheric forcing of ENSO and its oscillatory behaviorPivotti, Valentina 27 January 2023 (has links)
As the largest mode of coupled climate variability, the El Niño Southern Oscillation (ENSO) carries consequences for weather patterns worldwide. In turn, communities that live in areas affected by ENSO variability would benefit from reliable and timely information on the occurrence of such events. To address this need, there has been an on-going effort within the scientific community to investigate and characterize the mechanisms that give rise to ENSO events. One of the greatest impediments to this effort, however, is that the ENSO system can behave both as a self-sustained, deterministic oscillation, and as a response to stochastic forcing. In this dissertation, we uncover a key determinant of these two types of ENSO behavior – namely North Pacific Oscillation (NPO)-induced variations in the northeasterly trade winds – and analyze how the variations in these trade winds influence ENSO variability historically and into the future.
The first Chapter of this dissertation provides a thorough review of previous efforts to understand the initiation, onset, and evolution of ENSO events with a particular focus on the relationship between ENSO events and two NPO-related precursors, namely the Trade Wind Charging and the Northern Pacific Meridional Mode (TWC/NPMM).
In Chapter 2 (Pivotti and Anderson 2021), we study the TWC/NPMM-ENSO relation over 140 years and uncover that there has been a multi-decadal modulation in the strength of TWC/NPMM’s influence upon ENSO events. Further, as a consequence of this modulation, ENSO behavior shifted between a stochastically forced interannual mode of variability to a multi-annual, quasi-regular one with a self-sustained oscillation and back again over the course of the last 140 years.
In Chapter 3, we assess how the TWC/NPMM-ENSO relationship is reconstructed in state of the art coupled climate models. We find that across the ensemble the TWC/NPMM is reconstructed by all models as the leading ENSO precursor. Further, a subset of better-performing models confirms that during those periods when the TWC/NPMM-ENSO coupling is weak, ENSO oscillates regularly with constant periodicity, whereas when the coupling is strong, ENSO shows a more stochastic behavior.
In Chapter 4, we introduce experiments with increasing anthropogenic radiative forcings from the same ensemble of coupled climate models evaluated in Chapter 3. We find that ENSO events initiated by TWC/NPMM are consistently stronger than standard ENSO events, independent of the presence/absence of increasing external forcings, however neither TWC/NPMM-induced ENSO events nor standard events show any systematic change in intensity in the presence of increasing atmospheric forcings. Further, there is no systematic change in TWC/NPMM-ENSO coupling in the presence of increasing external forcing and hence no systematic change in the oscillatory (or stochastic) behavior of the ENSO system.
Finally, Chapter 5 of this dissertation includes a concluding summary and suggestions for future work. In summary, this dissertation shows for the first time that the ENSO system can behave both as a self-sustained oscillation and as a response to stochastic forcing, that the modulation of this behavior is linked to the strength of TWC/NPMM-ENSO coupling, and that the strength of this coupling is the result of multi-decadal internal climate variability and not human-induced climate change.
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The Impact of Dry Air on the Location of Tornado Outbreaks Associated with Landfalling Tropical Cyclones in the Atlantic BasinFeliciano-Camacho, Christian David 12 September 2016 (has links)
No description available.
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Temperature spectra of ice-nuclei in Canadian hail, rain, and snow.Shlien, Jacob January 1967 (has links)
No description available.
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A theoretical study of tides in the upper atmosphere.Nunn, David January 1967 (has links)
No description available.
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Structures d'ondes forcées sur une sphère en rotationLaprise, René January 1977 (has links)
No description available.
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Spectrum truncation error in the estimation of vorticity advectionBancroft, George P., 1951- January 1978 (has links)
No description available.
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Simulation temporelle des ondes longues atmosphériquesDesmarais, Jean-Guy January 1977 (has links)
No description available.
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Factors influencing the diurnal temperature range in the contiguous United States /Durre, Imke. January 2000 (has links)
Thesis (Ph. D.)--University of Washington, 2000. / Vita. Includes bibliographical references (leaves 104-116).
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The nature of the propagation of sea breeze fronts in Central CaliforniaYetter, Joseph A. January 1990 (has links) (PDF)
Thesis (M.S. in Meteorology and Oceanography)--Naval Postgraduate School, September 1990. / Thesis Advisor(s): Shaw, William J. Second Reader: Durkee, Philip A. "September 1990." Description based on title screen as viewed on December 15, 2009. DTIC Identifier(s): Fronts (Meteorology), Atmosphere Models, Wave Propagation, LASBEX (Land Sea Breeze Experiment), Meteorological Data, Circulation, Directional, Atmospheric Motion. Author(s) subject terms: LASBEX, Lidar, Sodar. Includes bibliographical references (p. 64-65). Also available in print.
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Large-scale moisture flux analysis for the United StatesWang, Sheng-Hung, January 2004 (has links)
Thesis (Ph. D.)--Ohio State University, 2004. / Title from first page of PDF file. Document formatted into pages; contains xviii, 154 p.; also includes graphics (some col.). Includes abstract and vita. Advisor: Jeffery C. Rogers, Dept. of Atmospheric Science. Includes bibliographical references (p. 142-153).
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