Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 19 of 19 for “"the Madden-Julian oscillation"”.
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The Madden-Julian Oscillation and Convective Aggregation
The Madden-Julian oscillation (MJO) is a region of enhanced precipitation which forms every 30-60 days over the Indian Ocean and slowly propagates to the east over the Pacific. Despite being the dominant mode of intraseasonal variability in the tropical troposphere, most numerical models struggle …
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The Madden-Julian oscillation and nonlinear moisture modes
The Madden-Julian oscillation (MJO), the dominant tropical intraseasonal variability with widespread meteorological impacts, continues to puzzle the climate research community on both theoretical and modeling fronts. Motivated by a recent interest in the role of humidity in tropical dynamics, this …
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Radiative feedbacks in tropical organized convection and the Madden-Julian oscillation
The organization of tropical deep convection is supported by radiative feedbacks, in which high clouds and moisture anomalies associated with convection imposes anomalous longwave (LW) radiative heating in the atmosphere, further supporting convection. Despite an abundance of studies using …
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On intraseasonal variability in the tropics: tropical cyclones, the Madden-Julian Oscillation, and equatorial waves
… by tropical cyclones, equatorial waves, and the Madden-Julian Oscillation (MJO). Because these phenomena have significant societal impacts on sub-seasonal time scales, and it is important to understand how they interact with the large-scale atmosphere. The first part of this thesis develops …
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The Madden-Julian Oscillation and the diurnal cycle over the Maritime Continent: scale interactions and modelling
The Maritime Continent archipelago, situated on the equator at 95°–165°E, has the strongest land-based precipitation on Earth. The latent heat release associated with the rainfall affects the atmospheric circulation throughout the tropics and into the extra-tropics. The greatest source of …
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Comparison of cloud systems simulated with two-dimensional and three-dimensional cloud resolving models
… (3D) cloud resolving models (CRM) are some of the best tools that can be used to simulate convective cloud systems and their properties relative to larger scale models. But, when attempting to understand when a certain type of CRM should be used, previous studies on the effects of …
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Teleconnective Influences on the Strength of Post-tropical Cyclones
<p>Over the 1951-2009 time period, 47% of all tropical systems in the Atlantic Basin transitioned to post-tropical storms. These storms are capable of producing hurricaneforce winds, torrential, flooding rains and storm surge that floods coastal areas. This study adds to previous climatological …
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Long-range statistical forecasting of Korean summer precipitation
… (KSP). We reviewed existing literature on the East Asian summer monsoon to develop a background on current KSP research and on the relationship of KSP to climate variations. Second, we explored interannual variability of KSP using composite and correlation analyses. We found that …
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The Effect of Orbital Forcing on the MJO’s Amplitude and Phase Speed
The Madden-Julian Oscillation (MJO) has a pronounced seasonal cycle, drifting from the Southern Hemisphere in boreal winter to the Northern Hemisphere in boreal summer, with a maximum intensity during boreal winter in the Southern Hemisphere. The reason for this maximum intensity during boreal …
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Towards using neural networks for geoscientific discovery
… has been asked in some form for decades within the geoscientific community, with many landmark discoveries resulting from the novel application of computational methods to a geoscientific dataset. For example, the Madden-Julian Oscillation was discovered through Fourier transforms of tropical …
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Surface heat fluxes and MJO propagation through the Maritime Continent
The 'barrier effect' of the Maritime Continent (MC) is a known hurdle in understanding the propagation of the Madden-Julian Oscillation (MJO). To understand the differing dynamics of MJO events that propagate versus stall over the MC, a new MJO tracking algorithm utilizing 30-96 day filtered NOAA …
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The Study of the Indian Ocean Response to Climatic Events Using Satellite Observations and Model Simulations
<p>The interactions of intraseasonal and interannual climate variability with surface ocean properties is an active area of research in the Indian Ocean region. Understanding how climate variations impact basin-wide salinity patterns is an important step in understanding how this variable impacts …
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Vegetation feedback on the boundary layer climate of South Africa
Upward feedbacks from the land surface and vegetation to the atmospheric boundary layer over southern Africa are investigated. Satellite derived rainfall and vegetation data and model evaporative fluxes for the period 1981-2000 are used to reveal spatial and temporal inter-relationships via …
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Toward better subseasonal-to-seasonal prediction: physics-oriented model evaluation and predictability of tropical cyclones
… and agricultural planning that falls into the weekly to seasonal time ranges. The S2S prediction, bridging the traditional weather forecasting and climate prediction, remains a challenge for global numerical models. This is mostly because the sources of predictability on S2S timescales are …
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Coupled Air-Sea-Land Interactions: Understanding the MJO Eastward Propagation and Maritime Continent Barrier Effect
The Madden-Julian oscillation (MJO) is the leading mode of tropical intraseasonal variability affecting the global weather and climate. The MJO is characterized by large-scale organized convection and its associated circulation that develops over the tropical Indian Ocean (IO) and propagates into …
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Role of multiscale atmospheric conditions in the evolution of convective organization during MJO-1 of DYNAMO/CINDY/AMIE
… and 6-hourly ERA-interim reanalysis data shows the multiscale atmospheric conditions and changes in convective organization during a central Indian Ocean Madden-Julian Oscillation (MJO) event observed by the DYNAMO/CINDY/AMIE field campaigns in October 2011. Shifts in reflectivity and …
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Tropical oceanic mesoscale cold pools in observations and models
Convective cold pools over oceans contribute to the atmosphere-ocean exchange of heat and moisture across the globe. Beyond cold pools’ physical properties, cold pools and their intersections are important mechanisms controlling the life cycle of tropical convective systems. However, few …
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Application of open-access and 3rd party geospatial technology for integrated flood risk management in data sparse regions of developing countries
Floods are one of the most devastating disasters known to man, caused by both natural and anthropogenic factors. The trend of flood events is continuously rising, increasing the exposure of the vulnerable populace in both developed and especially developing regions. Floods occur unexpectedly in …