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 12 of 12 for “"Walker circulation"”.
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The impacts of Amazon deforestation on Pacific climate
… can enhance El Niño conditions by weakening the Walker circulation. Correlations between annual rainfall rates over the Amazon and other atmospheric parameters (global precipitation, surface air temperature, low cloud amount, 500 hPa vertical velocity, surface winds, and 200 hPa winds) over the …
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Water vapour transport from the South Atlantic and Indian Oceans and summer rainfall in southern Africa
… an eastward shift of the ascending branch of the Walker circulation, suppressing convection and thus reducing rainfall over the subcontinent.
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Understanding the impacts of ENSO patterns on droughts over southern Africa using SPEEDY
… ensemble simulations from SPEEDY (a general circulation model from the International Centre for Theoretical Physics) and used two drought indices (SPEI: Standardized Precipitation Evapotranspiration Index; SPI: Standardized Precipitation Index) to characterize drought. The capability of …
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Simple Models for Complex Tropical Dynamics
… simplified simulations, and full general circulation models -- to study tropical phenomena including the Hadley Circulation, the Inter-Tropical Convergence Zone (ITCZ), the South Asian monsoon, Pacific and ENSO seasonality, the Walker Circulation, and the modeling of the tropical energy …
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Using a multiproxy analysis of springbok fossils to track 2 million years of vegetation changes experienced by hominins in southern Africa.
… Northern Hemisphere Glaciation, the onset of the Walker Circulation and the Mid-Pleistocene Revolution, have been linked to palaeoenvironmental changes that catalysed hominin evolutionary events in Plio-Pleistocene Africa. Climate-induced faunal turnover has not been found in East Africa, largely …
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INVESTIGATION OF TRACER GAS VARIABILITY FROM OBSERVATIONS AND MODELS
… During strong (weak) monsoon years, the Western Walker Circulation was strong (weak), resulting in more (less) CO2 in the mid-troposphere. The MOZART-2 model results were consistent with observations with a smaller amplitude. In the North Hemisphere polar region, the influence of sudden …
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An Energetic Perspective on the Tropical Atmosphere and its Response to Climate Warming
… stability (GMS), and the response of the Pacific Walker circulation (WC) to warming. There have been a number of mechanisms proposed to explain the response of precipitation to warming. The ``wet-get-wetter'' mechanism describes an amplification of the pattern of precipitation in a moister …
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High-Latitude Southern Hemisphere Climate Variability, Trends, and Tropical Forcing.
… trends in Antarctic sea ice and atmospheric circulation, as diagnosed from observations, reanalyses, and simulations using an Atmospheric General Circulation Model (AGCM). Three components are examined: Antarctic sea ice concentration (SIC) variability is investigated in relation to the …
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Deciphering multiple changes in complex climate time series using Bayesian inference
… associated to the establishment of the modern Walker-Circulation contributes to the current discussion about the influence of paleoclimate changes on the environmental conditions in tropical and subtropical Africa at around two million years ago.
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Extremes in events and dynamics : a nonlinear data analysis perspective on the past and present dynamics of the Indian summer monsoon
… Hemisphere and the onset of the tropical Walker circulation. Although this new method has general applicability, it is particularly useful in analysing short palaeo-climate records. Rainfall during the ISM over the Indian subcontinent occurs in form of enormously complex spatiotemporal …
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LATE MIOCENE AND PLIOCENE PALEOCEANOGRAPHY OF THE LOW LATITUDE NORTHERN HEMISPHERE AND ITS IMPLICATIONS FOR FUTURE CLIMATE CHANGE
… and reorganization of oceanic and atmospheric circulation structure have helped shape the climate system into its present form. This study provides a reconstruction of sea surface temperature (SST), ocean circulation, and thermal structure of the LL eastern Pacific and North Atlantic based upon …