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 20 of 110 for “"seasonal cycle"”.
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Changes in atmospheric eddy length with the seasonal cycle and global warming
… to set the eddy length. The GCMs reproduce the seasonal variation in the eddy lengths seen in the reanalysis. To explore the effect of latent heating on the eddies, a modification to the static stability is used to calculate an effective Rossby radius. The effective Rossby radius is an …
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The seasonal cycle of stationary planetary waves in the southern stratosphere : a numerical study
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1990.
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The Hydroclimate Variability of Central Africa: seasonal cycle, mechanisms, teleconnections and impacts on neighbouring regions
… rainfall and the mechanisms involved in its seasonal and interannual variability as well as to assess how an atmospheric general circulation model forced by observed sea surface temperature (SST), the ECHAM5.3 model, does represent the main features of Central Africa hydroclimate variability. …
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Understanding modelled sea-air CO2 flux biases in the Southern Ocean through the seasonal cycle
… that CMIP5 ESMs disagree on the phasing of the seasonal cycle of the CO2 flux (FCO2) and compare poorly with available observation estimates in the Southern Ocean. Notwithstanding these differences, the seasonal cycle is a dominant mode of CO2 variability in the Southern Ocean, and hence this is …
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The seasonal cycle of CO₂ fluxes in the Southern Ocean: a model spatial scale sensitivity analysis
… study by Lenton et al., 2013, compared the mean seasonal cycle of air-sea CO₂ flux in the Southern Ocean(SO) over 1990 – 2009 period using five ocean biogeochemical models(BGMs) and atmospheric and ocean inversion models with monthly mean observations for the year 2000. This was done using a set …
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A Field and Laboratory Study of the Seasonal Cycle of Chrysopa Carnea (Stephens) in Central Illinois (Neuroptera: Chrysopidae)
Made available in DSpace on 2014-12-11T18:05:40Z (GMT). No. of bitstreams: 1 7219927.pdf: 4324429 bytes, checksum: 14cab61a5e4eaca0aab41bef80e619f9 (MD5) Previous issue date: 1972
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Observing the seasonal cycle of pCO2 from autonomous pH measurements in the South Atlantic sector of the Southern Ocean
… hinge on our understanding of the global carbon cycle, and in particular, the role of the Southern Ocean (SO). Sea surface measurements across the SO are sparse and subject to temporal, spatial and seasonal biases. These biases arise from the inaccessibility of the SO due to the high-risk weather …
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Climate sensitivity study with energy balance models
… past climatic variations with two-dimensional seasonal energy balance model. This thesis consists of two parts. The first part is a study of the interaction between the seasonal cycle and the small ice cap instability, which is a possible mechanism for the initiation of glaciation in the …
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The value of independent component analysis in identifying climate processes
… through the identification of the land based seasonal cycle and the ocean based seasonal cycle. These qualities mean that ICA may further prove a useful tool in the problem of identifying components of climate change signals from ensembles of multiple climate models.
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The Effect of Orbital Forcing on the MJO’s Amplitude and Phase Speed
… 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 winter …
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Seasonal characteristics of phytoplankton bloom phenology in the northern Benguela Upwelling System
Seasonal phytoplankton blooms in the Benguela Upwelling System (BUS) play a crucial role in ecosystem services and driving climate change through air-sea gas exchanges. Upwelling systems are particularly are sensitive to effects of climate change including the transport of nutrients, which …
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An analysis of factors controlling the distribution of zooplankton in the Knysna estuary, South Africa
… to tidal exchange. The zooplankton displayed a seasonal cycle of abundance, with maximum numbers occuring during summer. P. hessei displayed no pronounced seasonal cycle in abundance. Its abundance was strongly related to freshwater inflow. Seasonal succession was evident between A. natalensis, …
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Ensemble forecasting in the Mediterranean sea
… are compared with model errors throughout the seasonal cycle proving the existence of a strong relationship between forecast uncertainties due to atmospheric forcing and the seasonal cycle.
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Improved estimates and understanding of interannual trends of CO₂ fluxes in the Southern Ocean
… and climate feedbacks that regulate the carbon cycle in the Southern Ocean. Studies have already shown that Southern Ocean CO₂ is subject to interannual variability. Measuring and understanding this change has been difficult due to sparse observational data that is biased toward summer. This …
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A Study on the Diurnal and Seasonal Cycles of Tropical Cirrus Clouds
… budget. However, mechanisms of the diurnal and seasonal cycles of their occurrence still require further investigation due to limited observations. This study utilizes observational data from the Cloud-Aerosol Transport System (CATS) and the fifth-generation hourly reanalysis product from the …
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The tropopause region thermal structure and tropical cyclones
… limits of tropical cyclone intensity across the seasonal cycle? The link between these subjects is tropical cyclone outflow, which often reaches into the tropopause region, allowing the thermal structure there to impact tropical cyclone potential intensity. A radiative transfer model is employed …
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On the origins of the ice ages : insolation forcing, age models, and nonlinear climate change
… of variability and singular vectors to represent seasonal and long-term changes. The leading four spatial and temporal modes describe over 99% of the insolation variability making this a relatively simple and compact description of the full insolation forcing. Particular attention is paid to the …
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Non-stationarity, forecast performance and fluctuations in macroeconomic series: Experience with United States seasonal data and simulations
… Recent research has shown that there is a seasonal cycle in the US economy that closely mirrors business cycles (Barsky and Miron, 1989). It is thus important to apply the seasonal unit root tests to investigate the question of seasonal non-stationarity in the data generating process (DGP) …
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Insight into the carbon cycle from continuous measurements of oxygen and carbon dioxide at Weybourne Atmospheric Observatory, UK
… tool to better understand the global carbon cycle. Technological improvements have resulted in near-real-time continuous measurements of both O2 and CO2 becoming viable. The increased time resolution of continuous measurements compared to discrete flask samples provides greater insight into …
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Modelling Benguela niños using the regional oceanic modeling system (ROMS)
… Oceanic Modelling System (ROMS) reproduce the seasonal cycle of the equatorial Atlantic? Secondly, what is the nature of the link between remote forcing in the western equatorial Atlantic and Benguela Niños/Niñas? Thirdly, what is the impact of these events on the equatorial Atlantic Ocean SST …
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