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 128 for “"Radiative Forcing"”.
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The cloud-radiative forcing of the U.S. landfalling atmospheric rivers
… energy budget through pathways such as cloud-radiative forcing (CRF). This dissertation studies the CRF of the U.S. Landfalling ARs in weather and climate scales. Three crucial questions are addressed. First, how do clouds produced by the ARs modulate the moisture and heat balance of the …
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Quantifying and reducing the uncertainties in global contrail radiative forcing
… have estimated the global, annual average, net radiative forcing (RF) to be 50 mW/m² in 2011, representing 2.3% of the RF due to all anthropogenic emissions. However, these estimates are uncertain and model estimates vary by more than one order of magnitude. In this thesis, I address three major …
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Radiative Forcing and Climatic Impact of the Mount Pinatubo Volcanic Eruption
Changes in radiative fluxes and atmospheric heating rates were computed by using the UIUC 24-layer Stratosphere/Troposphere General Circulation Model (ST-GCM) and a reconstructed dataset of the Pinatubo aerosol optical properties. Composite and the Singular Value Decomposition (SVD) analyses were …
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Speciated Local Aerosol Characteristics and Radiative Forcing at a Rural Midwestern Site
… EC, OC and dust-like aerosol, have significant radiative effects. Although the mass percentage of EC may be low at rural sites, ignoring the presence of EC aerosol leads to an over estimation of the aerosol forcing.
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Speciated Local Aerosol Characteristics and Radiative Forcing at a Rural Midwestern Site
… optical properties and the resulting direct radiative forcing. Size-segregated aerosol samples were collected during the summer of 1997 using three parallel MOUDIs operating at ambient relative humidity. Two sample sets were used to obtain sulfate, organic carbon (OC), elemental carbon (EC), …
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Climate impact of aviation NOx̳ emissions : radiative forcing, temperature, and temporal heterogeneity
… Prather et al. concluded that the short-lived O₃ radiative forcing (RF) was greater than the combined long-lived CH₄ and O₃ RFs, leading to a net positive RF (4.5 to 14.3 mW/m² per Tg of NOx emissions). However, few simulations assess the surface air temperature (SAT) response, or conduct a large …
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Direct Aerosol Radiative Forcing Based on Optical Measurements at Contrasting, Climatically Important Sites
"To characterize direct aerosol radiative forcing of climate ( DARF), aerosol optical properties were measured at two contrasting locations, a clean marine Southern Hemisphere site (Cape Grim Tasmania) and an anthropogenically perturbed Northern Hemisphere site (Sagres, Portugal). Total light …
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Convection in a differentially heated rotating spherical shell of Boussinesq fluid with radiative forcing
In this study we investigate the flow of a Boussinesq fluid contained in a rotating, differentially heated spherical shell. Previous work, on the spherical shell of Boussinesq fluid, differentially heated the shell by prescribing temperature on the inner boundary of the shell, setting the …
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The role of aerosols in the troposphere : radiative forcing, model response, and uncertainty analysis
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1996.
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United States Land Cover Land Use Change, Albedo and Radiative Forcing: Past and Potential Climate Implications
… properties including albedo that impose a radiative forcing on the climate. Recent spatially explicit satellite derived contemporary LCLU, albedo, and projected LCLU data are used to study the impact of LCLU change from 1973 to 2000, and from 2000 to 2050, on albedo and surface radiative …
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On the Atmospheric Saliency of Space Debris Reentries: Estimating Distribution, Lifetime and Radiative Forcing of Reentry-Ablated Alumina
… characterizing its distribution, lifetime and radiative effect using a state-of-the-art atmospheric model. We consider a future scenario where all of the megaconstellations with public Federal Communications Commission filings are deployed and maintained, leading to steady flux of 13,900 …
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The impact of Arctic cloud water and ice on cloud radiative forcing during the Arctic Summer Cloud-Ocean Study in August 2008
… is especially sensitive to changes in climate forcing; however, Arctic processes and feedbacks are not understood well enough to accurately predict how the Arctic environment might change under anthropogenic forcing. Further study of the basic atmospheric processes is needed, especially due to …
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Dynamics of cloud-top generating cells in winter cyclones
… This dissertation assesses the influence of radiative forcing and a range of cloud-top stability profiles on the development and maintenance of cloud top generating cells (GCs) in high-resolution (100 m grid spacing) idealized Weather Research and Forecasting model (WRF) simulations with …
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Aerosol particle light scattering at a perturbed mid-latitude continental northern hemisphere site and its dependence on relative humidity, wavelength of light, particle size and composition
… indicate that sulfate aerosol particles cause radiative forcing of the same magnitude but of opposite sign than the forcing caused by anthropogenic greenhouse gases. The spatial and temporal variability of parameters used in the models are highly uncertain resulting in uncertain model …
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Klimawirkung von Kondensstreifen: Untersuchungen mit einem globalen atmosphärischen Zirkulationsmodell
… time. Contrail coverage, optical properties and radiative forcing are calculated at any model time step depending in a physically based manner on the respective conditions in the ambient air. In addition, possible effects on atmospheric parameters can be simulated, allowing for the determination …
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Greenhouse gas equivalency metrics for evaluating energy technologies
… value to short- versus long-lived climate forcing. The equivalency metric approach is used in a large variety of applications, from technology evaluation to emissions trading. These applications almost universally rely on a single metric, developed as a placeholder over twenty-five years …
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The impact of volcanic halogens, climate change, and sulfate aerosol geo-engineering on the atmospheric effects of volcanic eruptions
… volcanic sulfur, stratospheric composition and radiative forcing following explosive volcanic eruptions injecting sulfur directly into the stratosphere is well understood. However, how the co-emission of volcanic halogens, climate change, and concurrent sulfate aerosol geo-engineering would …
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Mechanisms of Interactions between Aerosol Physics and Atmospheric Dynamics
… study revealed that the variability Saharan dust radiative properties is significantly linked to high-frequency atmospheric wave activity across the tropical Atlantic storm tracks, while the variability of smoke particles from the South African biomass burning is attributed by low-frequency …
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Constraining climate impact uncertainties from future aviation
… sector contribution to anthropogenic climate forcing is approximately 3.5%, representing up to 9% of US greenhouse gas emissions from transportation in 2018. Despite the COVID-19 crisis, it is also expected to grow at a global rate of approximately 4% per year in the next 20 years, and a full …
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Evaluating the influence of establishing pine forests and switchgrass fields on local and global climate
… mean change in global energy balance (i.e., radiative forcing) from planting a pine ecosystem rather than a switchgrass field was positive (pine warms climate) when considering changes in albedo and carbon measured using eddy-covariance systems. When including harvested carbon, pine and …
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