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 18 of 18 for “"Stratocumulus"”.
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Lidar and infrared radiometer studies of stratocumulus clouds
This thesis comprises a study of marine stratocumulus clouds measured by ground-based Lidar and Infrared RADiometry (or LIRAD). The clouds were measured in northwestern Tasmania in the winter of 1993 and summer of 1995 during the Southern Ocean Cloud Experiment (SOCEX). The study done for this …
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A numerical model study of the stratocumulus-topped marine boundary layer
… to quantitatively reproduce processes in the stratocumulus topped boundary layer using measurements of atmospheric turbulence from aircraft from the North Sea and the subtropical North Atlantic and North Pacific. The model is robust to changes in the mixing length coefficients used in the …
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The influence of longwave cloud-top cooling on marine stratocumulus cloud transitions
… sunset) of the turbulent structure within the stratocumulus-topped boundary layer in the Southeast Pacific is simulated using near-LES model framework and sounding data from the Variability of American Monsoon Systems (VAMOS) Ocean–Cloud–Atmosphere–Land Study Regional Experiment (VOCALS-REx) as …
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Regional flow conditions associated with stratocumulus cloud-clearing events over the southeast Atlantic
… events have been documented in the marine stratocumulus cloud deck that resides over the subtropical Southeast Atlantic Ocean. In these events, clouds are rapidly eroded along a line hundreds–to–thousands of kilometers in length that generally moves westward away from the African coast. …
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Single-column and mixed-layer model analysis of subtropical stratocumulus response mechanisms relevant to climate change
Subtropical stratocumulus clouds are important part of the Earth's energy budget. The response of low clouds to Earth's changing climate is one of the dominant uncertainties in global warming projections, due primarily to unresolved parameterized cloud processes in global climate models (GCMs). …
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Observations of aerosol-cloud interactions with varying vertical separation between biomass-burning aerosols and stratocumulus clouds over the South-East Atlantic
… how the microphysical properties of marine stratocumulus clouds over the South-East Atlantic varied depending on whether overlying biomass-burning aerosols were present immediately above, or separated from cloud tops. Forty vertical cloud profiles were classified into two regimes, Mixing and …
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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
… this study, the radiative properties of Arctic stratocumulus are studied by comparing measurements for two days in August 2008 during the Arctic Surface Cloud Ocean Study (ASCOS) with simulations using the Rapid Radiative Transfer Model (RRTM). Cloud radiative forcing for both days is examined, …
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The formal generation of models for scientific simulations
… to generate a model of entrainment in marine stratocumulus. The resulting simplified model is appropriate for use as part of a parameterisation of marine stratocumulus in a Global Climate Model.
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Assessing impact of the sulfate aerosol first indirect effect on tropical cyclone activity
… implemented with the goal of producing low-lying stratocumulus clouds to increase total cloud cover, but the single-column WTG scheme was not able to produce stratocumulus that did not also produce an overly strong negative feedback. Using the single-column model, one can demonstrate the indirect …
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Examination of the behavior of modis-retrieved cloud droplet effective radius through misr-modis data fusion
… that range from 0 to +0.6 μm in the marine stratocumulus regions and -2 to 0 μm in the cumuliform cloud regions. This curious finding seems to suggest that the vertical distribution of drop sizes for marine stratocumulus clouds are very different from other types of marine liquid water …
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Interannual variability in cloudiness, sea surface temperature, and atmospheric circulation over the midlatitude North Pacific during summer
… stratus and the transition from midlatitude stratocumulus to subtropical cumulus. Since MSC reduces the amount of radiation absorbed by the ocean, these processes create the potential for a positive MSC feedback on SST; however, estimated MSC radiative anomalies are observed to have little …
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Investigating Elevated Aqua Modis Aerosol Optical Depth Retrievals Over The Mid-Latitude Southern Oceans
… high AOD belt, although largely attributed to stratocumulus and low broken cumulus cloud contamination as suggested by CALIOP products, could not be fully credited to cloud contamination. Collocated CALIOP data also suggest that the current cloud screening methods implemented in the over ocean …
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Studies of Reactive Halogen Species (RHS) in the Marine and mid-Latitudinal Boundary Layer by Active Longpath Differential Optical Absorption Spectroscopy
… die mikrophysikalischen Eigenschaften von Stratocumulus Wolken beein ussen, kann in diesen Beobachtungen eine groe Bedeutung fur das Klima liegen. Im Rahmen der vorliegenden Arbeit wurden drei Feldmesskampagnen unter Verwendung der aktiven Langpfad DOAS Messmethode durchgefuhrt, um das …
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Investigation of tropospheric arctic aerosol and mixed-phase clouds using airborne lidar technique
… precipitating into the lower supercooled stratocumulus deck were discussed in terms of the lidar signal intensity profiles and corresponding depolarisation ratio profiles. For parts of the cloud system characterised by almost negligible multiple scattering the calculation of the particle …
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Evaluating The Impact Of Above-Cloud Aerosols On Cloud Optical Depth Retrievals From Modis
… Tonkin region, from smoke advection over marine stratocumulus clouds and outflow into the northern South China Sea in spring. This study shows the necessity of accounting for the above–cloud aerosol events for future studies using standard MODIS cloud products in biomass burning outflow …
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On the role of natural laboratories and natural experiments in elucidating cloud-aerosol-climate interactions: A story of ships, smoke, and shutdowns
… smoke effects on the transition between overcast stratocumulus and scattered cumulus clouds in regional climate and large eddy simulation models and compare the results with observations from recent field campaigns. Interactions between smoke and the large-scale circulation alter above-cloud …
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The dependence of arctic mixed phase stratus ice cloud microphysics on aerosol concentration using observations acquired during ISDAC and M-PACE
… during 5 sorties through single-layer arctic stratocumulus on 8 April, 18 April, and 26 April 2008 during the Indirect and Semi Direct Aerosol Campaign (ISDAC) and by the University of North Dakota Citation on 4 sorties on 9, 10 and 12 October 2004 during the Mixed Phase Arctic Cloud …
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The representation of cloud cover in atmospheric general circulation models
… in the simulation of clouds exist. Subtropical stratocumulus and extratropical cloudiness are underestimated, while the cloud fraction in the trade cumulus areas and in the Intertropical Convergence Zone is overestimated. In the second part of the study detailed revisions of the parametrization …