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 46 for “"cirrus"”.
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Emission, scattering and absorption of radiation in cirrus cloud layers.
Thesis (Ph D.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1970.
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Assessment of Convectively Generated Tropical Cirrus in Global Storm-Resolving Models
Pervasive cirrus clouds in the upper troposphere and tropical tropopause layer (TTL) in- fluence the climate by altering the top-of-atmosphere radiation balance and stratospheric water vapor budget. These cirrus are often associated with deep convection, which global climate models must …
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Relating U.S. Cirrus Cloudiness to Surface Temperature and Global Teleconnection Indices
… region. It used datasets of manually taken cirrus cloud observations, average near-surface temperature, and teleconnection indices to examine cirrus cloudiness over the conterminous United States from 1971-1991.</p> <p> Monthly trends in cirrus cloudiness, relationships with near-surface …
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A Study on the Diurnal and Seasonal Cycles of Tropical Cirrus Clouds
Tropical cirrus clouds (TCC) regulate the Earth’s radiative energy 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 …
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Dependence of tropical cirrus clouds on sea surface temperature and consequences for the Archean climate
… the effect of the variations in the area of thin cirrus clouds. First, we look at the variation in area of upper level clouds using TRMM VIRS (Tropical Rainfall Measuring Mission, Visible Infrared Sounder) data. We quantify the effect of methodological choices on the magnitude of the observed …
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Measurements of small ice crystals in arctic cirrus: observations from the Indirect and Semi-Direct Aerosol Campaign (ISDAC)
… on the size and shape of particles in arctic cirrus are less common than those in mid-latitude and tropical cirrus with considerable uncertainty about the contributions of small ice crystals (maximum dimension D<50 µm) to the mass and radiative properties that impact radiative forcing. In situ …
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The Microphysical and Radiative Properties of Tropical Cirrus From the 2006 Tropical Warm Pool International Cloud Experiment (twp-Ice)
… on bulk scattering properties of tropical cirrus are quantified. The calculated mean asymmetry parameter g¯ for the fresh anvil (i.e., 2 Feb) is larger than that for cirrus bands of varying ages (i.e., 27 and 29 Jan.) for -60 < T < -45°C and -45 < T < -30°C where the fractional …
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Atmospheric radiative transfer in multiple scattering conditions. Application to NWP models.
… used in climate and weather prediction models. Cirrus clouds cover permanently 30% of the Earth's surface, representing an important contribution to the Earth-atmosphere radiation balance. The work has been focussed on the development of the RT model LBLMS. The model, widely tested in the …
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An Investigation Of Cloud Processes Relevant To Climate Sensitivity
… are characterization of the ice fall speed in cirrus clouds, ice nucleation in cirrus clouds and ground-based remote sensing of cloud properties in ice clouds and mixed phase clouds.Studies have shown that the ice fall speed determines one of the most important climate feedback processes. The …
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Band to Band Calibration and Relative Gain Analysis of Satellite Sensors Using Deep Convective Clouds
… in which calibration was transferred to cirrus band and coastal aerosol band from well calibrated reflective bands of Landsat 8 using SCIAMACHY Deep Convective Cloud (DCC) spectra. Second, a novel method to derive relative gains using DCCs and improve the image quality of cirrus band …
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Cloud Observations from the Mars Science Laboratory Mission: Seasonal Variability, Scattering Phase Function, and Validation of Optical Depths using Lidar Measurements of Terrestrial Cirrus Clouds
… the high cloud method by imaging high altitude cirrus clouds using a radiometrically calibrated camera and captur- ing simultaneous measurements wth the York University Lidar. In total, four coordinated experiments were conducted between September of 2015 and June of 2016.
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Design, development and evaluation of a distributed electric propulsion testbed aircraft
… DEP to perform vehicle-level flight control. A Cirrus SR22-T was chosen as a suitable airframe for DEP modifications and a 21% radio-controlled model was constructed and instrumented with a full data acquisition and flight control system to command and capture the aircraft’s state during flight. …
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Between Glimpses of Blue for Wind Ensemble and Fixed Media
… direct influence for the form and orchestration. Cirrus, Stratus, Cumulus, Nimbocumulus, as well as my own memories and impressions associated with clouds influence each section of the piece. These dictated the form of this piece through the progression from light to dense clouds. For instance, …
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Limb scatter measurements of high altitude cloud distributions
… the upper troposphere and lower stratosphere. Cirrus clouds occur at high altitude around the tropopause level and, despite their thin appearance and low optical thickness, they contribute to the radiative balance of the atmosphere. The processes in this region of the atmosphere have become …
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Non-CO₂ environmental impacts of transportation fuel use and production
… forcing (RF) generated by contrails and contrail cirrus in the scenario of a widespread use of alternative jet fuels in the U.S. The Contrail Evolution and Radiation Model (CERM) is developed to simulate contrail and contrail cirrus cover, properties and radiative forcing over the United States. …
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Assessment of a global contrail modeling method and operational strategies for contrail mitigation
… the impacts of contrails and aviation-induced cirrus on climate. Increasing demand for aviation will further increase contrail formation. This thesis provides a model to assess operational options for reducing contrail coverage. This model couples realistic flight performance and best-available …
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Validation, trend analysis & bias reduction through satellite fusion of the cloud-top height record from terra MODIS & MISR
… by CTH bias errors for geometrically thick cirrus and random errors due to forward modeling uncertainty. Furthermore, we established that scenes with 2-layered cloud systems with thin cirrus over thicker low clouds lead to significant disagreements between the two sensors. MISR detects the …
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