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 60 for “"diurnal cycle"”.
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Diurnal cycle of deep tropical convection
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1992.
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Morphological changes in hypothalamic neurosecretory nuclei during the diurnal cycle
Thesis (M.A.)--Michigan State University. Dept. of Psychology,
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The diurnal cycle of cloud cover over southern and central Africa
… to improve the current understanding of cloud diurnal variability over this region by providing a base-line diurnal climatology of lowlevel, mid-level and high-level cloud cover. Diurnal variations of cloudiness are examined using ten years of cloud data from latest version of the International …
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The diurnal cycle of air pollution in the Kathmandu Valley, Nepal
… the most comprehensive study to date of the diurnal cycle of air pollution in the Kathmandu Valley, Nepal -- a bowl-shaped mountain valley of two million people with a growing air pollution problem but little past research. Field measurements and computer simulations were used to study the …
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The Madden-Julian Oscillation and the diurnal cycle over the Maritime Continent: scale interactions and modelling
… source of variability in precipitation is the diurnal cycle. The archipelago is within the convective region of the Madden-Julian Oscillation (MJO), which provides the greatest variability on intra-seasonal time scales: large-scale (�107 km2) active and suppressed convective envelopes propagate …
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Convective cloud and rainfall processes over the Maritime Continent : simulation and analysis of the diurnal cycle
… largely due to inadequate representation of the diurnally-varying processes related to convection. In this work, a coupled numerical model of the land-atmosphere system (RegCM3-IBIS) is used to investigate how more physically-realistic representations of these processes can be incorporated into …
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Upper ocean dynamics during the LOTUS and TROPIC HEAT experiments
… currents, and extended over one entire seasonal cycle. The TROPIC HEAT experiments took place in the central equatorial Pacific Ocean during two 12-day periods in 1984 and 1987, at opposite extremes of the seasonal cycle. We use observations from these field experiments as well as one-dimensional …
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A Study on the Diurnal and Seasonal Cycles of Tropical Cirrus Clouds
… 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 (CATS) and the fifth-generation hourly reanalysis product …
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A Wall of Smoke: Understanding the Drivers of the June 2023 Canadian Wildfire Smoke Event for New York City
… layer and lower troposphere. Additionally, the diurnal cycle of the source fires matches the diurnal cycle of PM2.5 concentrations in New York City downstream. Trajectory analyses, observations, and reanalysis all converge on this understanding. Finally, the anomalous nature of the stationary …
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A model of the temporal and spatial distribution of carbon monoxide in the mixed layer
A field experiment demonstrated the presence of a diurnal cycle in the concentration of carbon monoxide ([CO]) in the upper ocean at the BATS site. A series of laboratory experiments and numerical simulations were carried out to assess the diurnal variation in [CO] both at the sea surface and in …
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An Investigation of magnetic storm effects on total electron content over South Africa for selected periods in solar cycles 23 and 24
… on TEC over South Africa for portions of Solar Cycles 23 and 24. The MAGIC package was used to estimate TEC over South Africa during Post Solar Maximum, Solar Minimum, and Post Solar Minimum periods. It is found that TEC is largely determined by the diurnal cycle of solar forcing and subsequent …
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Evolution of diurnal surface winds and surface currents for Monterey Bay
The diurnal-period fluctuations of winds and surface currents are analyzed for September 1992 in and around Monterey Bay. Wind records are compared for three coastal stations and two mooring sites. Remotely-sensed surface current observations from two CODAR (HF radar) sites are used to explore the …
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Techniques for the Collection and Assay of Sleep Promotion Factor in Exercised and Sleep Deprived Dogs
… which makes use of the Pieron Phenomenon and the diurnal cycle of locomotor activity in rats. Summary. This paper describes several techniques which, when appropriately combined, can be incorporated into subsequent experiments measuring the effects of a variety of parameters on the productlon of …
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The Nocturnal Low-Level Jet in Tropical West Africa: Generation and Representation in Various Data Archives
… pressure gradient force has a particularly large diurnal cycle (due to the formation of a heat low to the north of the region). In this study, the nocturnal low-level jet is examined using radiosonde and ultra high frequency (UHF) wind profile data gathered during the African Monsoon …
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Melt Detection and Estimation in Greenland Using Tandem QuikSCAT and SeaWinds Scatterometers
… data at the ETH Camp in western Greenland. The diurnal cycle of backscatter measurements is also analyzed at this location. The melt detection and estimation method is applied to the entire Greenland ice-sheet. The resulting melt classifications and melt severity indexes are used to generate a …
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Tropical oceanic mesoscale cold pools in observations and models
… are important mechanisms controlling the life cycle of tropical convective systems. However, few observational techniques are available to routinely observe the properties of cold pools and their association with convection. The primary goal of the first part of this study is to demonstrate a …
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The commercial spaceport
… strip to the ethos of excess that subverts the diurnal cycle, Las Vegas has always been a testing ground. As a threshold to the fringe, the spaceport is a natural extension of this narrative.
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CWRF summer precipitation prediction over the United States land and coastal oceans: effects of ensemble cumulus parameterization closures
… total amount, frequency and intensity, and the diurnal cycle. In particular, coarse-resolution climate models have low predictive skills at regional scales, while the higher-resolution regional climate/weather models show improved downscaling skill but still exhibit biases and are highly …
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Modelling the atmospheric chemistry of volcanic plumes
… identified in this investigation vary with the diurnal cycle. In the modelled plume all of the bromine is involved in O3-destructive cycling. When HBr is exhausted, volcanic HCl sustains the cycling. The rate-limiting factor of this cycling, and therefore the rate of O3 destruction, is sunlight. …
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Seasonal and Diurnal Variations in the Temperature and Sodium Density Structure of the Middle Atmosphere
… during both day and night throughout the annual cycle. Coverage over the complete diurnal cycle produces unbiased, background profiles and enables an accurate characterization of tidal oscillations. The thermal structure was determined from 80 to 105 km, and the Na density structure from 76 to …
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