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 62 for “"upper troposphere"”.
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Disturbances in the tropical upper troposphere.
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1970.
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Frontogenetical processes in the upper troposphere.
Massachusetts Institute of Technology. Dept. of Meteorology. Thesis. 1965. M.S.
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Dynamical and radiative processes in the Upper Troposphere/Lower Stratosphere
… of certain key attributes and processes in the Upper Troposphere/Lower Stratosphere (UTLS). This work involves exploring the interactions between radiation and dynamics which ultimately affect the destination of chemical constituents. A recently identified feature of the extratropical upper …
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Short meridional scale anomalies in the lower stratosphere and upper troposphere
… shows maxima in the lower stratosphere and upper troposphere with a node between these maxima in the 200 to 400 mb region. The SMSA are not regularly propagating features. They are found to be episodic, with an episode lasting from 1 to 3 weeks;In addition to the temperature structure, the …
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An Investigation of the Distribution of Ozone-depleting Substances in the Upper Troposphere and Lower Stratosphere
Stratospheric transport in global circulation models and chemistry-climate models is an important component in simulating the recovery of the ozone layer as well as changes in the climate system. The Brewer-Dobson Circulation is not well constrained by observations and further investigation is …
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The Isotopic Composition of Water Vapor in the Upper Troposphere/Lower Stratosphere Region : Modeling, Analysis and Sampling
The isotopic composition of water vapor in the upper troposphere/lower stratosphere:} Exact knowledge about the isotopic composition of water vapor in the tropopause region and the stratosphere provides important information for the understanding of atmospheric transport and photochemistry. The …
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Convective Transport of Tropical Marine Boundary Layer Species into the Upper Troposphere and Relation to Species Lifetime: In Situ Measurements and Global Model Simulation
… on distribution of trace gasses in the tropical upper troposphere (UT) using data from the Convective Transport of Active Species in the Tropics (CONTRAST) Experiment conducted over the tropical western Pacific during January and February of 2014. Fifty-five chemical species measured during the …
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Measurement of Pernitric Acid, Hydrogen Chloride, and Sulfur Dioxide during the Intercontinental Chemical Transport Experiment Campaign
… to characterize the chemical composition of the troposphere in the eastern United States, Mexico City, and the North Pacific which is the outflow region of Asia. The first direct in situ measurements of HO2NO2 were made in the free troposphere over the eastern U.S. during summer 2004. The highest …
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Flugzeugmessungen von NO, NOy, CO und O3 in der freien Troposphäre zwischen 60 °N und 60 °S - Nord-Süd-Kontrast und Verteilung in den Tropen
… mixing ratios of NO, NOy, CO and O3 in the upper troposphere in the investigation area near Prestwick exceed the observed concentrations in Punta Arenas by factors of 4.5, 3, 1.5 and 1.2, respectively, due to the influence of convective vertical transport of polluted boundary layer air and …
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Spontaneous tropical cyclogenesis in a cloud revolving numerical model
… energy and potential vorticity fluxes from the upper troposphere. Exhibiting anticyclonic convergent flow, the upper troposphere is an unlikely source for the mid-level disturbance, while convective downdrafts and divergent surface flow hinder energy transport from the ocean to the growing …
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Post-combustion emissions control for aero-gas turbine engines
… magnified due to the higher sensitivity of the upper troposphere and lower stratosphere. In the aviation industry, efforts to increase the efficiency of propulsion systems are giving rise to higher overall pressure ratios which results in higher NO[subscript x] emissions due to increased …
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On the mechanism of the large-scale seasonally varying upwelling in the region of the tropical tropopause
… one of the principal components of stratosphere-troposphere mass exchange. The global-scale mean meridional circulation in the lower stratosphere and the upward branch of the tropospheric Hadley circulation which form the two interrelated parts of atmospheric dynamics in the region of the …
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Limb scatter measurements of high altitude cloud distributions
… chemical, and radiative processes within 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 …
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Observation of New Particle Formation in the Northern Hemisphere at Altitude from 4 to 20 km
… mixing ratio values of CO increased within the upper troposphere layer before/during NPF events, which may serve as an indicator of occurring the nucleation bursts if the other required conditions of NPF occurrence were existing. As examples, within the tropics, SO2 can be transported from the …
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Observational study of the monsoonal dynamics and eddy shedding phenomena
We analyze atmospheric data in order to study the upper tropospheric dynamics in the area of the Asian summer monsoon. We look at summers of four years from 1987 to 1990. The divergent upper tropospheric circulation of the monsoon often adopts the form of a unified large-scale vortex. However, when …
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A numerical study of barotropic instability of a zonally varying easterly jet.
… resemble those observed in the vicinity of the upper troposphere easterly jet during the summer monsoon.
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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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Sensitivity of tropospheric chemistry to the source of NO x from lightning : sensitivity simulations with the global 3D chemistry model for atmospheric transport and chemistry MATCH-MPIC
… the largest enhancements occur in the tropical upper troposphere, where lifetimes of most trace gases are longer and where they thus become more susceptible to long-range transport by large-scale circulation patterns. Comparison with observations indicate that the 0 and 20 Tg/yr(N) production …
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Understanding the chemistry of atmospheric particles using single particle mass spectrometry
… profiles of bioaerosol from near-surface to the upper troposphere.
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A numerical model study about the impacts of dry air on tropical cyclone formation
… lateral dry air entrainment and transient upper-level dry air intrusion. Backward trajectory analysis and water budget analysis show that vertical transport of dry air from the upper troposphere, where a well-defined wave pouch is absent, contributes to mid-level drying near the pouch …
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