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 15 of 15 for “"back-trajectory"”.
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Atmospheric microplastic pollution
… of microplastics of at least95km using hysplit4 back trajectory modelling. Further to this I used highvolume sampling technique to show first evidence of free-troposphericmicroplastic at an altitude of 2877masl at the Pic du Midi observatory in France.I also showed the ocean to be a source of …
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Interannual variability of summer precipitation in Texas and its implication to summer drought
… multiple linear regression analysis and back trajectory analysis were used to reveal the underlying dynamics of their linkage and causality. The results show that warming at 700 mb and surface dryness result in excessive convective inhibition (CIN), leading to precipitation deficits on a …
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The transport of PM10 over Cape Town during high pollution episodes
… module (RGC). While RMS accounts for aerosol feedbacks, RGC does not. The capability of the model (with each scheme) to reproduce the PM10 concentration and wind over Cape Town was quantified by comparing the simulations with the station observation data. To identify the paths of air parcels that …
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Modeling the impact of iIrrigation on precipitation over the Great Plains.
… from these simulations was assimilated into a back-trajectory analysis to identify where evapotranspired moisture from irrigated fields predominantly falls out as precipitation. May through September precipitation increased on average over the Great Plains by 4.97 mm (0.91%), with the largest …
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Coastal urban atmospheric mercury cycling and emissions in Boston, MA
… United States driven by meteorology. Further, back-trajectory and potential source contribution function analysis revealed oceanic re-emission of legacy deposits is a major input of Hg0 to the Boston area, but no influence from specific large anthropogenic point sources was discernible in the …
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Structure of an east coast cyclone derived from airborne radar and model diagnostics
… (WRF) Model thermodynamic fields and air-parcel back trajectories from the HYSPLIT model are used to determine causes of finescale features of a northeast U.S. cyclone and link them to synoptic and air mass structure. The storm intensified and propagated along the New England coastline on 2 …
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An Investigation of the Relationship Between Low Cloud Cover And Lower Tropospheric Stability Using MISR
… a Lagrangian view was examined by performing back trajectory analyses to determine if any time lag-correlation exists between the stability of the marine boundary layer and the cloud fraction at a given point for time lags up to 72 hours – no significant correlation was found. Using the MISR …
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Interactions Between Dust and Ecosystem, and Landscape at Multiple Scales
… influence airborne microbial assemblages. Using back trajectory analysis and dust optical depth reanalysis data, air samples impacted by African dust are identified. Seasonal variations in trajectories and associated environmental conditions reveal highly variable trans-Atlantic airflows. …
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Movement and Structure of Atmospheric Populations of Fusarium
… species collected with UAVs increased with back-trajectory distance of the sampled air. The third objective was to examine the associations between concentrations of populations of Fusarium at ground level (1 m) and in the lower atmosphere (100 m). We hypothesized that concentrations of …
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Evaluating different remote sensing techniques for detection of Saharan dust and characterisation of dust sources
… like the analysis of surface dust observations, back trajectory analysis of isobar data, and mineral tracers all tell a different story regarding the location of dust sources, they only agree that the Bodélé Depression and western Hoggar Mountains are important sources. Remote sensing techniques …
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‘Organics in ice’: Novel organic compounds in ice cores for use in palaeoclimate reconstruction
… example lipid compounds in snow layers dating back 450 years in Greenland, oxidation products of isoprene and monoterpenes in ice up to 350 years old in Alaska, and carboxylic acids and inorganic ions between 1942-1993 from Grenzgletscher (Monte Rosa Massif) in the southern Swiss Alps. Compound …
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Measurement and deduction of emissions of short-lived atmospheric organo-chloride compounds
… Data analysis combines the measurements with back trajectory information obtained from the HYSPLIT4 model (HYbrid Single-Particle Lagrangian Integrated Trajectory model, NOAA Air Resources Laboratory, Silver Springs, Maryland). Using a Kalman filter inverse method and an analytical solution of …
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Proximity to Potential Sources and Mountain Cold-trapping of Semi-volatile Organic Contaminants
… suited to monitor changes in the hemispheric background concentrations of SVOCs. A model-based exploration revealed wet-gaseous deposition as the dominant process responsible for cold-trapping SVOCs in mountain soils. Such cold trapping is particularly effective if precipitation rate increases …