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Observations Of Fire Behavior On A Grass Slope During A Wind Reversal, Dianne Hall
Observations Of Fire Behavior On A Grass Slope During A Wind Reversal, Dianne Hall
Master's Theses
This experiment studied fire-atmospheric interactions and wildland fire behavior on a slope. A grass slope was instrumented with both in situ and remote instruments to record both meteorological conditions and the fire behavior. A headfire was lit and allowed to burn upslope through the instruments. The data collected were analyzed to determine the fire behavior, specifically fire spread (direction and rate) and flame characteristics (length, height, and angle). During the first several minutes of the experiment, fire behavior was as expected with an upslope rate of spread at 0.1 m s-1 and flame lengths between 1 m and 4 m. …
Evaluating Tropical Tropospheric Ozone And Water Vapor In Merra-2, Era-Interim, And Cam-Chem Using Aircraft Observations From The Western Pacific, Kathryn Steinmann
Evaluating Tropical Tropospheric Ozone And Water Vapor In Merra-2, Era-Interim, And Cam-Chem Using Aircraft Observations From The Western Pacific, Kathryn Steinmann
Master's Theses
Tropospheric ozone (O3) negatively is a greenhouse gas, affecting global climate. To improve climate predictions, the behavior of O3 and the mechanisms affecting its distribution must be understood and accurately represented in model simulations. This study evaluates O3 and water vapor (H2O) observations from the Convective Transport of Active Species in the Tropics (CONTRAST) campaign with data from the National Center for Atmospheric Research’s (NCAR) Community Atmospheric Model with Chemistry (CAM-Chem), the Modern-Era Retrospective Analysis for Research and Applications version 2 (MERRA-2), and the European Centre for Medium-Range Weather Forecast (ECMWF) Re-Analysis-Interim (ERA-Interim). In the tropical middle troposphere, CAM-Chem shows …
Numerical Simulations Of Atmospheric Rivers And The Rain Shadow Over The Santa Clara Valley, Jesse Dalton Behringer
Numerical Simulations Of Atmospheric Rivers And The Rain Shadow Over The Santa Clara Valley, Jesse Dalton Behringer
Master's Theses
This study investigated precipitation distribution patterns in association with atmospheric rivers (ARs). The Weather Research and Forecasting (WRF) model was employed to simulate two strong atmospheric river events. The precipitation forecasts were highly sensitive to cloud microphysics parameterization schemes. Thus, radar observed and simulated Z_H and Z_DR were evaluated to provide information about the drop-size distribution (DSD). Four microphysics schemes (WSM-5, WSM-6, Thompson, and WDM-6) with nested simulations (3 km, 1 km, and 1/3 km) were conducted. One of the events mostly contained bright-band (BB) rainfall and lasted less than 24 h, while the other contained both BB and non-bright-band …
Comparisons Of Upper Tropospheric Ozone At A Coastal And Urban Site And The Impact Of Local Surface Emissions, Chloe Anne Gore
Comparisons Of Upper Tropospheric Ozone At A Coastal And Urban Site And The Impact Of Local Surface Emissions, Chloe Anne Gore
Master's Theses
This study quantified the impact of urban emission sources on the enhancement of ozone (O3) in the troposphere using data from simultaneous ozonesonde launches at Half Moon Bay (HMB), CA and San Jose (SJ), CA on eleven dates in July and August 2018. The urban O3 enhancement in the SJ vertical profile was derived by subtracting out HMB, which represents baseline O3, from the SJ profile. This enhancement was averaged into 1 km layers and statistically analyzed with surface emission concentration data from three locations in SJ, however this did not reveal any discernable trends between the surface and O3 …
Asian Long-Range Transport In Relation To Atmospheric Rivers In Northern California, Catherine Liu
Asian Long-Range Transport In Relation To Atmospheric Rivers In Northern California, Catherine Liu
Master's Theses
The study investigated the effect of aerosol long-range transport on precipitation over northern California during atmospheric river (AR) events in the 2017 cold season (January-April). ARs in 2017 were among the strongest to date and the intense precipitation associated with the ARs resulted in flooding, destruction of property, and contamination of water supplies. The aerosol optical depth (AOD) from Moderate Resolution Imaging Spectroradiometer (MODIS) data showed Asian dust traveling across the northern Pacific Ocean along with AR events. Aerosol measurements in California, provided by the Interagency Monitoring of Protected Visual Environments (IMPROVE), showed that more Asian dust tends to be …
Mesoscale Controls On The Shasta County Convergence Zone, Matthew Thomas Roberts
Mesoscale Controls On The Shasta County Convergence Zone, Matthew Thomas Roberts
Master's Theses
The Shasta County Convergence Zone (SCCZ) is a poorly understood terrain-forced convergence zone that develops at the northern terminus of California’s Sacramento Valley during cool season (Oct.-Apr.) trough passages. While terrain-flow interactions clearly factor into the SCCZ development, the nature of these interactions is unknown as are the mesoscale processes affecting event duration and orientation. Level-II NEXRAD radar data are used to examine the onset, duration, orientation, geographical extent, and precipitation rate of 23 SCCZ events during the 2016-2017 cool season. The analyses reveal distinct event morphologies including (1) isolated convective bands over the topography, (2) isolated convective bands displaced …