Defenses Fall 2012Spring 2012 | Spring 2013
Remote Continental Aerosol Characteristics in the Rocky Mountains of Colorado and Wyoming
December 13, 2012
The Rocky Mountains of Colorado and Wyoming enjoy some of the cleanest air in the United States, with few local sources of particulate matter or its precursors apart from fire emissions, windblown dust, and biogenic emissions. However, a...
A Simple Parameterization of Aerosol Emission in RAMS
December 7, 2012
Throughout the past decade, a high degree of attention has been focused on determining the microphysical impact of anthropogenically enhanced concentrations of Cloud Condensation Nuclei (CCN) on orographic snowfall in the mountains of th...
The Impacts of Mineral Dust on Organized Mesoscale Deep Convection
October 26, 2012
The overarching goal of this dissertation research is to investigate how mineral dust impacts various aspects of organized deep moist convection (DMC) using numerical modeling. From a bulk perspective, organized mesoscale DMC can be char...
Investigation Into a Displacement Bias in Numerical Weather Prediction Models' Forecasts of Mesoscale Convective Systems
October 26, 2012
Although often hard to correctly forecast, mesoscale convective systems (MCSs) are responsible for a majority of warm- season, localized extreme rain events. This study investigates displacement errors often observed by forecasters and r...
Ensemble-Based Analysis of Extreme Precipitation Events from 2007-2011
October 19, 2012
From 2007 to 2011, 22 widespread, multiday rain events occurred across the United States. This study will conduct numerical model evaluation of three ensemble prediction systems â€“ the European Centre for Medium-Range Weather Fore...
Using Total Precipitable Water Anomaly as a Forecast Aid for Heavy Precipitation Events
Lance Vanden Boogart
October 18, 2012
Heavy precipitation events are of interest to weather forecasters, local government officials, and the Department of Defense. These events can cause flooding which endangers lives and property. Military concerns include decreased traffic...
Development of a Polarimetric Radar Based Hydrometeor Classification Algorithm for Winter Precipitation
September 28, 2012
The nation-wide WSR-88D radar network is currently being upgraded for dual-polarized technology. While many convective, warm-season fuzzy-logic hydrometeor classification algorithms based on this new suite of radar variables and temperat...
The Influence of Embedded Explicit Convection on Simulations of the West African Monsoon
September 6, 2012
The simulation of the West African monsoon is examined in two coupled general circulation models (CGCMs). The first model is the standard Community Climate System Model (CCSM) which uses traditional parameterizations to represent convect...
Latent Heating and Cloud Processes in Warm Fronts
August 27, 2012
The results of two studies are presented in this thesis. In the first, an extratropical cyclone that crossed the United States on April 9-11 2009 was successfully simulated at high resolution (3km horizontal grid spacing) using the Colo...
Gravity Wave and Microphysical Effects on Bow Echo Development
August 22, 2012
Numerical simulations of the 13 March 2003 bow echo over Oklahoma are used to evaluate bow echo development and its relationship with gravity wave generation and microphysical heating profile variations. The first part of the research i...
An Investigation of Ammonia and Inorganic Particular Matter in California during the CalNex Campaign
August 7, 2012
Over the last century, the rise of industrial agriculture has greatly increased the emission of ammonia (NH3) from livestock waste and synthetic crop fertilizers to the atmosphere. Ammonium (NH4) aerosol, which can...
The Impact of Pine Beetle Kill on Monoterpene Emissions and Secondary Organic Aerosol Formation in Western North America
August 7, 2012
Over the last decade, an extensive beetle outbreak has impacted western North America resulting in the mortality of over 100 km^2 of forest throughout British Columbia and the western United States. Climate change has aided the expansion...
Observations of Reactive Nitrogen Species in the Atmosphere and Nitrogen Deposition in the Rocky Mountains
July 18, 2012
Many national parks are experiencing increased nitrogen deposition due to increased emissions of reactive nitrogen, especially in the western United States. Excess nitrogen deposition can adversely impact ecosystem function, in some cas...
Aerosol Impacts on Deep Convective Storms in the Tropics: a Combination of Modeling and Observations
July 18, 2012
It is widely accepted that increasing the number of aerosols available to act as cloud condensation nuclei (CCN) will have significant effects on cloud properties, both microphysical and dynamical. This work focuses on the impacts of aer...