Browsing Atmospheric sciences by Title
Now showing items 10-29 of 312
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Aerosol size distribution modeling for the Pacific Northwest
(2007)The goal of this project is to more accurately model the aerosol size distribution with the Community Multiscale Air Quality modeling system (CMAQ). The approach is to compare its performance to observations in the Pacific ... -
Aerosol-cloud-precipitation interaction in ultraclean layers and optically thin veil cloud system in the stratocumulus to cumulus transition: remote sensing measurements and cloud resolving model results
Recent observational studies have shown that ultraclean layers (UCLs) and optically thin veil clouds associated with precipitating deep cumulus are common features of the marine boundary layer in the stratocumulus to cumulus ... -
An Evaluation of Simulated Microphysics over Terrain during the OLYMPEX Field Campaign
The OLYMPEX field campaign of winter 2015-2016 offers the opportunity to assess the performance of model physics over a coastal mountain range. This thesis explores precipitation and microphysics simulations, and investigates ... -
An Exploration of Factors that Affect Earth's Climate in Time
This Earth’s climate is strongly influenced by both external and internal forcings. Several examples are the Earth’s rotation rate, variations in the Earth’s orbit, and the land-sea geometry. My PhD work specifically studies ... -
An Index for Predicting Precipitation in the North Coast of Peru Using Logistic Regression
The north coast of Peru has a desert-like climate. Since precipitation is so scarce, strong convective events have a big impact on this region, especially when they are associated with an increase in sea surface temperature. ... -
An observational and theoretical study of the structure and propagation of the Madden-Julian Oscillation
This study is compososed of two parts. In the first part of this dissertation, the large-scale circulation features that determine the structure and evolution of MJO- related moisture and precipitation fields are examined ... -
Analysis of new observational datasets relating to the organization and dynamical impacts of tropical convection
(2013-04-17)Deep convection is a major heat source in the tropical atmosphere, driving circulation cells that are an important aspect of Earth's climate. The environmental conditions that modulate the occurrence of lightning, which ... -
An Analysis of the Structure and Dynamics of Inner Core Precipitation Features in a Tropical Cyclone
(2013-04-17)Airborne Doppler radar observations of the stationary rainband complex and secondary eyewall in Hurricane Rita (2005) were analyzed to better understand the inner-core dynamics of tropical cyclones. In the upwind end of ... -
Annular modes in the atmospheric general circulation
(2000)The leading modes of variability of the extratropical circulation in both hemispheres are characterized zonally symmetric or "annular" structures. Whereas the structure and dynamics of the Southern Hemisphere (SH) annular ... -
Antarctic Elevation Drives Hemispheric Asymmetry in Polar Lapse Rate Climatology and Feedback
The lapse-rate feedback is the dominant driver of stronger warming in the Arctic than the Antarctic in simulations with increased CO2. While Antarctic surface elevation has been implicated in promoting a weaker Antarctic ... -
Antarctic sea ice response to weather and climate modes of variability
The relationship between climate modes and Antarctic sea ice is explored by separating the variability into intraseasonal, interannual, and decadal time scales. Cross spectral analysis shows that geopotential height and ... -
The applicability of hydraulic theory to gap winds observed in the Wipp Valley
(2005)A well documented shallow foehn and gap flow case in the Wipp valley in Austrian Alps from 20 Oct 1999 provided an excellent opportunity to examine the applicability of the Reduced Gravity Shallow Water (RGSW) model to ... -
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 ... -
Assimilation of lightning data by nudging tropospheric water vapor and applications to numerical forecasts of convective events
A lightning data assimilation technique is developed for use with observations from the World Wide Lightning Location Network (WWLLN). The technique nudges the water vapor mixing ratio toward saturation within 10 km of a ... -
Assimilation of Time-averaged Pseudoproxies for Climate Reconstruction
(2013-07-23)We examine the efficacy of a novel ensemble data assimilation (DA) technique in climate field reconstructions (CFR) of surface temperature. We perform four pseudoproxy experiments with both general circulation model (GCM) ... -
Asymmetric Patterns in the Atmosphere and Sea Ice During Polar Cyclones and Their Changes Under Global Warming
The spatial structure of polar cyclones is often considered to be largely symmetrical and distinct from that of midlatitude cyclones, however we use ERA5 reanalysis and a cyclone-centered compositing method to show that ... -
Atmospheric classification as a cloud and precipitation evaluation tool in models and observations
Atmospheric classifications are created for two regions using an automated clustering technique first described in Marchand et al. 2009. This method applies an iterative clustering algorithm to regional snapshots of dynamic ... -
The atmospheric energy constraint on precipitation change
(2014-02-24)How does rain change with global warming? This dissertation investigates the rate of global-mean precipitation increase, changes in atmospheric radiative cooling, and the changes in frequency and intensity of rain events. ... -
Atmospheric Heat Transport: Variability, Trends, and the Role of Orography
Atmospheric heat transport (AHT) plays a key role role in Earth’s climate. It helps moderate the equator to pole temperature gradient and is instrumental in Earth’s hydrologic cycle. Despite this importance, there are ... -
Atmospheric predictability is insensitive to the slope of the background kinetic energy spectrum
The sensitivity of atmospheric predictability to the slope of the background kinetic energy (KE) spectrum is investigated by adding low-level potential temperature perturbations of varying scales and amplitudes to ...