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A study of aerosol indirect effects for cumulus clouds on a global scale
(2008-07-26)
Using case study approach my investigation on aerosol's effects on fair weather cumulus clouds shows that not only can aerosol reduce cloud droplet sizes like in the case of stratiform clouds, but also they can increase ...
Pacific Sea Surface Temperatures in the Twentieth Century: Variability, Trend, and Connections to Long-Term Hydroclimate Variations Over the Great Plains
(2008-11-11)
Pacific sea surface temperatures (SSTs) exhibit variability on interannual to centennial time scales. This dissertation addresses the challenge to separate SST natural variability from the nonstationary (largely anthropogenic) ...
GLOBAL SCALE AEROSOL PROPERTIES: IMPLICATIONS FOR SURFACE SHORTWAVE RADIATION BUDGET
(2005-12-01)
Aerosols are known to affect the shortwave radiation budget of the Earth-atmosphere system. Using truncated Empirical Orthogonal Functions (EOF) fitting, we derive monthly mean aerosol optical depth (AOD) at 0.55 μm ...
Local ensemble transform Kalman filter with realistic observations
(2007-08-03)
The main goal of my research is to improve the performance of the EnKF in assimilating real observations in order to accelerate the development of EnKF systems towards operational applications. A Local Ensemble Transform ...
Variability of terrestrial carbon cycle and its interaction with climate under global warming
(2008-08-04)
Land-atmosphere carbon exchange makes a significant contribution to the variability of atmospheric CO2 concentration on time scales of seasons to centuries. In this thesis, a terrestrial vegetation and carbon model, ...
The Assimilation of Hyperspectral Satellite Radiances in Global Numerical Weather Prediction
(2008-04-29)
Hyperspectral infrared radiance data present opportunities for significant improvements in data assimilation and Numerical Weather Prediction (NWP). The increase in spectral resolution available from the Atmospheric ...
High-Resolution Clouds and Radiative Fluxes from Satellites: Transferability of Methods and Application to Monsoon Regions
(2009)
High-resolution information on clouds and radiative fluxes is produced for the Indian and African monsoon regions of interest to the GEWEX Project as articulated under the Coordinated Energy and Water Cycle Observations ...
Carbon cycle data assimilation using a coupled atmosphere-vegetation and the Local Ensemble Transform Kalman Filter
(2009)
We develop and test new methodologies to best estimate CO2 fluxes on the Earth's surface by assimilating observations of atmospheric CO2 concentration, using the Local Ensemble Transform Kalman Filter. We perform Observing ...
Air Pollution Response to Changing Weather and Power Plant Emissions in the Eastern United States
(2008-11-20)
Air pollution in the eastern United States causes human sickness and death as well as damage to crops and materials. NOX emission reduction is observed to improve air quality. Effectively reducing pollution in the future ...
investigations into the nature, severity, and impact of pyrocumulonimbus
(2008-05-02)
Pyrocumulonimbus (pyroCb) storms have been shown to have an eruptive dynamic and capacity similar to volcanic eruptions that penetrate into the stratosphere. Much remains unknown about pyroCb, for instance its storm ...