Representing subgrid-scale variability is a continuing challenge for modelers, but is crucial for accurately calculating the exchanges of energy, moisture, and momentum between the land surface and atmospheric boundary layer. Soil wetness is highly spatially variable and difficu…
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Atmospheric aerosols play an important role in climate forcing, through scattering and absorption of the incoming solar radiation. The extinction of light by the presence of atmospheric aerosols was studied using two first-principle models, and corresponding computer codes. In t…
This study examines the impact of anomalous differential generation of available potential energy by absorbing aerosols on the transition and early active phases of the south Asian summer monsoon. Aerosol direct and indirect effects represent radiative forcings which can modify …
In the recent past, there are indications of changes in the surface air temperature, extreme weather events, snow and Indian summer monsoon. This thesis analyses the above weather phenomena based on observed data and climate model simulations for the present as well as the near …
Forty seven years of weekly total suspended particle filters collected at Kevo, Finland from October 1964 through 2010 by the Finnish Meteorological Institute were analyzed for near-total trace elements, soluble trace elements, black carbon (BC), and major ions and methane sulfo…
The spatiotemporal variability of cloud condensation nuclei (CCN) number concentration is investigated over the extended domain of the North African continent and Mediterranean which is an essential step for better understanding of aerosol-cloud interactions and associated clima…
This dissertation applies a global chemical transport model (GEOS-Chem) together with ground-based, aircraft, and satellite observations to quantify the sources, transport pathways, and chemical processing of tropospheric pollution in the Arctic. Asian anthropogenic emissions ar…
An accurate estimation of biomass burning emissions is in part limited by the lack of knowledge of fire burning phase (smoldering/flaming). In recent years, several fire detection products have been developed to provide information of fire radiative power (FRP), location, size, …
North Africa is one of the largest dust source regions in the world, emitting tons of dust particles that are annually transported to the atmosphere by strong winds. These dust particles may be strongly influencing the balance and the chemistry of the atmosphere and thereby has …
This study used the Low Resolution Time Series (LRTS) climatological lightning record from the space-based Tropical Rainfall Measuring Mission Lightning Imaging Sensor (TRMM, LIS) to compare individual years of lightning activity for all locations in the tropics and some in the …
Global hydroclimate has undergone significant changes over the twentieth century. Temperature and precipitation changes have not been uniform in space or time and mechanisms driving many continental changes remain to be understood. Annual-mean changes are the most often cited; i…
The ocean-atmosphere coupling can play a role in initiating and sustaining the Madden-Julian Oscillations (MJOs), which are the major intraseasonal oscillations in the atmosphere. In this thesis, the oceanic influence on MJOs is studied with reanalysis products, numerical models…
My dissertation consists of three parts. Parts . and II are focused on the climate change impacts on meteorology and air quality conditions in California (CA), while Part III is focused on the source-receptor relationship. The WRF model is applied to dynamically downscaled PCM d…
The investigation of the atmospheric fate and transport of semi-volatile organic compounds (SOCs) often requires the sampling of large volumes of air (>100 m3) in a relatively short period of time. Conventionally high-volume pumps are not suitable for remote areas without access…
The objective of this research is to investigate synoptic scale convection and its association with wave disturbances over eastern Atlantic and tropical Africa. Analyses of convection highlight a significant peak periodicity in 2-6 day time scale over the Atlantic and most of tr…
Most air quality studies have focused on sites located in either rural or urban areas. However, many regions are affected by air from both, such as the city of El Paso. Adjacent to the neighboring city of Juarez, Mexico, and in close proximity to rural areas, El Paso is affected…
Nonstationarity in the means and extremes of water resources (e.g., streamflow) due to climate change presents challenges to water resources management and planning. Changes in hydrologic variables such as streamflow critically impact infrastructure, water use planning and adapt…
La metodología de mantenimiento basado en datos se ha aplicado de forma progresiva en este trabajo, de forma que su estudio y desarrollo sirve para definir un procedimiento de aplicación computacional dentro de una línea de mantenimiento en el sector industrial. Se parte de un e…
An inquiry into atmospheric escape driven by photoionization. We begin with a brief survey of the relevant historical development of atmospheric escape, spanning from the origins of kinetic theory to the age of exoplanets. Collisional mechanisms justifying the continuum assumpti…