The dynamics of the Earth's magnetosphere is strongly influenced by the solar wind. Sudden changes in the solar wind such as dynamic pressure pulses or interplanetary shocks impacting the magnetosphere are ideal for the study of magnetohydrodynamics (MHD) wave energy transfer fr…
"159" Result
Sort By:
A procura e utilização de Fontes de Energia Renovável (FER) tem tido um crescimento elevado nos últimos anos, concentrado nos centros eletroprodutores do país, como os parques eólicos. Este crescimento levou a que Portugal atingisse o limite de capacidade para esta energia onsho…
This study investigates the orographic effects of the New Guinea Mountains on the eastward propagation of the Madden-Julian Oscillation (MJO) and the rainfall associated with it during the strong 2007-08 event (MJO07-08). The eastward propagation of the MJO has been observed in …
Mineral dust and aerosols can directly and indirectly influence shortwave and longwave radiative forcing. In addition, it can cause health hazards, loss of agricultural soil, and safety hazards to aviation and motorists due to reduced visibility. Previous work utilized satellite…
In the context of the SERVIR-Africa project, the SERVIR Arizona Team is developing streamflow forecast systems on African basins using Satellite Precipitation Products (SPP) to drive the models. These products have errors that need to be addressed before using them to drive hydr…
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…
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…