it is very important to determine the stable nitrogen isotope ratio for the nitrogenous substances in aerosols and the geochemistry behavior of stable nitrate ion isotopes in aerosols in order to elucidate the chemical and physical functions of clouds. hence, aerosol field sampling was conducted in the skies offshore from malibu beach and santa barbara, california, u.s.a. on 16 and 18 july 2009...

The long-term goal is to extend our predictive skill for mesoscale meteorology and to use that meteorology to improve prediction for the transport of aerosols and gases. We recognize the need of the Navy to have predictions of mesoscale weather for operations, of tropospheric aerosol conditions for both operations and weapons systems, and of Chemical and Biological Weapons (CBW) conditions for ...

The evolution in time of a nanoparticle (NP) aerosol released into a simulated workplace environment was investigated for different starting scenarios including (i) NP release into a particle-free atmosphere and (ii) release in presence of a pre-existing background aerosol. In each case, particle number distributions and total number concentrations in a 2 m(3) aerosol chamber were monitored ove...

Based on the field studies of biomass burning plumes in Alaska, we hypothesized that potassium (K) may be significantly scavenged, during wood stove burning, as deposits inner wall chimney where temperature decreases with height. To test this hypothesis, analyzed deposit samples collected from a (6 m long) for measurement major ions and anhydrosugars including levoglucosan (Lev). Concentrations...

When bacteria are disseminated into air, the concentration of viable cells in the aerosol decreases with time. It has been shown that part of this loss is due to impingement of cells on the surfaces of the container and to settling, but there is also considerable evidence for biological inactivation (Lester, 1948; Dunklin and Puck, 1948; Boyd and Forstat, 1953). This study has been undertaken t...

Aerosols are among the most important of atmospheric pollutants observed like the microscopic particulate matter in the lower parts of the troposphere. The main purpose of this study is introducing a new method based on satellite images processing results and nonlinear analysis (fractal based) to investigate the origin and dynamical mechanism of aerosols distribution in North Africa and the Mid...