Observations of nighttime new particle formation in the troposphere

Observations of nighttime new particle formation in the troposphere

[1] We present atmospheric observations which indicate efficient new particle formation during the nighttime in the troposphere under low condensation sinks, in contrast to the current prevailing assumption that aerosol nucleation takes place only during the daytime and typically from sulfuric acid. High concentrations of ultrafine particles with diameters from 4 to 9 nm ( 1000 cm ) were measur...

New particle formation in the remote troposphere : A comparison of observations at various sites

Measurements show that new particles are formed by homogenous nucleation over a wide range of conditions in the remote troposphere. In our studies, large nucleation events are found exclusively in regions of enhanced sulfuric acid vapor (H2SO4g) concentrations, with maximum concentrations never exceeding 5x107 molecules cm '3. Although these data suggest that H2SO4g participated, comparisons be...

The Effects of Airmass History on New Particle Formation in the Free Troposphere: Case Studies

Recent aircraft studies showed that new particle formation (NPF) is very active in the free troposphere. And, these observations lead to a new question: when does NPF not occur? Here, we provide case studies to show how different meteorological parameters affect NPF in the upper troposphere, using the aerosol size distributions measured at latitudes from 18 N–52 N and altitudes up to 14 km duri...

When does new particle formation not occur in the upper troposphere?

formation and evolution of regional organizations: the case study of the economic cooperation organization (eco)

abstract because of the many geopolitical, geo economical and geo strategically potentials and communicational capabilities of eco region, members can expand the convergence and the integration in base of this organization that have important impact on members development and expanding peace in international and regional level. based on quality analyzing of library findings and experts interv...