Measurements of aerosol size distributions with a pocket counter with variable expansion ratio

The vertical profile of condensation nuclei on cloudy days

The Deposition of Aerosol Particles in a Forest Using an Atmospheric Residence Time Model

Usually forests are expected to act as a “filter” for aerosols. This term and the interpretation of earlier observations triggered the thoughts and calculations of this paper. The results indicate that the forest better should be termed “sink” rather then “filter”. The efficiency of a forest to remove particles from the air most probably is caused by the time the aerosol spends in the forest to settle and coagulate. The value of a forest for unpolluted air to the community stems from the fact that on the location of a forest, no polluter is existing. Based on a residence time model of the atmosphere, a model for the forest is developed and compared with published results.

Physical Aspects of the Atmospheric Aerosol

The atmospheric aerosol is a trace substance of the troposhere as well as the trace gases. Therefore a number of similiarities should be expected. As an example a common model on residence time is developed and discussed in its results. The residence time connects the content of a reservoir (size distribution for aerosols) with its source strength or removal rate. This is presented for the aerosol. In addition other physical properties of the tropospheric aerosol like optical, electrical and water uptake properties are discussed.

Experimental Verification of the Determination of Atmospheric Turbidity from Sunshine Recorders

Abstract The feasibility of determining atmospheric turbidity from the burned traces of Campbell-Stokes sunshine recorders during cloudless sunsets and sunrises is examined experimentally. Results show that atmospheric turbidity can be determined in this way and can provide data for climatological research over the period of existing sunshine records. However, the measurements show a substantial uncertainty in the results if the properties of the used record cards are unknown. For networks of recorders, the method remains useful despite these limitations.