New analysis of diurnal and seasonal variations in fair-weather atmospheric potential gradient and cloud condensation nuclei measured in S. Kalinowski Geophysical Observatory in Świder, Poland

The ground-level atmospheric potential gradient (PG) has been measured with a radioactive collector method in Stanislaw Kalinowski Geophysical Observatory in Świder, Poland, for several decades. The observations have been previously analysed by Kubicki et al. (ICAE 2003, ICAE 2007) revealing rather typical behaviour in the diurnal and seasonal variations of the PG of a land station controlled by pollution. Electric field measurements at such station usually show a maximum at local winter months which are mostly affected by anthropogenic pollution. The whole series has been newly analysed to describe the Świder PG variations in greater detail, also in connection with an analysis of simultaneous measurements of cloud condensation nuclei. Fair-weather potential gradient course is calculated in different time scales (annual, seasonal and diurnal) with taking into account local meteorological and air pollution conditions. An attempt is made to calculate the diurnal and seasonal variations at very low cloud condensation nuclei counts. The work is supported by Poland National Science Centre grant no 2021/41/B/ST10/04448.