Long-term measurements of the vertical electrical potential gradient in the atmospheric surface layers
2007 (English)In: International conference on atmospheric electricity ICAE, 2007Conference paper (Other (popular scientific, debate etc.))
: A long series of measurements of the surface potential gradient have been made since 1962 in Sweden in the Marsta Observatory (59◦56 N; 17◦35 W) located in rural area 10 km north of Uppsala. Nearest forest is located more than 1 km from the observatory, which provides undisturbed micro-meteorological conditions. There are no industrial establishments around the observatory. A modifed atmospheric electrical station of the Kasemir–Dolezalek construction is used. During long periods other electric and meteorological parameters are measured.
The study shows that the effect of local air pollution appears essentially less than at other evaluated continental atmospheric electric stations. The diurnal variations at Marsta are well correlated with the Carnegie curve during winter and ill correlated during summer.
Our long-term measurements during the years 1962—2002 show no pronounced changes in the vertical potential gradiant in winter or during the year. Other previous long-term measurements in Europe, however, show a long-term decrease in the vertical potential gradient. The differences in the observations can be due to changes in the surroundings of the observation sites. Even local changes in the concentration of air polution can explain the differences. Baloon measurements of the ionospheric potential from 50 years measurements at different places over the globe show no long-term trend.
Place, publisher, year, edition, pages
Atmospheric electricity, current density
Meteorology and Atmospheric Sciences
IdentifiersURN: urn:nbn:se:uu:diva-14447OAI: oai:DiVA.org:uu-14447DiVA: diva2:42217