Magnuz Enghardt, Stockholm Stad,  Miljöförvaltningen, SLB-analys


Contemporary observations of wet deposition to Sweden 1955-2017


A unique data set, compiled from monthly precipitation chemistry samples collected from 1955 onwards, is presented. The data originate from successive multi-station networks and have been controlled and merged to construct an unbroken series of the wet deposition of acidifying and eutrophying species to Sweden spanning 63 years.

The presented data is likely the most comprehensive mapping of observed wet deposition ever published and, due to its great temporal and spatial coverage, it largely reflects the emissions and depositions of anthropogenic sulphur and nitrogen in Europe.

Our presentation sets out to describe the utilised precipitation chemistry networks and how the data has been analysed. We also present observed trends in the wet deposition of sulphur- and nitrogen containing species to Sweden over the period 1955 through 2017. The period is interesting as it encompasses a phase with clearly increasing depositions followed by a new regime with decreasing depositions.

Nss-sulphate wet deposition to Sweden is now less than 15% of its maximum values around 1970. Ammonium and nitrate deposition peaked later, in the mid-1980s, and have now decreased to 60-70% of their maximum values.

Our data reveals that while nss-sulphate deposition is now less than in mid-1950, are both ammonium and nitrate deposition significantly higher than when our observations begun, in the mid-1950. This illustrates that the nitrogen cycle in Europe is still significantly perturbed despite recent improvement in reducing European NOx-emissions.


Thursday April 25, 14:15


Rossbysalen C609, Arrhenius laboratory, Svante Arrhenius väg 16C, 6th floor