Pallas-Sodankylä Observatory of Finnish Meteorological Institute (FMI) consists of versatile research infrastructure for monitoring and studying the atmosphere, ecosystems and their interactions. FMI has a long history of atmospheric monitoring at Pallas. The first weather station was established near Lake Pallasjärvi in 1935. In 1991, the measurements of atmospheric composition were started and in 1994 the Sammaltunturi station was established as a node of the Pallas–Sodankylä Global Atmosphere Watch (GAW) station. Currently, Pallas comprises one of the most important research infrastructures in Finland and in the wider circumpolar region, contributing to numerous European and global research programmes, such as GAW, ICOS, ACTRIS and EMEP.
A wide range of top-class research encompassing multiple disciplines is conducted at the various research stations and measurement sites established within the Pallas area by the FMI. The main research themes include greenhouse gas concentrations and ecosystem–atmosphere fluxes, the climate effects of atmospheric aerosols, aerosol–cloud interactions and air quality. Pallas is one of the sites of the Finnish network for monitoring the concentrations of mercury and other heavy metals, benzo(a)pyrene, ozone and other air pollutants, as required by the European legislation on ambient air quality. Pallas also serves as a platform for scientific collaboration with international as well as national research institutes (LUKE, SYKE, University of Oulu and GTK).
Sodankylä site hosts programs exploring upper-air chemistry and physics, atmospheric column measurements, snow and soil hydrology, biosphere-atmosphere interaction and satellite calibration-validation studies. Arctic Space Centre at Sodankylä hosts also the main infrastructure of FMI for Earth Observation satellite data reception, storage and distribution.
SYKE conducts at Pallasjärvi and its catchment long-term hydrological, chemical and biological monitoring at lake and stream/river stations using manual sampling and continuous automatic measurements. The main studies utilizing these measurements include air pollution effects on ecosystems, climate change, interactions between these global pressures, and changes in hydrological processes and biogeochemical cycling of substances – particularly C and N - in the catchment and the lake itself. SYKE has built research and monitoring infrastructure particularly in Lompolojänkkä subcatchment with FMI, Luke and University of Oulu for automatic runoff, dissolved organic material and other water chemistry measurements.