Ambient hydrogen concentration measurements will be started at Sammaltunturi station during spring 2006.
A new station, Lompolojänkkä, was built and taken into use in March 2005. Lompolojänkkä is a subarctic aape mire (wetland), and measurements at the station include CO2 and CH4 fluxes with eddy covariance technique, and CO2 and CH4 concentrations at two heights.
A GC system for in-situ measurement of CH4, CO, N2O and SF6 was installed at Sammaltunturi station in February 2004.
A new station, Kenttärova, was taken into use in December 2002. The station lies at elevation of 347 m a.s.l., 1.4 km south of the Matorova station. The 20 m high measurement tower is situated in a Norway spruce forest. Carbon dioxide and energy fluxes are measured at the station using eddy covariance technique. Extensive set of additional meteorological measurements are also conducted at the site. The instrumentation from Pallasjärvi forest weather station was moved to the Kenttärova, and Pallasjärvi station's operation was discontinued.
The measuring station for climatically active species, Sammaltunturi, has been rebuilt during 2001. The old station building was small, having only 36 m2; the new building has 120 m2. This makes it possible to extend continuous measurement programme, and also short-term measuring campaigns. Move to the new station took place in July 2001, and the official opening ceremony was held in September 12, 2001.
The aerosol measurement programme has been extended with parallel aerosol size distribution measurements on Sammaltunturi and Matorova with DMPS (Differential Mobility Particle Sizer) since April 2000. The Matorova DMPS was moved to Sammaltunturi for comparison purposes in February 2002, and in March 2002 to Laukukero station. A 3-Wavelenght nephelometer measuring light scattering properties of aerosols has been operating since February 2000.