Atmospheric CO2 observations at Finnish urban and rural sites

作者：Kilkki Juho^*; Aalto Tuula; Hatakka Juha; Portin Harri; Laurila Tuomas

来源：Boreal Environment Research, 2015, 20(2): 227-242.

Four new ground-based atmospheric monitoring stations in Finland were examined for local and large-scale signals in carbon dioxide mole fraction, and the results were compared with the corresponding values obtained from WMO/GAW site Pallas, northern Finland and NOAA/ESRL marine boundary layer reference time series. The measurements were filtered with knowledge of local weather and air composition. Periods of a presumably well-mixed boundary layer and relatively pollutant-free air were close to the Pallas time series in mole fraction, particularly in the winter. Wintertime mole fractions were 5-10 ppm higher than the signal in the marine boundary layer at all stations. The seasonal amplitude was 18-24 ppm, and diurnal amplitude was 0-3 ppm in winter and 3-20 ppm in the summer months. All stations, with the possible exception of the urban site in Helsinki, showed potential for observing a large-scale carbon dioxide signal.

• 出版日期2015-4-30