TY - JOUR A1 - Hõrrak, U. A1 - Aalto, P. P. A1 - Salm, J. A1 - Komsaare, K. A1 - Tammet, H. A1 - Mäkelä, J. M. A1 - Laakso, L. A1 - Kulmala, M. T1 - Variation and balance of positive air ion concentrations in a boreal forest JO - Atmos. Chem. Phys. J1 - ACP VL - 8 IS - 3 SP - 655 EP - 675 Y1 - 2008/02/12 PB - Copernicus Publications SN - 1680-7324 UR - https://acp.copernicus.org/articles/8/655/2008/ L1 - https://acp.copernicus.org/articles/8/655/2008/acp-8-655-2008.pdf DO - 10.5194/acp-8-655-2008 ER -