TY - JOUR A1 - Bister, M. A1 - Kulmala, M. T1 - Anthropogenic aerosols may have increased upper tropospheric humidity in the 20th century JO - Atmos. Chem. Phys. J1 - ACP VL - 11 IS - 9 SP - 4577 EP - 4586 Y1 - 2011/05/13 PB - Copernicus Publications SN - 1680-7324 UR - https://acp.copernicus.org/articles/11/4577/2011/ L1 - https://acp.copernicus.org/articles/11/4577/2011/acp-11-4577-2011.pdf DO - 10.5194/acp-11-4577-2011 ER -