TY - JOUR A1 - Kvalevåg, M. M. A1 - Myhre, G. A1 - Lund Myhre, C. E. T1 - Extensive reduction of surface UV radiation since 1750 in world's populated regions JO - Atmos. Chem. Phys. J1 - ACP VL - 9 IS - 20 SP - 7737 EP - 7751 Y1 - 2009/10/19 PB - Copernicus Publications SN - 1680-7324 UR - http://www.atmos-chem-phys.net/9/7737/2009/ L1 - http://www.atmos-chem-phys.net/9/7737/2009/acp-9-7737-2009.pdf DO - 10.5194/acp-9-7737-2009 ER -