Observational evidence of a changing aerosol radiative forcing trend

Stuart Jenkins1, Trude Storelvmo2, Graeme L Stephens3, Philip Stier1, Roy Gordon Grainger4 and Myles Robert Allen5, (1)University of Oxford, Department of Physics, Oxford, United Kingdom, (2)University of Oslo, Physics, Oslo, Norway, (3)Jet Propulsion Laboratory, Pasadena, CA, United States, (4)University of Oxford, Sub-Department of Atmospheric, Oceanic and Planetary Physics, Oxford, United Kingdom, (5)University of Oxford, ECI/School of Geography and the Environment, Oxford, United Kingdom