Impacts of aerosol particles on the microphysical and radiative properties of stratocumulus clouds over the southeast Pacific Ocean by Twohy, C, Anderson, JR, Toohey, D, Andrejczuk, M, Andrejczuk, M, Adams, A, Lytle, M, George, R, Wood, R, Saide, P, Spak, S, Zuidema, P, Leon, D