Pablo E Saide, Laura H Thapa, Xinxin Ye, Demetrios Pagonis, Pedro Campuzano-Jost, Hongyu Guo, Melinda L Schuneman, Jose-Luis Jimenez, Richard Moore, Elizabeth Wiggins, Edward Winstead, Claire Robinson, Lee Thornhill, Kevin Sanchez, Nicholas L Wagner, Adam Ahern, Joseph M Katich, Anne E Perring, Joshua P Schwarz, Ming Lyu, Christopher D Holmes, Johnathan W Hair, Marta A Fenn, Taylor J Shingler
Aerosol mass extinction efficiency (MEE) is a key aerosol property used to connect aerosol optical properties with aerosol mass concentrations. Using measurements of smoke obtained during the Fire Influence on Regional to Global Environments and Air Quality (FIREX-AQ) campaign we find that mid-visible smoke MEE can change by a factor of 2-3 between fresh smoke (<2 hr old) and one-day-old smoke. While increases in aerosol size partially explain this trend, changes in the real part of the aerosol refractive index (real(n)) are necessary to provide closure assuming Mie theory...
September 28, 2022: Geophysical Research Letters