PT Journal AU Yatavelli, RLN Mohr, C Stark, H Day, DA Thompson, SL Lopez-Hilfiker, FD Campuzano-Jost, P Palm, BB Vogel, AL Hoffmann, T Heikkinen, L Aljälä, M Ng, NL Kimmel, JR Canagaratna, MR Ehn, M Junninen, H Cubison, MJ Petäjä, T Kulmala, M Jayne, JT Worsnop, DR Jimenez, JL TI Estimating the contribution of organic acids to northern hemispheric continental organic aerosol SO Geophysical research letters PY 2015 BP 6084 EP 6090 VL 42 DI 10.1002/2015GL064650 LA english ER