2012 年 27 巻 1 号 p. 51-61
We have developed a global simulation of secondary organic aerosol (SOA) in a chemistry-aerosol coupled climate model (MIROC-CHASER-SPRINTARS). In this study, the model considers SOA production from terpenes, isoprene, and aromatics in biogenic/anthropogenic emissions (103, 400, and 18 TgC yr-1, respectively). The simulated SOA concentrations are generally consistent with the observations in the tropics, but significantly underestimated in comparison with the observations in the mid-high latitudes in the northern hemisphere. The global SOA production is estimated at 25 Tg yr-1, mainly from isoprene oxidation with OH (～60%) and terpenes oxidation with O3 and NO3 (15 and 13%, respectively). This study also suggests that the past SOA changes due to the land use change (during the 20th century) can cause a very large positive radiative forcing (～0.4 W m-2) through direct and indirect effects.