The secondary organic aerosol (SOA) formation potential of isoprene has been investigated with a regional scale climate model REMOTE. The focus was on the contribution of isoprene oxidation products to marine aerosol over the Northeast Atlantic. As a first stage of the work, the aerosol dynamic module of REMOTE, M7, was extended to treat the SOA formation. In addition, an isoprene source function over the oceans was included in REMOTE. The preliminary results suggest that isoprene oxidation is a potentially important source of marine aerosol over the Northeast Atlantic.