I know @griteateris aware of this, but its important not to generalize the impact of volcanic eruptions in much the same manner that we used to ENSO, as they come in all shapes, sizes and locales...they have varying impact depending upon the location, global circulation pattern, substances emitted, etc. Assuming a ++AO/NAO as followed Pinatubo just because we had a recent eruption is akin to assuming that every el nino will behave like a modoki and we know how much @snowman19would appreciate that.