Evidence continues to mount for an important role for iodine in gas- and aerosol-phase chemistries within the marine boundary layer or MBL (Kolb, 2002; von Glasow, 2005). Whilst episodic ‘bursts’ of iodine oxide particles (IOP’s) in coastal areas have been relatively well documented (O’Dowd and Hoffmann, 2005), their formation in other environments remains to be confirmed. However, the recent detection of gas-phase iodine oxide precursors to particle formation in the Antarctic (Saiz-Lopez et al., 2007) suggests a more wide-scale nature for this aerosol species. In all environments, the particle formation mechanism is inextricably linked to the biological release of iodine-containing gases (e.g., I₂ and CH₂I₂) in response to a variety of stress-induced situations (Carpenter, 2003).