摘要: Iodine was discovered as a new element two centuries ago. It is essential to human health, yet substantial proportion of the world's population are at risk from lack dietary iodine. Natural processes within oceans responsible for majority atmospheric In lower atmosphere, iodine undergoes complex array photochemical reactions that lead ozone destruction and, in some cases, particle formation, before being scavenged by aerosol. The nature and mechanisms oceanic emissions still uncertain.