We have many times seen references to iodine in our environments and food. At the time, I have sometimes given very brief answers - not having suitable links to hand. This time, however, I have two links - one focussing on air/sea exchange, the other on the wider issues of iodine distribution. So I have decided to make a post of it.
As with everything in the thyroid world, what initially might appear fairly simple rapidly becomes very complicated. Even so, a browse through the pictures might give some idea. (No - I have not read every word!)
The geochemistry of iodine and its application to environmental strategies for reducing the risks from iodine deficiency disorders
Air-Sea Exchange of Iodine - Summary
If you are interested, both of these links lead on to other links... You won't be short of reading material for a while.
Image is taken from the BGS paper.