But do you know about the work of the late Dr.John Martin?
earthobservatory.nasa.gov/Library/Giants/Martin/martin.htmlYou see, he died too early to discover why his hypothesis of iron seeding was incorrect in that the iron was not persistent. That came later...although with Dr. Martin gone, no one wants to further the work. What happens to the iron, contrary to Dr. Martin's hypothesis, is it sinks. Yes, it rapidly sinks...under animal power in a process called vertical migration.
Vertical migration is the process of zooplankton responding to light, hiding in the depths during the day to avoid predation and rising at night to feed on phytoplankton...the same phytoplankton that were seeded by adding iron sulfate to the upper layers of the oceans.
Because phytoplankton and cyanobacteria are responsible for over 85% of all the oxygen we breathe, it stands to reason that phytoplankton are the missing carbon link. What is missing carbon? It is a mass of over half the annual anthropogenic carbon that ends up MISSING each year in the atmosphere. Yes, it is significant.
You see, Dr. Martin didn't comprehend the magnitude of vertical migration. Or the implication that it would remove the iron from the surface. And phytoplankton cannot exist except at the surface because its energy source is the sun.
Now what happens to the zooplankton when they are in the deep? They respire, digesting that zooplankton AND they secrete chitin, a material that until a few years ago, was ALSO considered "missing", just like the carbon. And yes, in the same magnitude of the missing carbon. Well, the mystery was just discovered and the chitin is no longer missing.
What happens is an anaerobic bacteria has not only a powerful enzyme but also acts as a chitin-locating colony. A bacteria that is motile is not unknown...but a colonizing bacteria that can move as a colony is something rather strange...as it can LOCATE CHITIN. Being an anaerobe, these bacteria secrete methane and at the cold temps and high pressures, forms a mineral known as a methane clathrate. This is a type of methane-water "ice"...well, it is an ice but it doesn't float. Or melt until the pressure is reduced.
Now how about iron? Well, when we had a lot of sulfates in the air from vulcanism, all the dust from the Gobi and other high deserts high in iron would combine with the sulfates, making them bioavailable. Sulfates from coal and petroleum are just as effective.
So there is a natural cycle!