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Phosphorus is added to a marine system via fertilizer runoff, Limiting…
Phosphorus is added to a marine system via fertilizer runoff
Eutrophication - algae overgrowth, particularly cyanobacteria (blue-green algae)
BOD increases and DO in ocean water decreases as algae and other plants die and are decomposed by aerobic bacteria
eutrophication can cause harmful algal blooms. They can poison animals (red and brown tides) as well as outcompete other organisms, such as other algae, seagrasses and corals (green tides).
Dissolved PO4^3+ concentration increases
Limiting nutrients of primary production in surface waters
inorganic nitrates
inorganic phosphorus
iron
silica
Volcanic islands and hydrothermal vents are formed as a result of tectonic activity
Coral reefs form due to warming of ocean water in surrounding areas, reefs form a fringe around these islands
Reef continues to grow as volcanic island erodes, leading to the formation of a barrier reef and then an atoll (Darwin's reef classification).
if the reef doesn't grow fast enough and falls into the aphotic zone, it will die and become a guyot (a sunken reef associated with a seamount).
Volcanic ash and other deposits have been found to release nutrients and impact ocean chemistry in a number of ways
Nutrients released by volcanic activity: Fe, Si, N, P
Deposition of volcanic ash onto ocean surface has been found to increase Fe concentrations
CO2 enters the ocean from the atmosphere, becoming a dissolved gas
combines with water and carbonate
2 bicarbonate ions form