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Number check: The reef system is 67 miles long. Call it 100 km.
Sunscreen use: A million people applying 1 oz (30 g) in a day = 30 million grams or 30 thousand kg. or 30 tons. So 6000 tons is a million people a day for 200 days. Not impossible.
Another view: A million people on 100 km is 10,000 people per km or 10 people per meter of shore. Seems high.
6000 tons in 100 km is 60 tons / km, or 60 kg/meter of shore. If use the same 200 days it’s 300g/meter of shore per day. 2 medium 6 oz bottles. Seems high.
Dilution. I’m a bit stumped. If you have an average of a 1 meter tide (low) and a 10% beach slope (high) then each meter of shoreline is getting 2 x 10 cubic meters a day of water exchange, or 20,000 liters. If we dilute 300 grams by 20,000 liters we end up with a .015% solution, or a 1:66,000 dilution. Or about 16 parts per million. Lots of things are bad news at this dilution.
But is just looking at the tidal change this way valid. My gut feel is that currants sweep the coast with much greater volumes of water.
I’m not convinced:
The amount of sunscreen seems unreasonably high.
Ways to check:
1. Actually measure the amounts of oxy compounds in the water. This at least give you a handle on the dilution ratios.
2. With those numbers, test the effect on corals in captivity.