Measuring CO2's impact at Molokai, Hawaii

A Submersible Habitat was placed in Molokai, Hawaii coral-reef, to measure, in situ, CO2's impact on rates of calcification and dissolution, by Researchers from the Center for Coastal Geology in St. Petersburg , Yates and Halley .

In March 2006 they published a paper in which they discovered that the average threshold value for carbon dioxide in seawater was 654 parts per million (ppm), while the present-day level of atmospheric CO2 is 380 ppm. Some scientists predict that atmospheric CO2 levels will reach 560 ppm by 2065 and 700 ppm by 2100; this increase may prove to be a major threat to marine habitats. Yates and Halley found that CO2 in seawater on the Molokai reef flat is already exceeding the 654-ppm threshold approximately 18 percent of the time.

Figure 1: Submersible Habitat in Molokai, Hawaii coral reef.