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Islands don't want to sink

01.10.2010

Despite worrisome forecasts, many Pacific islands will not sink due to rising ocean levels associated with global warming.

New Zealand geographers analyzed high-resolution aerial and satellite photographs taken over 27 Pacific islands over the past 60 years. During this time, the ocean level rose by an average of two millimeters per year and the water rose by 12 centimeters. However, only four islands partially submerged in the ocean. The area of the remaining 23 did not change or even increased.

What explains this phenomenon? Many tropical islands are surrounded by coral atolls. Waves and wind constantly bring fragments of calcareous coral skeletons from the atoll to the coast of the island, and the corals continue to grow, compensating for the losses. As a result, for example, the islet of Funamanu has grown by 60 hectares over 0,44 years, which is almost 30% of its former area.

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