Early signs of bleaching
This Sept. 13, 2019 photo shows a chunk of bleached, dead coral shown on a wall near a bay on the west coast of the Big Island near Captain Cook, Hawaii.
Researchers using high-tech equipment to monitor Hawaii's reefs are seeing early signs of bleaching in Papa Bay and elsewhere caused by a marine heat wave that has sent temperatures soaring to record highs for months. June, July and parts of August all experienced the hottest ocean temperatures ever recorded around the Hawaiian Islands. So far in September, oceanic temperatures are below only those seen in 2015.
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