Coral Bleaching Spreading Fast In Most Pristine Core Areas Of Great Barrier Reef - Guardian

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Damage to parts of the Great Barrier Reef has worsened, leading authorities to raise the alert to the second-highest level, indicating severe local coral bleaching. The bleaching is worst in the most pristine and remote parts of the reef north of Cairns, according to Terry Hughes, convenor of the National Coral Taskforce. “It’s the jewel in the crown of the Great Barrier Reef and it’s now getting a quite a serious impact from this bleaching event,” he said. “The northern reefs are bleaching quite badly now.” Hughes said it appeared there was some coral death occurring in northern reefs.

Russell Reichelt, the chairman of the Great Barrier Reef Marine Park Authority said the area around Lizard Island, 250km north of Cairns, and sites further north, had fared the worst. The US National Oceanographic and Atmospheric Administration predicts bleaching conditions to worsen over the coming weeks. The world is currently in the grips of the third global coral bleaching event. Coral bleaches when water temperatures are raised above a certain threshold for an extended period of time.

Hughes, director of the ARC centre of excellence for coral reef studies at James Cook University, said although the strong El Niño occurring now is partly to blame for the bleaching event, the real culprit is global warming caused by carbon emissions. “These massive thousand-kilometer bleaching events didn’t happen thirty years ago,” he said. “No-one ever recorded a mass bleaching event in the 40s, 50s, 60s, 70s, until the middle of the 1980s … and the Great Barrier Reef didn’t bleach until 1998 for the first time.”

“The baseline temperature on the barrier reef has gone up between a half a degree and a full degree depending where you are on the great barrier reef. Bleaching happens once coral sits in water a degree or two above the normal summer maximum for a month or so.”

EDIT

http://www.theguardian.com/environment/2016/mar/14/severe-coral-bleaching-worsens-in-most-pristine-parts-of-great-barrier-reef

[2naSalit]

1. K&R for visibility.