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Australia’s Great Barrier Reef hit by ’worst’ bleaching

澳大利亞大堡礁“嚴(yán)重”白化

The National Coral Bleaching Taskforce says 95% of reefs from Cairns to Papua New Guinea are now severely bleached.

國家珊瑚白化工作組指出：從凱恩斯到巴布亞新幾內(nèi)亞沿岸，95%的珊瑚礁發(fā)生了嚴(yán)重的白化現(xiàn)象。

It says only four reefs out of 520 have no evidence of bleaching.

據(jù)說在全部520座珊瑚礁中，只有4座沒有發(fā)生白化。

Unesco voted not to put the reef on its World Heritage in Danger list last year, but green groups want the decision reassessed.

去年聯(lián)合國教科文組織投票決議不把大堡礁列入世界瀕危遺產(chǎn)名錄，但是一些綠色組織希望重新評估這個決定。

Coral taskforce convener Professor Terry Hughes told the BBC his team was yet to find the southern border where the bleaching ended.

珊瑚白化工作組的發(fā)起人Terry Hughes教授告訴BBC：他的團(tuán)隊還沒有找到白化現(xiàn)象在南部延伸的邊界。

"Tomorrow we will continue further south from Cairns to Townsville about 400km (250 miles) and spend the day scoring another 150 reefs," Professor Hughes said.

Hughes教授說：“明天我們會從凱恩斯往南到湯斯維爾再走400公里(250英里)，再檢查150座珊瑚礁”

Mass coral bleaching

大片珊瑚白化

Coral bleaching is caused by rising water temperatures resulting from two natural warm currents

珊瑚的白化現(xiàn)象是由兩個自然暖流引起的海水升溫導(dǎo)致的。

It is exacerbated by man-made climate change, as the oceans are absorbing about 93% of the increase in the earth’s heat

人類活動導(dǎo)致了氣候的變化，進(jìn)而引起了海水溫度的上升，因為海洋吸收了全球熱量增加值的93%。

Bleaching happens when corals under stress drive out the algae known as zooxanthellae that give them colour

“蟲黃藻”能夠給珊瑚染色，而在高溫壓力下珊瑚會排出這種藻類，從而發(fā)生白化現(xiàn)象。

If normal conditions return, the corals can recover, but it can take decades, and if the stress continues the corals can die

如果氣候恢復(fù)正常的話，珊瑚能夠變回原來的顏色，但這往往需要幾十年的時間。而如果高水溫的情況持續(xù)下去的話，珊瑚就會死亡。

The current worldwide bleaching episode is predicted to be the worst on record

據(jù)預(yù)測，現(xiàn)在全世界范圍內(nèi)的珊瑚白化現(xiàn)象是有記錄以來最嚴(yán)重的。

Experts say it is too early to tell whether the corals will recover, but scientists "in the water" are already reporting up to 50% mortality of bleached corals.

有學(xué)者表明現(xiàn)在斷言珊瑚能不能恢復(fù)還為時尚早，但是經(jīng)過實地考察的科學(xué)家們的報告指出白化珊瑚有超過50%的死亡率。

Climate change and the effects of El Nino are being blamed for the rise in sea temperatures that causes coral bleaching.

全球變暖和厄爾尼諾被認(rèn)為是導(dǎo)致海水升溫和珊瑚白化的罪魁禍?zhǔn)住?/font>