Science:太平洋珊瑚礁崩溃达数千年之久
巴拿马沿海的一个有6000年之久的珊瑚礁记录揭示,在该热带东太平洋中的珊瑚礁生态系统的崩溃已经有约2600年了。
Lauren Toth及其同事说,该系统崩溃是在约4000年前开始的,它可能是由厄尔尼诺 - 南方震荡(ENSO)的力量和频率的增加所驱动的。研究人员说,如果气候变暖产生了一种更强且更频繁的ENSO模式,当代的太平洋珊瑚礁系统可能会经历某种类似的大面积破坏。该古老的珊瑚礁停止吸积更多的物质已经有约2600年或者说占了其历史的40%的时间了。这一停止与ENSO强度和频率的增加是一致的,它会产生较暖且较黑暗的海洋从而抑制珊瑚的生产。
该珊瑚礁确实最终出现了反弹,表明现代的珊瑚礁生态系统在面对现代气候变化时可能有某种恢复能力。
了解更多:
ENSO Drove 2500-Year Collapse of Eastern Pacific Coral Reefs
DOI:10.1126/science.1221168
Cores of coral reef frameworks along an upwelling gradient in Panamá show that reef ecosystems in the tropical eastern Pacific collapsed for 2500 years, representing as much as 40% of their history, beginning about 4000 years ago. The principal cause of this millennial-scale hiatus in reef growth was increased variability of the El Niño–Southern Oscillation (ENSO) and its coupling with the Intertropical Convergence Zone. The hiatus was a Pacific-wide phenomenon with an underlying climatology similar to probable scenarios for the next century. Global climate change is probably driving eastern Pacific reefs toward another regional collapse.
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