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首页> 外文期刊>Geoscience and Remote Sensing Letters, IEEE >Role of a Cyclonic Eddy in the 7000-Year-Old Mentawai Coral Reef Death During the 1997 Indian Ocean Dipole Event
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Role of a Cyclonic Eddy in the 7000-Year-Old Mentawai Coral Reef Death During the 1997 Indian Ocean Dipole Event

机译:旋风涡在1997年印度洋偶极子事件中具有7000年历史的Mentawai珊瑚礁死亡中的作用

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A major discovery on the coral fronts was the death of the 7000-year-old coral reefs along the Mentawai Islands located offshore of southwest Sumatra, Indonesia, in the equatorial eastern Indian Ocean due to the Indian Ocean Dipole event of 1997. Using two ocean general circulation models, the NASA Ocean Biogeochemistry Model and Estimating the Circulation and Climate of the Ocean Model, we investigate the variability in nitrate influx, mixed layer depth (MLD), and surface currents over the region 0°-8° S; 90°-106° E. An enhanced nitrate influx by 6.5 micromoles (3150% higher than the mean), a lower MLD by 5 m (300% lower than the mean), and a massive cyclonic eddy (400 km meridonally and 500 km zonally) are observed over the region 4°-8° S; 94°-100° E (along the region of coral mortality) for three months (November and December 1997 and January 1998). Cyclonic eddies enhance phytoplankton and primary productivity, but when in the proximity of a coral reef, they can destroy the coral colony through asphyxiation caused by massive phytoplankton blooms. The results bring to the fore the importance of mesoscale processes that significantly impact the health of coral reefs.
机译:在珊瑚锋线上的一个重大发现是,由于1997年印度洋偶极子事件,位于印度尼西亚苏门答腊西南西南部,赤道东印度洋的明塔怀群岛沿岸的7000年历史的珊瑚礁死亡。常规循环模型,NASA海洋生物地球化学模型和海洋模型的环流和气候估算,我们调查了硝酸盐流入,混合层深度(MLD)和表面电流在0°C区,- 8°C×S; 90°-106°-E。硝酸盐流入量增加了6.5微摩尔(比平均值高3150%),而MLD降低了5 m(比平均值低300%),和一个巨大的旋风涡(子午线400公里,纬向500公里)被观测到在4°,8°,8°S区域。 94个月×100个月×E(沿珊瑚死亡区域),三个月(1997年11月,1997年12月和1998年1月)。旋风涡流可以提高浮游植物的生产力和初级生产力,但是在珊瑚礁附近,它们可以通过大量浮游植物大量繁殖引起的窒息破坏珊瑚群落。结果突显了中尺度过程的重要性,该过程显着影响珊瑚礁的健康。

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