High‐resolution Sr/Ca ratios in a Porites lutea coral from Lakshadweep Archipelago, southeast Arabian Sea: An example from a region experiencing steady rise in the reef temperature

High‐resolution Sr/Ca ratios in a Porites lutea coral from Lakshadweep Archipelago, southeast Arabian Sea: An example from a region experiencing steady rise in the reef temperature
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阿拉伯海东南部拉克沙威群岛黄滨珊瑚的高分辨率 Sr/Ca 比率:来自珊瑚礁温度稳步上升的地区的示例

DOI:
10.1002/2015jc010821
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发表时间:
2016
影响因子:
--
通讯作者:
Garbe-Schönberg
Garbe-Schönberg
中科院分区:
--
文献类型:
--
作者:
Hetzinger;Pfeiffer;W.-Chr;Garbe-Schönberg

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在这里,我们提出了第一个记录的Sr/Ca的变化,在一个adnivePorites luteacoral从拉克沙威群岛,阿拉伯海。近年来,该区域及周边地区的年平均海表温度(SST)稳步上升。在一些主要的厄尔尼诺事件期间,SST甚至更高,对珊瑚施加额外的热应力,偶尔导致珊瑚漂白。我们从珊瑚-Sr/Ca记录(1981-2008)中推断,在其中一些事件中,高和持续的SST导致珊瑚-Sr/Ca中的温度信号减弱,削弱了珊瑚记录全面变暖的能力。因此,珊瑚Sr/Ca可能提供了过去厄尔尼诺南方涛动(ENSO)引起的热应力事件的历史,这是珊瑚Sr/Ca和Nino3.4指数之间的交叉谱分析中也看到的一个经常性特征。尽管在重大厄尔尼诺事件期间会受到间歇性热应力的影响,但我们的珊瑚代理忠实地记录了季节性季风引起的夏季降温,大约为-2.3 °C。用仪器网格SST数据校准珊瑚Sr/Ca与区域SST和季风变率有显着相关性。因此,这一地区的季风气候是重建SST长期变化的非常有价值的档案,在季节尺度上受到季风变化的强烈影响。更重要的是,我们的数据表明,这个SST不断增加的地点是测试预计人为SST增加对全球已经处于热应力下的珊瑚礁的未来影响的理想地点。
Here we present the first record of Sr/Ca variability in a massivePorites luteacoral from the Lakshadweep Archipelago, Arabian Sea. The annual mean sea surface temperature (SST) in this region and the surrounding areas has increased steadily in the recent past. During some major El Niño events, SSTs are even higher, imposing additional thermal‐stress on corals, episodically leading to coral bleaching. We infer from the coral‐Sr/Ca record (1981–2008) that during some of these events high and persistent SSTs lead to a dampening of the temperature signal in coral‐Sr/Ca, impairing the coral's ability to record full scale warming. Thus, coral‐Sr/Ca may provide a history of past El Niño Southern‐Oscillation (ENSO) induced thermal‐stress episodes, which are a recurrent feature also seen in cross‐spectral analysis between coral‐Sr/Ca and the Nino3.4 index. Despite the impact of episodical thermal‐stress during major El Niño events, our coral proxy faithfully records the seasonal monsoon‐induced summer cooling on the order of ∼2.3°C. Calibration of coral‐Sr/Ca with instrumental grid‐SST data shows significant correlation to regional SST and monsoon variability. Hence, massivePoritescorals of this region are highly valuable archives for reconstructing long‐term changes in SST, strongly influenced by monsoon variability on seasonal scales. More importantly, our data show that this site with increasing SST is an ideal location for testing the future effects of the projected anthropogenic SST increase on coral reefs that are already under thermal‐stress worldwide.
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发表时间: 2011-07-01
影响因子: 3
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