Coral Record of Younger Dryas Chronozone Warmth on the Great Barrier Reef
Coral Record of Younger Dryas Chronozone Warmth on the Great Barrier Reef
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DOI：
10.1029/2020pa003962
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发表时间：
2020-12
影响因子：
3.5
通讯作者：
Logan D. Brenner;B. Linsley;J. Webster;D. Potts;T. Felis;M. Gagan;M. Inoue;H. McGregor;A. Suzuki;A. Tudhope;T. Esat;Alex L. Thomas;W. Thompson;S. Fallon;M. Humblet;M. Tiwari;Y. Yokoyama
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文献类型：
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作者：
Logan D. Brenner;B. Linsley;J. Webster;D. Potts;T. Felis;M. Gagan;M. Inoue;H. McGregor;A. Suzuki;A. Tudhope;T. Esat;Alex L. Thomas;W. Thompson;S. Fallon;M. Humblet;M. Tiwari;Y. Yokoyama
大堡礁（GBR）是一个国际公认的和广泛研究的生态系统，但很少有人知道它的海表温度（SST）的演变，因为末次冰盛期（LGM）（约20 kyr BP）。在这里，我们提出了Isopora珊瑚衍生SST校准的第一个古应用程序，以一套25个先前发表的Isopora化石，来自GBR中部，跨度约25-11 kyr BP。由此产生的多冠Sr/Ca-和δ 18 O-派生的SST异常（SSTA）的历史被放置在出版的相对海平面，礁序列，珊瑚礁组合演化的背景下。我们的新计算表明，LGM期间，Noggin Pass（~17°S）的SST平均较低约5-5.5°C，Hydrographer's Passage（~20°S）的SST平均较低约7-8°C（Sr/Ca衍生），与先前的估计一致（Felis等人，2014，https：//doi.org/10.1038/ncomms5102）。我们专注于新仙女木年代（YDC，~12.9-11.7 kyr BP），其南半球的表达，特别是在澳大利亚，是难以捉摸的和不受约束的背景。我们的记录并没有表明在YDC期间的冷却，在GBR上的这段时间内达到了近现代的温度，支持了这一气候事件的不对称半球呈现。基于先前的研究（Felis等人，2014年，https：//doi.org10.1038/ncomms5102），这些来自GBR的Isopora SSTA化石数据提供了对冰消期珊瑚礁响应的新见解，自LGM以来，YDC期间的近现代变暖。
The Great Barrier Reef (GBR) is an internationally recognized and widely studied ecosystem, yet little is known about its sea surface temperature (SST) evolution since the Last Glacial Maximum (LGM) (~20 kyr BP). Here, we present the first paleo‐application of Isopora coral‐derived SST calibrations to a suite of 25 previously published fossil Isopora from the central GBR spanning ~25–11 kyr BP. The resultant multicoral Sr/Ca‐ and δ18O‐derived SST anomaly (SSTA) histories are placed within the context of published relative sea level, reef sequence, and coralgal reef assemblage evolution. Our new calculations indicate SSTs were cooler on average by ~5–5.5°C at Noggin Pass (~17°S) and ~7–8°C at Hydrographer's Passage (~20°S) (Sr/Ca‐derived) during the LGM, in line with previous estimates (Felis et al., 2014, https://doi.org/10.1038/ncomms5102). We focus on contextualizing the Younger Dryas Chronozone (YDC, ~12.9–11.7 kyr BP), whose Southern Hemisphere expression, in particular in Australia, is elusive and poorly constrained. Our record does not indicate cooling during the YDC with near‐modern temperatures reached during this interval on the GBR, supporting an asymmetric hemispheric presentation of this climate event. Building on a previous study (Felis et al., 2014, https://doi.org10.1038/ncomms5102), these fossil Isopora SSTA data from the GBR provide new insights into the deglacial reef response, with near‐modern warming during the YDC, since the LGM.