Central Equatorial Pacific Warming and Freshening in the Twentieth Century: Insights From a Coral Ensemble Approach
Central Equatorial Pacific Warming and Freshening in the Twentieth Century: Insights From a Coral Ensemble Approach
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DOI：
10.1029/2021gl094051
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发表时间：
2021-12
影响因子：
5.2
通讯作者：
N. Hitt;H. Sayani;A. Atwood;P. Grothe;C. Maupin;G. O’Connor;Rachel M. Walter;D. Gebregiorgis-
中科院分区：
文献类型：
--
作者：
N. Hitt;H. Sayani;A. Atwood;P. Grothe;C. Maupin;G. O’Connor;Rachel M. Walter;D. Gebregiorgis-
热带太平洋影响全球的气候模式，但很难从该地区稀疏的仪器观测中提取出对十年到百年尺度气候变化的严格限制。长寿珊瑚的氧同位素 (δ18O) 记录能够定量重建 20 世纪及以后的热带太平洋气候变化和趋势，但此类珊瑚极其罕见。在这里，我们使用多个短珊瑚 δ18O 记录来创建热带太平洋中部二十世纪气候的珊瑚“整体”重建。来自 Kiritimati 岛（北纬 2°，西经 157°）的 10 个 U/Th 化石珊瑚 δ18O 记录跨越了公元 1891 年至 2006 年，较年轻的样本能够与大量现代珊瑚记录和仪器海面温度进行定量比较。由现代和化石 Kiritimati 珊瑚 δ18O 记录构成的综合记录显示，从公元 1970 年起，气候条件向更温暖、更新鲜的方向转变，这与该地区之前发布的记录一致。
The tropical Pacific influences climate patterns across the globe, yet robust constraints on decadal to centennial‐scale climate variations are difficult to extract from sparse instrumental observations in this region. Oxygen isotope (δ18O) records from long‐lived corals enable the quantitative reconstruction of tropical Pacific climate variability and trends over the twentieth century and beyond, but such corals are exceedingly rare. Here, we use multiple short coral δ18O records to create a coral ‘ensemble’ reconstruction of twentieth century climate in the central tropical Pacific. Ten U/Th‐dated fossil coral δ18O records from Kiritimati Island (2°N, 157°W) span 1891 CE to 2006 CE, with the younger samples enabling quantitative comparison to a large ensemble of modern coral records and instrumental sea surface temperature. A composite record constructed of modern and fossil Kiritimati coral δ18O records shows a shift toward warmer and fresher conditions from 1970 CE onward, consistent with previously published records in this region.