Coralline algal growth-increment widths archive North Atlantic climate variability
Coralline algal growth-increment widths archive North Atlantic climate variability
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DOI：
10.1016/j.palaeo.2010.04.009
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发表时间：
2011-03-01
影响因子：
3
通讯作者：
Jacob, D. E.
中科院分区：
文献类型：
--
作者：
Halfar, J.;Hetzinger, S.;Jacob, D. E.
在过去的十年里，珊瑚藻越来越多地被用作古气候信息的档案。结壳珊瑚藻，其中存款每年的增长增量在高镁方解石骨架，是其中最长寿的浅海生物。事实上，根据放射性测年法，一种活的植物最近被证明至少活了850年。虽然一些调查已经成功地利用珊瑚藻骨架的地球化学信息来重建海面温度，很少有人注意到采用生长增量宽度作为温度代理。在这里，我们探讨了生长和环境参数之间的关系，在Clathromorphum compactum收集在亚北极西北大西洋。结果表明，个别植物的生长增量宽度与仪器海表温度（SST）的相关性很差。然而，一个区域网络的多个生长增量宽度时间序列的平均记录的C。从1950年以来，相距800公里的致密样品与年度仪器SST有很强的相关性。因此，类似于树木年代学中应用的方法，对珊瑚藻类的多个年代学记录进行平均可以提供准确的气候信息。根据现代收集的和博物馆标本创建的115年生长增量宽度主年表与北大西洋海面温度的数十年变化高度相关。藻类生长异常的积极变化记录了20世纪90年代大西洋西北部有据可查的制度转变和变暖。在1920年代和1930年代也出现了藻类生长异常的大的积极变化，表明整个北大西洋同时发生的大规模政权转变的影响在亚北极西北大西洋比以前认为的更强烈，甚至可能超过1990年代事件的变暖幅度。(C)2010 Elsevier B.V.保留所有权利。
Over the past decade coralline algae have increasingly been used as archives of paleoclimate information. Encrusting coralline algae, which deposit annual growth increments in a high Mg-calcite skeleton, are amongst the longest-lived shallow marine organisms. In fact, a live-collected plant has recently been shown to have lived for at least 850 years based on radiometric dating. While a number of investigations have successfully used geochemical information of coralline algal skeletons to reconstruct sea surface temperatures, less attention has been paid to employ growth increment widths as a temperature proxy. Here we explore the relationship between growth and environmental parameters in Clathromorphum compactum collected in the subarctic Northwestern Atlantic. Results indicate that growth-increment widths of individual plants are poorly correlated with instrumental sea surface temperatures (SST). However, an averaged record of multiple growth increment-width time series from a regional network of C. compactum specimens up to 800 km apart reveals strong correlations with annual instrumental SST since 1950. Hence, similar to methods applied in dendrochronology, averaging of multiple sclerochronological records of coralline algae provides accurate climate information. A 115-year growth-increment width master chronology created from modern-collected and museum specimens is highly correlated to multidecadal variability seen in North Atlantic sea surface temperatures. Positive changes in algal growth anomalies record the well-documented regime shift and warming in the northwestern Atlantic during the 1990s. Large positive changes in algal growth anomalies were also present in the 1920s and 1930s, indicating that the impact of a concurrent large-scale regime shift throughout the North Atlantic was more strongly felt in the subarctic Northwestern Atlantic than previously thought, and may have even exceeded the 1990s event with respect to the magnitude of the warming. (C) 2010 Elsevier B.V. All rights reserved.