Linking large‐scale climate variability with Arctica islandica shell growth and geochemistry in northern Norway
Linking large‐scale climate variability with Arctica islandica shell growth and geochemistry in northern Norway
复制标题
DOI：
10.1002/lno.10252
复制
发表时间：
2016-03
影响因子：
4.5
通讯作者：
M. Mette;A. Wanamaker;M. Carroll;W. Ambrose;M. Retelle
中科院分区：
文献类型：
--
作者：
M. Mette;A. Wanamaker;M. Carroll;W. Ambrose;M. Retelle
由于缺乏来自海洋领域的高分辨率、地理上多样化的替代记录，限制了我们对近几个世纪以来北大西洋和北极气候动态的理解。本文研究了大尺度气候变率对挪威北部（71°N） arctic islandica （Linnaeus 1767）海洋双壳类动物的影响。通过建立一个连续的113年的主壳生长年表和一个来自活捕获壳材料的氧同位素记录（δ18O），我们评估了将年壳生长和地球化学记录作为北大西洋和北极气候百年尺度变化的代用指标。在近代大尺度北大西洋海面温度与贝壳生长和同位素代用指标之间观察到较强的负相关关系（r = - 0.54 ~ - 0.90; p < 0.05）。当使用复合壳生长/氧同位素多代理指数时，这种关系得到加强（r = - 0.72至- 0.90;p <0.01）。相关的区域空间格局与北大西洋洋流相似，北大西洋洋流在北纬55°附近分岔，表明大尺度海洋表面流动力学在调节挪威北部当地生态系统过程和贝壳生长方面发挥着重要作用。使用多元线性回归创建的联合代理指数显示，自公元1900年以来，大西洋多年代际涛动（AMO; r = - 0.622; p < 0.001）与大西洋多年代际涛动具有相对较强的时间稳定关系。基于贝壳的记录与北大西洋涛动之间关系的变异性与AMO指数的变化一致，表明挪威北部的大气强迫对水文变异性和生态系统动力学之间存在复杂的关系。
The lack of high resolution, geographically diverse proxy records from the marine realm limits our understanding of climate dynamics in the North Atlantic Ocean and Arctic during recent centuries. We investigate the impact of large‐scale climate variability on the marine bivalve, Arctica islandica, (Linnaeus 1767) from northern Norway (71°N). We evaluate the use of annual shell growth and geochemical records as proxies for North Atlantic and Arctic climate variability over centennial scales by developing a continuous, 113‐yr master shell growth chronology and an oxygen isotope record (δ18O) from live caught shell material. A relatively strong inverse relationship is observed between both the shell growth and isotopic proxies and large‐scale North Atlantic sea surface temperatures in modern times (r = −0.54 to −0.90; p < 0.05). This relationship is strengthened when using a combined shell growth/oxygen isotope Multiproxy Index (r = −0.72 to −0.90; p <0.01). The regional spatial pattern of correlation resembles that of the North Atlantic Current as it bifurcates around 55°N, indicating that large‐scale ocean surface current dynamics play an important role in regulating local ecosystem processes and thus shell growth in northern Norway. A combined proxy index created using multiple linear regression exhibits a relatively strong and time‐stable relationship with the Atlantic Multidecadal Oscillation (AMO; r = −0.622; p < 0.001) since AD 1900. Variability in the relationship between the shell based records and the North Atlantic Oscillation coincide with variations in the AMO index, suggesting a complex relationship between atmospheric forcing on hydrographic variability and ecosystem dynamics in northern Norway.