Coralline red algae as high-resolution climate recorders
Coralline red algae as high-resolution climate recorders
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DOI：
10.1130/g24635a.1
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发表时间：
2008-06-01
期刊：
影响因子：
5.8
通讯作者：
Wanamaker, A. D., Jr.
中科院分区：
文献类型：
--
作者：
Halfar, J.;Steneck, R. S.;Wanamaker, A. D., Jr.
大多数高分辨率、基于代理的古气候研究集中在热带海洋，而中高纬度海洋区域受到的关注较少，尽管它们在全球气候系统中很重要。目前，双壳类软体动物的年代学分析提供了大部分年至亚年分辨率的温带海洋气候数据，尽管随着壳龄的增加，生长速度会减慢，这使得解释变得复杂。因此，为了满足对来自温带地区的额外高分辨率代理气候数据的需求，我们在美国缅因湾对珊瑚红藻Clathromorphum compactum进行了为期一年的现场校准。珊瑚红藻广泛分布于全球沿海地区，单株钙化植物可在温带和亚北极海洋中连续生存几个世纪。从C. compactum监测标本的生长增量中提取的亚年分辨率稳定氧同位素与5月至12月钙化期现场测量的海面温度具有良好的相关性，突出了珊瑚红藻作为温带气候档案的适用性。此外，C. compactum的30年三角洲O-18记录与仪器海表温度记录（r = -0.58,p = 0.0008）和来自缅因湾中部收集的北极双壳类岛屿的代理重建（r = 0.54, p = 0.002）之间存在很强的相关性。
Most high-resolution, proxy-based paleoclimate research has concentrated on tropical oceans, while mid- and high-latitude marine regions have received less attention, despite their importance in the global climate system. At present, sclerochronological analyses of bivalve mollusks supply the bulk of annual- to subannual-resolution extratropical marine climate data, even though interpretation is complicated by a slowdown of growth with increasing shell age. Hence, in order to address the need for additional high-resolution proxy climate data from extratropical regions, we conducted the first year-long in situ field calibration of the coralline red alga Clathromorphum compactum in the Gulf of Maine, United States. Coralline red algae are widely distributed in coastal regions worldwide, and individual calcified plants can live continuously for several centuries in temperate and subarctic oceans. Stable oxygen isotopes extracted at subannual resolution from growth increments of monitored specimens of C. compactum relate well to in situ-measured sea-surface temperatures during the May to December calcification period, highlighting the suitability of coralline red algae as an extratropical climate archive. Furthermore, there is a strong correlation between a 30 yr delta O-18 record of C. compactum and an instrumental sea-surface temperature record (r = -0.58,p = 0.0008) and a proxy reconstruction derived from the bivalve Arctica islandica collected in the central Gulf of Maine (r = 0.54, p = 0.002).