Paleoseawater density reconstruction and its implication for cold-water coral carbonate mounds in the northeast Atlantic through time
Paleoseawater density reconstruction and its implication for cold-water coral carbonate mounds in the northeast Atlantic through time
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古海水密度重建及其对东北大西洋冷水珊瑚碳酸盐丘随时间变化的影响
DOI：
10.1002/2015pa002859
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Liebetrau
中科院分区：
文献类型：
--
作者：
Rüggeberg;Flogel;W.-Chr;Raddatz;Liebetrau
碳酸盐堆积物和土丘在整个地球历史上都是令人印象深刻的生物成因结构。在最近的东北大西洋，冷水珊瑚礁形成了海拔高达300 米的巨大碳酸盐丘。这些珊瑚碳酸盐土丘的扩张速度受到过去2.7MYR 期间气候变化的影响。对其开发的环境控制与对其主要建造者--造礁CWCS的控制直接相关。海水密度已被认为是东北大西洋CWC生长的主要控制参数之一。一种可能性是在碳酸盐丘上方形成一个跃层，这增加了水动力状况，支持了增加的食物供应，并可能促进了珊瑚幼虫的分布。根据底栖有孔虫的稳定氧同位素恢复过去海水密度的可能性得到了进一步发展：一个区域方程给出了三种不同背景的可靠结果，即间冰峰(例如全新世)、冰峰(例如最后一次冰盛期)和中等冰期(介于两个极端之间)。对两个不同的东北大西洋碳酸盐岩丘陵的海水密度进行了重建，表明碳酸盐丘的发育主要发生在海水密度为27.3~27.7 kg m−3(σΘ记法)的范围内。与最近的情况相比，我们将重建的密度范围解释为作为边界层的跃层，洋流在其上发展，携带营养物质，可能还携带珊瑚幼虫。CWC珊瑚礁的生长与更新世重建的海水密度密切相关，突显了跃层和中间水团动力学的重要性。
Carbonate buildups and mounds are impressive biogenic structures throughout Earth history. In the recent NE Atlantic, cold‐water coral (CWC) reefs form giant carbonate mounds of up to 300 m of elevation. The expansion of these coral carbonate mounds is paced by climatic changes during the past 2.7 Myr. Environmental control on their development is directly linked to controls on its main constructors, the reef‐building CWCs. Seawater density has been identified as one of the main controlling parameter of CWC growth in the NE Atlantic. One possibility is the formation of a pycnocline above the carbonate mounds, which is increasing the hydrodynamic regime, supporting elevated food supply, and possibly facilitating the distribution of coral larvae. The potential to reconstruct past seawater densities from stable oxygen isotopes of benthic foraminifera has been further developed: a regional equation gives reliable results for three different settings,peak interglacials(e.g., Holocene),peak glacials(e.g., Last Glacial Maximum), andintermediatesetting (between the two extremes). Seawater densities are reconstructed for two different NE Atlantic CWC carbonate mounds in the Porcupine Seabight indicating that the development of carbonate mounds is predominantly found at a seawater density range between 27.3 and 27.7 kg m−3(σΘnotation). Comparable to recent conditions, we interpret the reconstructed density range as a pycnocline serving as boundary layer, on which currents develop, carrying nutrition and possibly coral larvae. The close correlation of CWC reef growth with reconstructed seawater densities through the Pleistocene highlights the importance of pycnoclines and intermediate water mass dynamics.
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DOI：
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发表时间：
2014
期刊：
影响因子：
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作者：
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DOI：
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发表时间：
2005
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作者：
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影响因子：
64.8
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Belgica 97 Shipboard Party