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丹麦海峡跨末次冰期旋回的中层水高分辨率底栖镁钙比温度记录

High-Resolution Benthic Mg/Ca Temperature Record of the Intermediate Water in the Denmark Strait Across D-O Stadial-Interstadial Cycles.

作者信息

Sessford E G, Tisserand A A, Risebrobakken B, Andersson C, Dokken T, Jansen E

机构信息

Department of Earth Science, Bjerknes Centre for Climate Research University of Bergen Bergen Norway.

NORCE Norwegian Research Centre AS Bjerknes Centre for Climate Research Bergen Norway.

出版信息

Paleoceanogr Paleoclimatol. 2018 Nov;33(11):1169-1185. doi: 10.1029/2018PA003370. Epub 2018 Nov 5.

DOI:10.1029/2018PA003370
PMID:31008447
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6472531/
Abstract

Dansgaard-Oeschger (D-O) climate instabilities that took place during Marine Isotope Stage 3 are connected to changes in ocean circulation patterns and sea ice cover. Here we explore in detail the configuration of the water column of the Denmark Strait during D-O events 8-5. How the ocean currents and water masses within the Denmark Strait region responded and were connected to the North Atlantic are discussed. We investigate sediment core GS15-198-36CC, from the northern side of the Greenland-Iceland Ridge, at 30-year temporal resolution. Stable carbon and oxygen isotope reconstructions based on benthic foraminifera, together with a high-resolution benthic foraminiferal record of Mg/Ca paleothermometry, is presented. The site was bathed by warm intermediate waters during stadials and cool but gradually warming intermediate water during interstadials. We suggest that stadial conditions in the Denmark Strait are characterized by a well-stratified water column with a warm intermediate water mass that lies beneath a cold fresh body of water where sea ice and brine rejection work in consort to uphold the halocline conditions. Interstadial periods are not a pure replicate of modern times, but rather have two modes of operation, one similar to today, and the other incorporating a brief period of warm intermediate water and increased ventilation.

摘要

末次冰期第3阶段发生的丹斯加德-厄施格尔（Dansgaard-Oeschger，D-O）气候不稳定与海洋环流模式和海冰覆盖的变化有关。在此，我们详细探讨了D-O事件8至5期间丹麦海峡水柱的结构。讨论了丹麦海峡区域内的洋流和水体是如何响应并与北大西洋相连的。我们研究了来自格陵兰-冰岛海脊北侧的沉积物岩芯GS15-198-36CC，时间分辨率为30年。展示了基于底栖有孔虫的稳定碳和氧同位素重建结果，以及Mg/Ca古温度测定的高分辨率底栖有孔虫记录。该地点在stadials期间被温暖的中层水覆盖，在interstadials期间被凉爽但逐渐变暖的中层水覆盖。我们认为，丹麦海峡的stadial条件的特征是水柱分层良好，有一个温暖的中层水体位于寒冷淡水水体之下，海冰和盐水排放共同维持盐跃层条件。Interstadial时期并非现代的纯粹复制品，而是有两种运行模式，一种类似于今天，另一种包括一段短暂的温暖中层水和增强的通风期。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ece0/6472531/730791ae5730/PALO-33-1169-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ece0/6472531/2c2c648898b4/PALO-33-1169-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ece0/6472531/83d8c282f5f4/PALO-33-1169-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ece0/6472531/567ab77ca224/PALO-33-1169-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ece0/6472531/26470077ca52/PALO-33-1169-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ece0/6472531/82b50ac23133/PALO-33-1169-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ece0/6472531/0f1d20234145/PALO-33-1169-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ece0/6472531/730791ae5730/PALO-33-1169-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ece0/6472531/2c2c648898b4/PALO-33-1169-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ece0/6472531/83d8c282f5f4/PALO-33-1169-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ece0/6472531/567ab77ca224/PALO-33-1169-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ece0/6472531/26470077ca52/PALO-33-1169-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ece0/6472531/82b50ac23133/PALO-33-1169-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ece0/6472531/0f1d20234145/PALO-33-1169-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ece0/6472531/730791ae5730/PALO-33-1169-g007.jpg

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本文引用的文献

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North Atlantic warming during Dansgaard-Oeschger events synchronous with Antarctic warming and out-of-phase with Greenland climate.Dansgaard-Oeschger事件期间北大西洋变暖与南极变暖同步，与格陵兰岛气候不同步。
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