Planktic and Benthic 14C Reservoir Ages for Three Ocean Basins, Calibrated by a Suite of 14C Plateaus in the Glacial-to-Deglacial Suigetsu Atmospheric 14C Record
Planktic and Benthic 14C Reservoir Ages for Three Ocean Basins, Calibrated by a Suite of 14C Plateaus in the Glacial-to-Deglacial Suigetsu Atmospheric 14C Record
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DOI：
10.2458/azu_rc.57.17916
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发表时间：
2015-01
期刊：
影响因子：
8.3
通讯作者：
M. Sarnthein;S. Balmer;P. Grootes;M. Mudelsee
中科院分区：
文献类型：
--
作者：
M. Sarnthein;S. Balmer;P. Grootes;M. Mudelsee
本文介绍了一个汇编的南极和底栖14 C水库年龄的末次冰期最大期（LGM）和早期冰消期从11个关键地点的全球海洋环流在大西洋和印度-太平洋。这些年龄是通过14 C平台调谐获得的，这是一种可靠的技术，通过比较沉积物记录的南极14 C平台组与大气14 C记录的南极14 C平台组，可以获得海洋沉积物记录的绝对年代学和表层和深层沃茨变化的水库/通风年龄（Δ 14 C值）的高分辨率记录。到目前为止，发表的结果已被用作大气14 C参考U/Th-定年珊瑚，Cariaco南极记录，和洞穴。现在，我们已经使用纹管计数的大气14 C记录的水月湖陆地宏体化石重新校准的边界年龄和水库的年龄的7个公开的记录直接到大气14 C记录。此外，还给出了四个新岩心的结果和四个已发表记录的进一步分析结果。主要结论如下：（1）水月大气14 C记录在其纹孔计数时间尺度上反映了所有的14 C高原、其内部结构和相对长度，但意味着在末次盛冰期和早期冰消期，平均14 C高原年龄增加了200-700 14 C年。(2)根据同期大气和南极14 C高原的不同14 C年龄，低纬度泻湖沃茨的海洋表层水Δ 14 C可能暂时下降到相当于1400年，但在分层的副极地沃茨和上升流沃茨（如南海）中，海洋表层水Δ 14 C可能达到2500年以上。这些值与广泛假设的400年不变的全球南极洲Δ 14 C值有很大差异。(3)冰消期Δ 14 C值组在邻近岩芯测得的14 C记录中具有很好的重现性。(4)在末次盛冰期和冰消期洋盆中，从古地磁Δ 14 C和同时期底栖-古地磁Δ 14 C差值之和推导出的表观深水14 C通风年龄（相当于底栖Δ 14 C）从500年到>5000年不等。
This article presents a compilation of planktic and benthic 14C reservoir ages for the Last Glacial Maximum (LGM) and early deglacial from 11 key sites of global ocean circulation in the Atlantic and Indo-Pacific Ocean. The ages were obtained by 14C plateau tuning, a robust technique to derive both an absolute chronology for marine sediment records and a high-resolution record of changing reservoir/ventilation ages (Δ14C values) for surface and deep waters by comparing the suite of planktic 14C plateaus of a sediment record with that of the atmospheric 14C record. Results published thus far have used as atmospheric 14C reference U/Th-dated corals, the Cariaco planktic record, and speleothems. We have now used the varve-counted atmospheric 14C record of Lake Suigetsu terrestrial macrofossils to recalibrate the boundary ages and reservoir ages of the seven published records directly to an atmospheric 14C record. In addition, the results for four new cores and further planktic results for four published records are given. Main conclusions from the new compilation are the following: (1) The Suigetsu atmospheric 14C record on its varve-counted timescale reflects all 14C plateaus, their internal structures, and relative length previously identified, but implies a rise in the average 14C plateau age by 200–700 14C yr during the LGM and early deglacial times. (2) Based on different 14C ages of coeval atmospheric and planktic 14C plateaus, marine surface water Δ14C may have temporarily dropped to an equivalent of ∼0 yr in low-latitude lagoon waters, but reached >2500 14C yr both in stratified subpolar waters and in upwelled waters such as in the South China Sea. These values differ significantly from a widely assumed constant global planktic Δ14C value of 400 yr. (3) Suites of deglacial planktic Δ14C values are closely reproducible in 14C records measured at neighboring core sites. (4) Apparent deep-water 14C ventilation ages (equivalents of benthic Δ14C), deduced from the sum of planktic Δ14C and coeval benthic-planktic 14C differences, vary from 500 up to >5000 yr in LGM and deglacial ocean basins.