Sea-surface temperature and sea ice distribution of the Southern Ocean at the EPILOG Last Glacial Maximum - A circum-Antarctic view based on siliceous microfossil records
Sea-surface temperature and sea ice distribution of the Southern Ocean at the EPILOG Last Glacial Maximum - A circum-Antarctic view based on siliceous microfossil records
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DOI：
10.1016/j.quascirev.2004.07.015
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发表时间：
2005-04-01
影响因子：
4
通讯作者：
Armand, L
中科院分区：
文献类型：
--
作者：
Gersonde, R;Crosta, X;Armand, L
在硅藻和放射虫定量研究的基础上，利用南大洋大西洋、印度洋和太平洋区122个沉积物柱样，估算了夏季海表温度和海冰分布，重建了晚冰期（19.5-16.0ka或23000-19000 calyr）的末次冰期环境。B.P.）时间片应用的统计方法包括Imbrie和Kipp方法，现代模拟技术和通用加性模型。夏季SST揭示了更大的地表水冷却比重建CLIMAP（地质学会美国。地图Ser. MC-36（1981）1），在大西洋和印度部分的亚南极带达到最高值（4-5摄氏度）。最大冬季海冰（WSI）范围的重建是根据CLIMAP，显示WSI字段的扩展约100%，与现在相比。虽然只有有限的信息，数据清楚地表明，CLIMAP大大高估了冰川夏季海冰的范围。由于南极寒冷沃茨向北扩展了5-10度的纬度和相对较小的副热带锋位移，在末次冰期期间，南大洋北方区的温度梯度变陡。然而，这种重建可能不适合太平洋地区。现有的几个数据表明，减少冷却在南太平洋，并给出建议的冰川南Ocean.This study的非均匀冷却的一部分，MARGO，一个多代理方法的冰川海洋表面的重建。(c)2004爱思唯尔有限公司保留所有权利。
Based on the quantitative study of diatoms and radiolarians, summer sea-surface temperature (SSST) and sea ice distribution were estimated from 122 sediment core localities in the Atlantic, Indian and Pacific sectors of the Southern Ocean to reconstruct the last glacial environment at the EPILOG (19.5-16.0ka or 23000-19000 cal yr. B.P.) time-slice. The statistical methods applied include the Imbrie and Kipp Method, the Modern Analog Technique and the General Additive Model. Summer SSTs reveal greater surface-water cooling than reconstructed by CLIMAP (Geol. Soc. Am. Map Chart. Ser. MC-36 (1981) 1), reaching a maximum (4-5 degrees C) in the present Subantarctic Zone of the Atlantic and Indian sector. The reconstruction of maximum winter sea ice (WSI) extent is in accordance with CLIMAP, showing an expansion of the WSI field by around 100% compared to the present. Although only limited information is available, the data clearly show that CLIMAP strongly overestimated the glacial summer sea ice extent. As a result of the northward expansion of Antarctic cold waters by 5-10 degrees in latitude and a relatively small displacement of the Subtropical Front, thermal gradients were steepened during the last glacial in the northern zone of the Southern Ocean. Such reconstruction may, however, be inapposite for the Pacific sector. The few data available indicate reduced cooling in the southern Pacific and give suggestion for a non-uniform cooling of the glacial Southern Ocean.This study is part of MARGO, a multiproxy approach for the reconstruction of the glacial ocean surface. (c) 2004 Elsevier Ltd. All rights reserved.