Enhanced δ        <sup >1313        C and δ        <sup >1818        O Differences Between the South Atlantic and South Pacific During the Last Glaciation: The Deep Gateway Hypothesis

Sikes Elisabeth L.; Allen Katherine A.; Lund David C.

摘要

Abstract > Enhanced vertical gradients in benthic foraminiferal δ 13 C and δ 18 O in the Atlantic and Pacific during the last glaciation have revealed that ocean overturning circulation was characterized by shoaling of North Atlantic sourced interior waters; nonetheless, our understanding of the specific mechanisms driving these glacial isotope patterns remains incomplete. Here we compare high‐resolution depth transects of <fi>Cibicidoides</fi> spp. δ 13 C and δ 18 O from the Southwest Pacific and the Southwest Atlantic to examine relative changes in northern and southern sourced deep waters during the Last Glacial Maximum (LGM) and deglaciation. During the LGM, our transects show that water mass properties and boundaries in the South Atlantic and Pacific were different from one another. The Atlantic between ~1.0 and 2.5?km was more than 1‰ enriched in δ 13 C relative to the Pacific and remained more enriched through the deglaciation. During the LGM, Atlantic δ 18 O was ~0.5‰ more enriched than the Pacific, particularly below 2.5?km. This compositional difference between the deep portions of the basins implies independent deep water sources during the glaciation. We attribute these changes to a “deep gateway” effect whereby northern sourced waters shallower than the Drake Passage sill were unable to flow southward into the Southern Ocean because a net meridional geostrophic transport cannot be supported in the absence of a net east‐west circumpolar pressure gradient above the sill depth. We surmise that through the LGM and early deglaciation, shoaled northern sourced waters were unable to escape the Atlantic and contribute to deep water formation in the Southern Ocean. < </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> <div class="translation abstracttxt"> <span class="zhankaihshouqi fivelineshidden" id="abstract"> <span>机译：</span><Abstract Type =“main”XML：Lang =“en”> <标题类型=“main”>抽象</ title> >底栖多敏的增强型垂直梯度Δ 13 </ sup> c和δ在上次冰川期间，在大西洋和太平洋中，在大西洋和太平洋中的18个</ sup> o透露，海洋推翻循环的特点是北大西洋源性内部水域的浅层;尽管如此，我们对驱动这些冰川同位素模式的具体机制仍然不完整。在这里，我们比较<fi> cibicidoides </ fi> spp的高分辨率深度横断面。 Δ 13 </ sup> c和δ 18 </ sup> o从西南太平洋和西南大西洋审查最后一次冰川最大（LGM）和令人冰川地区北部和南部源深水的相对变化。在LGM期间，我们的横断面表明南部大西洋和太平洋的水质特性和边界彼此不同。在〜1.0和2.5 km之间的大西洋在相对于太平洋的Δ 13 </ sup> c中富含1次，并且仍然富有富集。在LGM期间，大西洋Δ 18 </ sup> o比太平洋更丰富，特别低于2.5 km。盆地的深部之间的这种组成差异在冰川期间意味着独立的深水源。我们将这些变化归因于“深入网关”效果，从而比德雷克通道窗台浅地进入南海无法向南进入南海洋，因为在没有净东西方的循环压力的情况下不能支持净调的地球滴车运输梯度在门槛深度上方。我们推动通过LGM和早期谴责，挖掘北方的水域无法逃离大西洋，并为南海的深水形成有助于深水形成。 < </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> </div> <div class="record"> <h2 class="all_title" id="enpatent33" >著录项</h2> <ul> <li> <span class="lefttit">来源</span> <div style="width: 86%;vertical-align: text-top;display: inline-block;"> <a href='/journal-foreign-28889/'>《Paleoceanography》</a> <b style="margin: 0 2px;">|</b><span>2017年第10期</span><b style="margin: 0 2px;">|</b><span>共18页</span> </div> </li> <li> <div class="author"> <span class="lefttit">作者</span> <p id="fAuthorthree" class="threelineshidden zhankaihshouqi"> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Sikes Elisabeth L.&option=202" target="_blank" rel="nofollow">Sikes Elisabeth L.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Allen Katherine A.&option=202" target="_blank" rel="nofollow">Allen Katherine A.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Lund David C.&option=202" target="_blank" rel="nofollow">Lund David C.;</a> </p> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zkzz" style="display: none;">展开▼</span> </div> </li> <li> <div style="display: flex;"> <span class="lefttit">作者单位</span> <div style="position: relative;margin-left: 3px;max-width: 639px;"> <div class="threelineshidden zhankaihshouqi" id="fOrgthree"> <p>Institute of Marine and Coastal SciencesState University of New Jersey RutgersNew Brunswick NJ USA;</p> <p>School of Earth and Climate SciencesUniversity of MaineOrono ME USA;</p> <p>Department of Marine SciencesUniversity of Connecticut Avery PointGroton CT USA;</p> </div> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zhdw" style="display: none;">展开▼</span> </div> </div> </li> <li > <span class="lefttit">收录信息</span> <span style="width: 86%;vertical-align: text-top;display: inline-block;"></span> </li> <li> <span class="lefttit">原文格式</span> <span>PDF</span> </li> <li> <span class="lefttit">正文语种</span> <span>eng</span> </li> <li> <span class="lefttit">中图分类</span> <span><a href="https://www.zhangqiaokeyan.com/clc/166.html" title="海洋学">海洋学;</a></span> </li> <li class="antistop"> <span class="lefttit">关键词</span> <p style="width: 86%;vertical-align: text-top;"> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=oxygen isotopes&option=203" rel="nofollow">oxygen isotopes;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=carbon isotopes&option=203" rel="nofollow">carbon isotopes;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Southern Ocean&option=203" rel="nofollow">Southern Ocean;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=glacial ocean circulation&option=203" rel="nofollow">glacial ocean circulation;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=intermediate water&option=203" rel="nofollow">intermediate water;</a> </p> <div class="translation"> 机译：氧同位素;碳同位素;南海;冰川海洋循环;中间水; 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Enhanced δ 1313 C and δ 1818 O Differences Between the South Atlantic and South Pacific During the Last Glaciation: The Deep Gateway Hypothesis

摘要

Enhanced δ ^{1313 C and δ ^{1818 O Differences Between the South Atlantic and South Pacific During the Last Glaciation: The Deep Gateway Hypothesis}}