Downcore Variations of Sedimentary Detrital (        <sup >238238        U/        <sup >232232        Th) Ratio: Implications on the Use of        <sup >230230        Th        <sub >xs</sub>xs        and        <sup >231231        Pa        <sub >xs</sub>xs        to Reconstruct Sediment Flux and Ocean Circulation

Missiaen L.; Pichat S.; Waelbroeck C.; Douville E.; Bordier L.; Dapoigny A.; Thil F.; Foliot L.; Wacker L.

摘要

Abstract > Excess 231 Pa and 230 Th ( 231 Pa <sub>xs</sub> and 230 Th <sub>xs</sub> ) can be used to reconstruct past oceanic sedimentation ( 230 Th‐normalized flux) and circulation changes (( 231 Pa/ 230 Th) <sub>xs,0</sub> , hereafter Pa/Th). These quantities are determined by computing the detrital and authigenic contributions from bulk sediment measurement. The method relies on the use of a chosen constant value of the detrital ( 238 U/ 232 Th) activity ratio (hereafter (U/Th) <sub>det</sub> ). In this study, we have extracted the detrital fraction of the sediments from North Atlantic deep‐sea core SU90‐08 (43°03′1N, 30°02′5W, 3,080m) and determined its (U/Th) <sub>det</sub> value over the last 40 ky. We find that (U/Th) <sub>det</sub> varied significantly through time with a minimum value of 0.4 during the Holocene and a maximum value of 0.7 during the Last Glacial Maximum (LGM). The sensitivity of sedimentary 230 Th‐normalized flux and Pa/Th is tested for our study site and for other North Atlantic sites. We show that the sensitivity is highly dependent on the core location and its terrigenous material supply. The 230 Th‐normalized flux and Pa/Th signals are very robust in cores with low detrital contributions, whereas they are very sensitive to (U/Th) <sub>det</sub> changes in cores with higher detrital contribution. In the latter case, changes in 230 Th‐normalized flux and Pa/Th due to the choice of a constant (U/Th) <sub>det</sub> can largely exceed the uncertainty on the 230 Th‐normalized flux and Pa/Th, inducing potential biases in the amplitude and temporal variability of reconstructed sedimentation and ocean circulation changes. </abstract> </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> > 过量的 231 </ sup> PA和 230 </ sup> th（ 231 </ sup> pa <sub> xs </ sub> 和 230 </ sup> 钍 <sub> xs </ sub> ）可用于重建过去海洋沉降（ 230 </ sup> Th-Normalize的助焊剂）和循环变化（（ 231 </ sup> PA / 230 </ sup> TH） <sub> xs，0 </ sub> ，此后PA / th）。这些数量是通过计算批量沉积物测量的脱毒和作用贡献来确定。该方法依赖于使用所选择的扭转量（ 238 </ sup> U / 232 </ sup> ）活动比率（以下，（U / T） <sub> det </ sub> ）。在这项研究中，我们已经从北大西洋深海核心SU90-08（43°03'1N，30°02'5W，3.080米）中提取了沉积物的滴乳部分并确定其（U / TH） <sub> det </ sub> 在过去的40 ky中的价值。我们发现（U / T） <sub> det </ sub> 在全新世期间，在全新世期间，最小值为0.4的时间显着变化，最大值为0.7期间的最后冰川最大值（LGM）。沉积的敏感性 230 </ sup> 对我们的学习网站和其他北大西洋地点进行了测试的Th-Normalized Flux和Pa / th。我们表明，灵敏度高度依赖于核心位置及其堆积材料供应。这 230 </ sup> Th-Normalize的通量和PA / TH信号在具有低污损贡献的核心中非常稳健，而它们对（U / TH）非常敏感 <sub> det </ sub> 污染贡献较高的核心的变化。在后一种情况下，更改 230 </ sup> 由于选择常数（U / TH），TH标准化的通量和PA / TH <sub> det </ sub> 可以在很大程度上超过不确定性 230 </ sup> Th标准化的通量和PA / TH，诱导重建沉降和海洋循环变化的幅度和时间变异性的潜在偏差。 </ p> </摘要> </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-23285/'>《Geochemistry, geophysics, geosystems》</a> <b style="margin: 0 2px;">|</b><span>2018年第8期</span><b style="margin: 0 2px;">|</b><span>共14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=Missiaen L.&option=202" target="_blank" rel="nofollow">Missiaen L.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Pichat S.&option=202" target="_blank" rel="nofollow">Pichat S.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Waelbroeck C.&option=202" target="_blank" rel="nofollow">Waelbroeck C.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Douville E.&option=202" target="_blank" rel="nofollow">Douville E.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Bordier L.&option=202" target="_blank" rel="nofollow">Bordier L.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Dapoigny A.&option=202" target="_blank" rel="nofollow">Dapoigny A.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Thil F.&option=202" target="_blank" rel="nofollow">Thil F.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Foliot L.&option=202" target="_blank" rel="nofollow">Foliot L.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Wacker L.&option=202" target="_blank" rel="nofollow">Wacker L.;</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>Laboratoire des Sciences du Climat et de l'Environnement LSCE/IPSLCEA‐CNRS‐UVSQ‐Université Paris‐SaclayGif‐sur‐Yvette France;</p> <p>Laboratoire des Sciences du Climat et de l'Environnement LSCE/IPSLCEA‐CNRS‐UVSQ‐Université Paris‐SaclayGif‐sur‐Yvette France;</p> <p>Laboratoire des Sciences du Climat et de l'Environnement LSCE/IPSLCEA‐CNRS‐UVSQ‐Université Paris‐SaclayGif‐sur‐Yvette France;</p> <p>Laboratoire des Sciences du Climat et de l'Environnement LSCE/IPSLCEA‐CNRS‐UVSQ‐Université Paris‐SaclayGif‐sur‐Yvette France;</p> <p>Laboratoire des Sciences du Climat et de l'Environnement LSCE/IPSLCEA‐CNRS‐UVSQ‐Université Paris‐SaclayGif‐sur‐Yvette France;</p> <p>Laboratoire des Sciences du Climat et de l'Environnement LSCE/IPSLCEA‐CNRS‐UVSQ‐Université Paris‐SaclayGif‐sur‐Yvette France;</p> <p>Laboratoire des Sciences du Climat et de l'Environnement LSCE/IPSLCEA‐CNRS‐UVSQ‐Université Paris‐SaclayGif‐sur‐Yvette France;</p> <p>Laboratoire des Sciences du Climat et de l'Environnement LSCE/IPSLCEA‐CNRS‐UVSQ‐Université Paris‐SaclayGif‐sur‐Yvette France;</p> <p>Laboratory of Ion Beam PhysicsETH ZürichZürich Switzerland;</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/163.html" title="地球物理学">地球物理学;</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=detrital correction&option=203" rel="nofollow">detrital correction;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=U‐series nuclides&option=203" rel="nofollow">U‐series nuclides;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=excess fraction&option=203" rel="nofollow">excess fraction;</a> </p> <div class="translation"> 机译：扭伤纠正;U系列核素;多数分数; </div> </li> </ul> </div> </div> <div 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Downcore Variations of Sedimentary Detrital ( 238238 U/ 232232 Th) Ratio: Implications on the Use of 230230 Th xsxs and 231231 Pa xsxs to Reconstruct Sediment Flux and Ocean Circulation

摘要

Downcore Variations of Sedimentary Detrital ( ^{238238 U/ ^{232232 Th) Ratio: Implications on the Use of ^{230230 Th _xsxs and ^{231231 Pa _xsxs to Reconstruct Sediment Flux and Ocean Circulation}}}}