A potential proxy for seasonal hypoxia: LA-ICP-MS Mn/Ca ratios in benthic foraminifera from the Yangtze River Estuary
A potential proxy for seasonal hypoxia: LA-ICP-MS Mn/Ca ratios in benthic foraminifera from the Yangtze River Estuary
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季节性缺氧的潜在指标：长江口底栖有孔虫的 LA-ICP-MS Mn/Ca 比值
DOI：
10.1016/j.gca.2018.11.007
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发表时间：
2019-01
影响因子：
5
通讯作者：
Fenglin Sun
中科院分区：
文献类型：
--
作者：
Xiaoyi Guo;Bochao Xu;William C. Burnett;Zhigang Yu;Shouye Yang;Xiangtong Huang;Feifei Wang;Haiming Nan;Peng Yao;Fenglin Sun
我们研究了底栖有孔虫中锰/钙比值作为缺氧的替代指标的可能性，缺氧在许多沿海地区已日益成为一个严重的环境问题。我们从长江口采集了样本，长江口是世界上最大、最强烈的季节性低氧带之一。为了获得不受污染影响的高质量的Mn/Ca数据，我们考察了两种不同的清洗方案和基于仪器的分析方法。我们的结果表明，一种相对简单的物理清洗方法与激光消融电感耦合等离子体质谱(LA-ICPMS)相结合，在单个样品上提供了良好的结果。我们的观察结果类似于对由数十个甚至数百个样品组成的溶液进行的电感耦合等离子体分析，这些样品涉及复杂的样品前处理。用LA方法分析了不同底水溶解氧(DO)浓度的长江口浮游动物(F.Decorus)活体样品的Mn/Ca比值。我们的结果表明，底栖有孔虫倒数第二个腔室中的Mn/Ca比值对底水DO浓度很敏感。我们还观察到有孔虫贝壳标本中不同腔室的锰/钙和镁/钙比值存在显著差异。这些波动很可能是对标本生长过程中环境水DO和温度变化的反应。将有孔虫的Mn/Ca比值与其他指标结合使用，可以为季节性低氧地区的低氧历史重建提供有力的工具。
We have examined the possible use of Mn/Ca ratios in benthic foraminifera as a proxy for hypoxia, which has increasingly become a serious environmental issue in many coastal zones. We collected samples from the Yangtze River Estuary, one of the largest and most intense seasonally hypoxic zones in the world. In order to obtain high quality Mn/Ca data, unaffected by contamination, we examined two different cleaning protocols and instrument-based analysis methods. Our results showed that a relatively simple physical cleaning approach coupled to laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) provided excellent results on single specimens. Our observations were comparable to ICP analyses of solutions made up from dozens or even hundreds of specimens and involving complicated sample pretreatments. Using the LA methodology, we analyzed Mn/Ca ratios from livingFlorilus decorus(F. decorus) specimens from stations in the Yangtze River Estuary with varying bottom water dissolved oxygen (DO) concentrations. Our results showed that Mn/Ca ratios in penultimate chambers of living benthic foraminifera are sensitive to bottom water DO concentrations. We also observed significant variations of both Mn/Ca and Mg/Ca ratios from different chambers within foraminiferal shell specimens. These fluctuations were likely a response to changing ambient water DO and temperature during the specimen’s growth history. Combined use of foraminiferal Mn/Ca ratios together with other proxies could provide a powerful tool for historical reconstruction of low oxygen conditions in seasonal hypoxia areas.
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影响因子：
3
作者：
S. Singh;S. Singh;R. Bhushan
通讯作者：
S. Singh;S. Singh;R. Bhushan
DOI：
--
发表时间：
2000-07
期刊：
--
影响因子：
--
作者：
J. Bernhard
通讯作者：
J. Bernhard
影响因子：
3.3
作者：
Chen, Chung-Chi;Gong, Gwo-Ching;Shiah, Fuh-Kwo
通讯作者：
Shiah, Fuh-Kwo
长江口及邻近陆架流动泥浆的早期成岩作用和自生矿物形成
影响因子：
2.8
作者：
Bin Zhao;Peng Yao;Thomas S. Bianchi;Yahong Xu;Hui Liu;Tiezhu Mi;Xiao-Hua Zhang;Jiwen Liu;Zhigang Yu
通讯作者：
Zhigang Yu
DOI：
10.1360/02yd9110
发表时间：
2002-12
期刊：
Science in China Series D: Earth Sciences
影响因子：
--
作者：
Daoji Li;Jing Zhang;Daji Huang;Ying Wu;Jun-Ze Liang
通讯作者：
Daoji Li;Jing Zhang;Daji Huang;Ying Wu;Jun-Ze Liang