Nitrate Isotope Distribution in the Subarctic and Subtropical North Pacific

Yoshikawa Chisato; Makabe Akiko; Matsui Yohei; Nunoura Takuro; Ohkouchi Naohiko

摘要

Abstract > Nitrogen and oxygen isotopic compositions of nitrate (δ 15 N <sub>Nitrate</sub> and δ 18 O <sub>Nitrate</sub> ) were determined along 47°N in the subarctic North Pacific and 149°E in the western North Pacific. In the western subarctic gyre, known as a high‐nutrient, low‐chlorophyll region, the δ 15 N <sub>Nitrate</sub> and the differences between δ 15 N <sub>Nitrate</sub> and δ 18 O <sub>Nitrate</sub> (herein Δ(15–18)) in the intermediate water were significantly lower than in the surrounding area. The 15 N‐depleted nitrate was generated by nitrified nitrate from the remineralization of organic matter produced by the partial consumption of the surface nitrate pool. Between the western subarctic gyre and the Alaskan gyre, there was a 0.2‰ increase in δ 15 N <sub>Nitrate</sub> and a 0.3‰ increase in Δ(15–18) in the intermediate water associated with a 7.2‐μM decrease in the nitrate concentration at the surface. Assuming Rayleigh distillation kinetics, the increase in utilization of the surface nitrate pool between the western subarctic gyre and the Alaskan gyre (from 29% to 85%) corresponds to a change in δ 15 N of organic matter from 2.6‰ to 4.9‰. The 15 N enrichment of intermediate nitrate toward the east resulted from the increase in utilization. Moreover, the 15 N‐depleted nitrate in the mixed‐layer water of the western subtropical gyre was affected by N <sub>2</sub> fixation in the Kuroshio water, whereas the 15 N‐enriched nitrate in the intermediate water at the western margin of North America was affected by water column denitrification. The δ 15 N sediment record in the western subarctic North Pacific likely reflects past changes in the high‐nutrient, low‐chlorophyll region but may also be controlled by water column denitrification and N <sub>2</sub> fixation. </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> > 硝酸氮和氧同位素组合物（δ 15 </ sup> N. <sub>硝酸盐</ sub> 和δ. 18 </ sup> O. <sub>硝酸盐</ sub> ）在北北太平洋（北北太平洋西部）和149°E中沿47°N确定。在西部亚虫病里，称为高营养，低叶绿素区域，δ 15 </ sup> N. <sub>硝酸盐</ sub> δ之间的差异 15 </ sup> N. <sub>硝酸盐</ sub> 和δ. 18 </ sup> O. <sub>硝酸盐</ sub> （这里中间水中的δ（15-18）显着低于周围区域。这 15 </ sup> 通过硝化硝酸盐从通过表面硝酸盐池部分消耗产生的有机物质的剩余硝酸盐产生N-耗尽的硝酸盐。西部亚虫病里和阿拉斯加·吉伊尔之间，δ增加0.2‰ 15 </ sup> N. <sub>硝酸盐</ sub> 在表面上的硝酸盐浓度下降7.2μm，中间水中的中间水中的δ（15-18）中的δ（15-18）增加0.3。假设瑞利蒸馏动力学，西部亚治疗和阿拉斯加·吉尔（Alaskan Gyre之间的表面硝酸盐池的利用率的增加对应于δ的变化 15 </ sup> 从2.6‰到4.9‰的有机物质n。这 15 </ sup> n富集向东的中间硝酸盐因利用率而导致。而且，这是 15 </ sup> 在西部亚热带孢子的混合层水中的N-耗尽硝酸盐受到n的影响 <sub> 2 </ sub> 固定在Kuroshio水中，而是 15 </ sup> 北美西部边缘的中间水中中间水中的硝酸盐受水柱反硝化的影响。 δ 15 </ sup> N西部域北部太平洋的沉积物记录可能反映了高营养，低叶绿素地区的过去变化，但也可以通过水柱反硝化和n控制 <sub> 2 </ sub> 固定。 </ 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7期</span><b style="margin: 0 2px;">|</b><span>共13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=Yoshikawa Chisato&option=202" target="_blank" rel="nofollow">Yoshikawa Chisato;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Makabe Akiko&option=202" target="_blank" rel="nofollow">Makabe Akiko;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Matsui Yohei&option=202" target="_blank" rel="nofollow">Matsui Yohei;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Nunoura Takuro&option=202" target="_blank" rel="nofollow">Nunoura Takuro;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Ohkouchi Naohiko&option=202" target="_blank" rel="nofollow">Ohkouchi Naohiko;</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>Department of BiogeochemistryJapan Agency for Marine‐Earth Science and Technology (JAMSTEC)Yokosuka Japan;</p> <p>Research and Development Center for Submarine ResourcesJapan Agency for Marine‐Earth Science and Technology (JAMSTEC)Yokosuka Japan;</p> <p>Research and Development Center for Submarine ResourcesJapan Agency for Marine‐Earth Science and Technology (JAMSTEC)Yokosuka Japan;</p> <p>Project Team for Development of New‐Generation Research Protocol for Submarine ResourcesJapan Agency for Marine‐Earth Science and Technology (JAMSTEC)Yokosuka Japan;</p> <p>Department of BiogeochemistryJapan Agency for Marine‐Earth Science and Technology (JAMSTEC)Yokosuka Japan;</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=nitrogen isotopes&option=203" rel="nofollow">nitrogen isotopes;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=nitrogen fixation&option=203" rel="nofollow">nitrogen fixation;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=denitrification&option=203" rel="nofollow">denitrification;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=North Pacific&option=203" rel="nofollow">North Pacific;</a> </p> <div class="translation"> 机译：氮同位素;氮固定;反硝化;北太平洋; 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