Dual Isotope Measurements Reveal Zoning of Nitrate Processing in the Summer Changjiang (Yangtze) River Plume

Yan Xiuli; Xu Min Nina; Wan Xianhui Sean; Yang Jin‐Yu Terence; Trull Thomas W.; Dai Minhan; Kao Shuh‐Ji

摘要

Abstract >Riverine nitrogen input into the coastal zone has increased remarkably in recent decades. Yet its transformation and recycling within hydrodynamically active regions remains unclear. Using observations of nitrate concentration and dual isotopic composition across the Changjiang River plume within a three end‐member mixing model, we found deviations between the observed and expected values for mixing alone, revealing the nonconservative behavior of nitrate. Using cross correlations between concentrations and dual isotope deviations, we identified three nitrogen transformation zones, which correspond to separate portions of the plume. Nitrification and sedimentary denitrification occurred near the river mouth, nitrification prevailed further offshore under the plume, and finally, phytoplankton assimilation occurred in the outer surface plume (100?km offshore), where it was fueled by nitrate that had already been strongly modified by microbial processes. Information was assembled into a conceptual model offering an overview of nitrogen transformations in a large river plume. </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”>摘要</ title> >近几十年来沿海区的河流氮气投入显着增加。其在流体动力学接地内的转化和再循环仍不清楚。在三个端构件混合模型中使用硝酸浓度和双同位素组成的观察，我们发现观察到的和预期值单独混合的偏差，揭示硝酸盐的非必需行为。使用浓度和双同位素偏差之间的横相关，我们确定了三个氮转换区域，其对应于羽流的单独部分。硝化和沉积反硝化作用发生在靠近河口，硝化进一步盛行的离岸下的羽，终于，浮游植物吸收发生在外面羽（＆GT;100公里离岸），它是由硝酸加剧了已经强烈地修改通过微生物过程。信息被组装成一个概念模型，概述了大河羽流中的氮变换。</ 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-23539/'>《Geophysical Research Letters》</a> <b style="margin: 0 2px;">|</b><span>2017年第24期</span><b style="margin: 0 2px;">|</b><span>共9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=Yan Xiuli&option=202" target="_blank" rel="nofollow">Yan Xiuli;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Xu Min Nina&option=202" target="_blank" rel="nofollow">Xu Min Nina;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Wan Xianhui Sean&option=202" target="_blank" rel="nofollow">Wan Xianhui Sean;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Yang Jin‐Yu Terence&option=202" target="_blank" rel="nofollow">Yang Jin‐Yu Terence;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Trull Thomas W.&option=202" target="_blank" rel="nofollow">Trull Thomas W.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Dai Minhan&option=202" target="_blank" rel="nofollow">Dai Minhan;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Kao Shuh‐Ji&option=202" target="_blank" rel="nofollow">Kao Shuh‐Ji;</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>State Key Laboratory of Marine Environmental Science College of Ocean and Earth SciencesXiamen UniversityXiamen China;</p> <p>State Key Laboratory of Marine Environmental Science College of Ocean and Earth SciencesXiamen UniversityXiamen China;</p> <p>State Key Laboratory of Marine Environmental Science College of Ocean and Earth SciencesXiamen UniversityXiamen China;</p> <p>State Key Laboratory of Marine Environmental Science College of Ocean and Earth SciencesXiamen UniversityXiamen China;</p> <p>Antarctic Climate and Ecosystems Cooperative Research Centre University of Tasmania and CSIRO Oceans and AtmosphereHobart Australia;</p> <p>State Key Laboratory of Marine Environmental Science College of Ocean and Earth SciencesXiamen UniversityXiamen China;</p> <p>State Key Laboratory of Marine Environmental Science College of Ocean and Earth SciencesXiamen UniversityXiamen China;</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=Changjiang River plume&option=203" rel="nofollow">Changjiang River plume;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=dual isotope&option=203" rel="nofollow">dual isotope;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=nitrate&option=203" rel="nofollow">nitrate;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=isotope effect&option=203" rel="nofollow">isotope effect;</a> </p> <div class="translation"> 机译：长江羽毛;双同位素;硝酸盐;同位素效应; 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