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Understanding the sources of organic matter to the ODZ is necessary to predict how biogeochemical cycles will respond to ocean changes. Size fractionated (5-" /> <meta property="og:site_name" content="Authorea" /> <meta property="article:modified_time" content="2024-11-28 04:43:38 UTC" /> <link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/mathquill/0.10.1/mathquill.min.css"/> <meta id='mathquillmin' class='mq-editable-field'> <script type="text/javascript"> var tag = document.querySelector('meta#mathquillmin') var tagStyle = window.getComputedStyle(tag).getPropertyValue('display') if (!tagStyle || tagStyle == 'auto' ){ var message = "mathquill.min.0.10.1.css failed to load, falling back to local copy" localLink = document.createElement('link'); localLink.rel = "stylesheet"; localLink.type = "text/css"; localLink.href = "/assets/mathquill.min.0.10.1.css"; document.head.appendChild(localLink); delete localLink; } </script> <meta property="article:publisher" content="https://www.authorea.com" /> <link rel="stylesheet" type="text/css" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.18.1/styles/default.min.css"/> <meta id='defaultmin' class='hljs-strong'> <script type="text/javascript"> var tag = document.querySelector('meta#defaultmin') var tagStyle = window.getComputedStyle(tag).getPropertyValue('font-weight') if (!tagStyle || tagStyle == 'auto' ){ var message = "default.min.css failed to load, falling back to local copy" localLink = document.createElement('link'); localLink.rel = "stylesheet"; localLink.type = "text/css"; localLink.href = "/assets/default.min.css"; document.head.appendChild(localLink); delete localLink; } </script>  <meta name="citation_publisher" content="Authorea"/> <meta name="citation_title" content="Size fractionated suspended organic carbon and nitrogen from the offshore Eastern Tropical North Pacific Oxygen Deficient Zone suggest contributions of picocyanobacteria and vertically migrating metazoans to organic matter"/> <meta name="citation_abstract" content="Oxygen Deficient Zones (ODZs) are key areas of N loss, a process dependent on organic matter. Understanding the sources of organic matter to the ODZ is necessary to predict how biogeochemical cycles will respond to ocean changes. Size fractionated (5-20, 20-53, 53-180, 180-500, >500 µm) particulate organic C and N (POM) concentration and isotopic composition depth profiles from three stations in the offshore Eastern Tropical North Pacific (ETNP) ODZ were used to create previously missing ETNP specific particle size to carbon and nitrogen relationships for models, while gaining insights into the origins of POM in the ODZ. Since the within-ODZ Prochlorococcus assimilate nitrite, we used the resulting highly depleted d15N signal to trace organic matter of cyanobacterial origin to medium sized particles at the secondary chlorophyll maximum (SCM), and to >500 µm particles directly below the SCM. This organic nitrogen was consumed in the upper ODZ. Other POM maxima were seen at the zooplankton vertical migration maxima with the increase in POM marked in the 5-20 µm fraction. In the deep ODZ, below the zooplankton migration depth, POM concentrations in the 5-20 µm fraction were unusually small, the C:N ratios were extremely high (>20), and d15N was enriched (8-12‰), indicating degraded material. In deep samples, d13C was more depleted in larger particle size and correlated with enriched d15N, indicating increased degradation in 53-500 µm particles. This trend suggests an additional source of small particles, such as from in situ production, rather than just the fragmentation of large particles."/> <meta name="citation_doi" content="10.22541/essoar.173046855.50289201/v1"/> <meta name="citation_pdf_url" content="https://essopenarchive.org/doi/pdf/10.22541/essoar.173046855.50289201" /> <meta name="citation_author" content="Clara A Fuchsman"> <meta name="citation_author" content="Jacob Adrian Cram"> <meta name="citation_publication_date" content="2024/11/01"> <meta name="citation_journal_title" content="Authorea Preprints"> <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/mathquill/0.10.1/mathquill.min.js"></script> <script type="text/javascript"> try{if (!(MathQuill)){ throw new Error("") }} catch(e){ var message = 'mathquill.min failed to load, falling back to local copy' console.log(message); document.write("<script src=\"/assets/mathquill.min.0.10.1.js\"><\/script>"); } </script> <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.10.8/xlsx.full.min.js"></script> <script type="text/javascript"> try{if (!(XLSX)){ throw new Error("") }} catch(e){ var message = 'xlsx.full.min failed to load, falling back to local copy' console.log(message); document.write("<script src=\"/assets/xlsx.full.min.0.10.8.js\"><\/script>"); } </script> <script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.18.1/highlight.min.js"></script> <script type="text/javascript"> try{if (!(hljs)){ throw new Error("") }} catch(e){ var message = 'highlight.min failed to load, falling back to local copy' console.log(message); document.write("<script src=\"/assets/highlight.min.9.18.1.js\"><\/script>"); } </script> </head> <body> <div id="navbar" class="navbar__white"> <div class="navbar__left-side" > <a href="/" class="navbar__logo_anchor"> <img class="navbar__logo_secondary" src="https://d197for5662m48.cloudfront.net/images/institution/20904/whitelabel_logo_image/c7cb3398baf9966b5dd1934d992c30f2.png" /> </a> </div> <div class="navbar__article-links"> <div class="comments-button"></div> </div> <div class="navbar__right-side-content--collapse"> <a href="#" class="navbar__collapse-toggle"> <img src="https://d197for5662m48.cloudfront.net/assets/icons/hamburger-ea91f5c35622f90ca466db90b6b2cbc676402c3cce254852350b610ad80aac76.svg" /> </a> <div class="navbar-collapse__dropdown hide"> <div class="navbar-collapse__title">AUTHOREA</div> <a class="navbar-collapse__link" href="/signin">Log in</a> <a class="navbar-collapse__link" href="/signup">Sign Up</a> <a class="navbar-collapse__link" href="/preprints">Browse Preprints</a> </div> </div> <div class="navbar__right-side-content">  <a class="navbar__dropdown-toggle signin-link" href="/signin">LOG IN</a> <a class="navbar__dropdown-toggle signup-link" href="/signup">SIGN UP</a>  </div> </div> <script> jQuery(document).ready(function() { $('#help-button').click( function(e){ $.get('/help-modal-content', function(data) { $('#help-modal-content').html(data); }); }); }); </script> <div class='article-react-body'> <div class='article-react-content'> <div style="height: 60px"></div> <div class="container-fluid"> <div class="row-fluid"> <div class="span12 centered-article-container">  <meta name="csrf-param" content="authenticity_token" /> <meta name="csrf-token" content="k1i-jLdA96m0FfzGQhnBZXBI29PBo_OyRv7tvbAK2h3SM2_dzGMmETvNPKBxbBC00ezfuGWEbmqxlKLZS8bVNQ" /> <div class="article-unit span11 article-padded-container"> <div class="loading-icon-container"> <div class="au-loading-icon"> <svg class="au-loading-icon__svg" xmlns="http://www.w3.org/2000/svg" width="80px" height="60px" viewBox="5 0 80 60"> <path class="wave" fill="none" stroke="#30a970" stroke-width="2" stroke-linecap="round"> </path> </svg> <p id='au-loading-message'>loading page</p> </div> <script type="text/javascript"> const path = document.querySelector('.wave'); const m = 0.512286623256592433; function buildWave(w, h) { const a = h / 4; const y = h / 2; const pathData = [ 'M', w * 0, y + a / 2, 'c', a * m, 0, -(1 - a) * m, -a, a, -a, 's', -(1 - a) * m, a, a, a, 's', -(1 - a) * m, -a, a, -a, 's', -(1 - a) * m, a, a, a, 's', -(1 - a) * m, -a, a, -a, 's', -(1 - a) * m, a, a, a, 's', -(1 - a) * m, -a, a, -a, 's', -(1 - a) * m, a, a, a, 's', -(1 - a) * m, -a, a, -a, 's', -(1 - a) * m, a, a, a, 's', -(1 - a) * m, -a, a, -a, 's', -(1 - a) * m, a, a, a, 's', -(1 - a) * m, -a, a, -a, 's', -(1 - a) * m, a, a, a, 's', -(1 - a) * m, -a, a, -a ].join(' '); path.setAttribute('d', pathData); } buildWave(90, 60); window.setTimeout(function (){ if(!window._store){ $('.au-loading-icon').fadeOut() $('.au-loading-icon').after('<div class="alert" id="load-fail-message">Article failed to load. 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src="https://d197for5662m48.cloudfront.net/assets/icons/omniauth/orcid-ca37582cd91a671ed5cec57770e0e96c01b4b79b8b5b75d8598fc1ddac18c974.svg" /></a><div class="author-popover-affiliations">University of Maryland Center for Environmental Science</div><a class="author-popover-profile" href="/users/531468">Author Profile</a></div><div class="author-popover-avatar"><img src="https://d197for5662m48.cloudfront.net/images/user/531468/profile_image/medium-2d8cd3605ea3ea0c30af67b0d97ffedd.jpeg" /></div><div class="author-popover-arrow" data-popper-arrow=""></div></div><script data-cfasync="false" src="/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js"></script><script>document.addEventListener('DOMContentLoaded', function () { let popperInstance = null; const authors = document.querySelectorAll('.preview-author-name') const popperOptions = { placement: 'bottom', modifiers: [{ name: 'flip', enabled: false, }, { name: 'offset', options: { offset: [0, 12] } }] } function showPopover (author, popover) { popover.setAttribute('data-show', '') popperInstance = Popper.createPopper(author, popover, popperOptions) } function hidePopover () { if (!popperInstance) return const el = document.querySelector('.author-popover[data-show]') if (!el) return el.removeAttribute('data-show') popperInstance.destroy() popperInstance = null } authors.forEach(author => { const id = author.getAttribute('data-collab-id') const popover = document.querySelector(`.author-popover[data-collab-id="${id}"]`) author.addEventListener('click', () => { if (popperInstance) { hidePopover() } showPopover(author, popover) }) }) document.addEventListener('click', (e) => { if (!popperInstance) return const container = document.querySelector('.preview-author-list') if (container.contains(e.target)) return hidePopover() }) })</script><div class="article-paragraph preview-abstract"><h2 class="preview-abstract-heading">Abstract</h2><div>Oxygen Deficient Zones (ODZs) are key areas of N loss, a process dependent on organic matter. Understanding the sources of organic matter to the ODZ is necessary to predict how biogeochemical cycles will respond to ocean changes. Size fractionated (5-20, 20-53, 53-180, 180-500, >500 µm) particulate organic C and N (POM) concentration and isotopic composition depth profiles from three stations in the offshore Eastern Tropical North Pacific (ETNP) ODZ were used to create previously missing ETNP specific particle size to carbon and nitrogen relationships for models, while gaining insights into the origins of POM in the ODZ. Since the within-ODZ Prochlorococcus assimilate nitrite, we used the resulting highly depleted d15N signal to trace organic matter of cyanobacterial origin to medium sized particles at the secondary chlorophyll maximum (SCM), and to >500 µm particles directly below the SCM. This organic nitrogen was consumed in the upper ODZ. Other POM maxima were seen at the zooplankton vertical migration maxima with the increase in POM marked in the 5-20 µm fraction. In the deep ODZ, below the zooplankton migration depth, POM concentrations in the 5-20 µm fraction were unusually small, the C:N ratios were extremely high (>20), and d15N was enriched (8-12‰), indicating degraded material. In deep samples, d13C was more depleted in larger particle size and correlated with enriched d15N, indicating increased degradation in 53-500 µm particles. This trend suggests an additional source of small particles, such as from in situ production, rather than just the fragmentation of large particles.</div></div><div class="review-timeline"><div class="dashboard-container"><div class="publication-status-footer"><h4 class="header">Preprint timeline</h4></div><div class="events-container"><div class="version-container"><div class="entry"><span class="bar"></span><span class="indicator"></span><span class="time-box"><span>30 Oct 2024</span></span><span class="message">Submitted to <b><i>ESS Open Archive </i></b> <a target="_blank" rel="noopener noreferrer" href="/inst/20904"><i class="fas fa-external-link-alt"></i></a></span></div><div class="entry"><span class="bar"></span><span class="indicator"></span><span class="time-box"><span>01 Nov 2024</span></span><span class="message">Published in <b><i>ESS Open Archive </i></b></span></div></div></div></div></div><div class="preview-publication-status"></div></div></div> <div id="article-content"> </div> </div>  <div style="clear: both"></div>  <div id='article-sidebar-portal'></div> <script> initialServerStore = {"article":{"titleBlock":{"block_content":null,"type":"htmlBlock","html":"Size fractionated suspended organic carbon and nitrogen from the\noffshore Eastern Tropical North Pacific Oxygen Deficient Zone suggest\ncontributions of picocyanobacteria and vertically migrating metazoans to\norganic matter","render_report":null,"raw":"Size fractionated suspended organic carbon and nitrogen from the\noffshore Eastern Tropical North Pacific Oxygen Deficient Zone suggest\ncontributions of picocyanobacteria and vertically migrating metazoans to\norganic matter","name":"title","format":"html","url":"/users/561608/articles/1236889/master/file/title.html","folder_url":"/users/561608/articles/1236889/master/folder/.","path":"title.html","old_path":null,"collapsed":false,"sha":"3394e29b7a0e10cd3202ff49e578cefc359f67b6","captionBlock":null,"has_data":false,"has_ipython_notebook":false,"config":null},"id":1236889,"sha":"d33c28b281869cd375ff86a7a0028ced0edb3f92","blocks":[],"oldBlocks":[],"oldLayout":null,"online":true,"layout":"abstract.html\ndata/1011254_0_merged_1728866245/1011254_0_merged_1728866245.pdf\ndata/Fuchsman_size fractionated suspended organic carbon and nitrogen from the offshore Eastern Tropical North Pacific/Fuchsman_size fractionated suspended organic carbon and nitrogen from the offshore Eastern Tropical North Pacific.docx\ndata/Fuchsman_Size_fractionated_Supplemental_Figures/Fuchsman_Size_fractionated_Supplemental_Figures.pdf\n","references":[],"referenceSorting":{"key":"default","ascending":true},"citationHash":{},"commits":null,"version":0},"commitToView":"d33c28b281869cd375ff86a7a0028ced0edb3f92","commentToView":null,"onboarding":false} initialFlashMessagesForReact = [] </script> <script src="https://d197for5662m48.cloudfront.net/assets/editable_article_manifest_react-ddeeb8194703aca81267c69ccb1330a3afea795f89456883e9fb9d4f9047c520.js" defer="defer"></script> <link rel="stylesheet" type="text/css" href="//cdnjs.cloudflare.com/ajax/libs/KaTeX/0.11.1/katex.min.css"/> <meta id='katexmin' class='katex'> <script type="text/javascript"> var tag = document.querySelector('meta#katexmin') var tagStyle = window.getComputedStyle(tag).getPropertyValue('font-family') if (!tagStyle || tagStyle == 'auto' ){ var message = "katex.min.0.11.1.css failed to load, falling back to local copy" localLink = document.createElement('link'); 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