{"id":3194,"date":"2019-10-21T14:00:00","date_gmt":"2019-10-21T21:00:00","guid":{"rendered":"https:\/\/dornsife.usc.edu\/news\/stories\/catastrophic-events-carry-forests-of-trees-thousands-of-miles-to-a-burial-at-sea\/"},"modified":"2023-04-19T11:06:20","modified_gmt":"2023-04-19T18:06:20","slug":"sediments-sequester-carbon-from-climate","status":"publish","type":"post","link":"https:\/\/dornsife.usc.edu\/news\/stories\/sediments-sequester-carbon-from-climate\/","title":{"rendered":"Catastrophic events carry forests of trees thousands of miles to a burial at sea"},"content":{"rendered":"\n\n\n    \n            \n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--article-hero \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--article-hero\"\n    \n      >\n\n    \n<div class=\"inner-wrapper\">\n          \n<div class=\"f--field f--image\">\n\n    \n    \n    \n    \n    \n    \n              \n      <img\n                            data-src=\"https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2023\/04\/story-3095-768x432.jpg\"\n          data-srcset=\"https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2023\/04\/story-3095-1280x720.jpg 1280w,https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2023\/04\/story-3095-768x432.jpg 768w\"          data-sizes=\"(min-width:1200px) 75vw, (min-width:768px) 83vw, 100vw\"          class=\"lazyload\"\n        \n                  alt=\"Catastrophic events carry forests of trees thousands of miles to a burial at sea\"\n        \n        \n                                      \/>\n\n    \n    \n  \n  \n\n<\/div>\n  \n      <div class=\"image-caption\">\n          \n<div class=\"f--field f--description\">\n\n    \n  Monsoonal storms like that shown here may cause masses of trees to flow into the Bay of Bengal to be buried in the sediments on the ocean floor. (Photo: Christian France-Lanord\/Universit\u00e9 de Lorraine.)\n\n\n<\/div>\n    <\/div>\n  \n  <div class=\"text-wrapper\">\n          <nav aria-label=\"Breadcrumb\" class=\"breadcrumbs\">\n        <ul>\n                      <li><a href=\"\/news\/stories\/\">News<\/a><\/li>\n                      <li><a href=\"\/news\/stories\/\/?category=dornsife-global\">Dornsife Global<\/a><\/li>\n                  <\/ul>\n      <\/nav>\n    \n              \n<div class=\"f--field f--page-title\">\n\n    \n  <h1>Catastrophic events carry forests of trees thousands of miles to a burial at sea<\/h1>\n\n\n<\/div>\n    \n          <div class=\"subtitle\">\n            \n<div class=\"f--field f--description\">\n\n    \n  Geology researchers at USC Dornsife find, for the first time, evidence that fresh wood can move from its home far inland to settle deep in the ocean, a discovery that appears to add to current models of Earth\u2019s carbon cycle. <strong>[3\u00be min read]<\/strong>\n\n\n<\/div>\n      <\/div>\n    \n           <strong class=\"author-field\"><span >By<\/span><a href=\"mailto:communication@dornsife.usc.edu\">Darrin S. Joy<\/a><\/strong>\n    \n          <span class=\"post-date-field\">October 21, 2019<\/span>\n      <\/div>\n<\/div>\n\n\n  <\/div><\/div>\n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--social-share \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--social-share\"\n    \n      >\n\n    \n  <div class=\"content-wrapper\">\n    <span class=\"a2a_kit a2a_kit_size_32 addtoany_list\" style=\"line-height: 32px;\">\n      <span class=\"title\">\n        Share\n      <\/span>\n                        <a class=\"a2a_button_copy_link\" target=\"_blank\" href=\"\/#copy_link\" rel=\"nofollow noopener\" title=\"Link\">\n            <span class=\"a2a_svg a2a_s__default a2a_s_copy_link\">\n              <svg height=\"19\" viewBox=\"0 0 19 19\" width=\"19\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"m7.43475275 9.52380952-2.17490843 2.26076008c-1.08745421 1.058837-1.68841575 2.518315-1.68841575 4.0350275 0 1.5167124.60096154 2.9475732 1.68841575 4.0350274 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10.8c-1.087-2.114-4.046-6.053-6.798-7.995C2.566.944 1.561 1.266.902 1.565C.139 1.908 0 3.08 0 3.768c0 .69.378 5.65.624 6.479c.815 2.736 3.713 3.66 6.383 3.364c.136-.02.275-.039.415-.056c-.138.022-.276.04-.415.056c-3.912.58-7.387 2.005-2.83 7.078c5.013 5.19 6.87-1.113 7.823-4.308c.953 3.195 2.05 9.271 7.733 4.308c4.267-4.308 1.172-6.498-2.74-7.078a8.741 8.741 0 0 1-.415-.056c.14.017.279.036.415.056c2.67.297 5.568-.628 6.383-3.364c.246-.828.624-5.79.624-6.478c0-.69-.139-1.861-.902-2.206c-.659-.298-1.664-.62-4.3 1.24C16.046 4.748 13.087 8.687 12 10.8\"  fill-rule=\"evenodd\" \/>\n              <\/svg>\n            <\/span>\n            <span class=\"a2a_label visually-hidden\">Bluesky<\/span>\n          <\/a>\n                                <a class=\"a2a_button_email\" target=\"_blank\" href=\"\/#email\" rel=\"nofollow noopener\" title=\"E-mail\">\n            <span class=\"a2a_svg a2a_s__default a2a_s_print\">\n              <svg height=\"12\" viewBox=\"0 0 18 12\" width=\"18\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"m8.14285714 9.42857143c-.17142857 0-.34285714 0-.51428571.08571428l7.28571427 6.34285719c.3428572.2571428.6857143.2571428.9428572 0l7.2857142-6.34285719c-.0857142-.08571428-.2571428-.08571428-.4285714-.08571428zm-1.28571428 1.11428567v.1714286 8.5714286c0 .6857143.6 1.2857143 1.28571428 1.2857143h14.57142856c.6857143 0 1.2857143-.6 1.2857143-1.2857143v-8.5714286c0-.0857143 0-.0857143 0-.1714286l-7.2 6.3428572c-.7714286.6857143-1.8857143.6857143-2.6571429 0z\" fill-rule=\"evenodd\" transform=\"translate(-6 -9)\"\/><\/svg>\n            <\/span>\n            <span class=\"a2a_label visually-hidden\">Email<\/span>\n          <\/a>\n                  <\/span>\n  <\/div>\n\n  <\/div><\/div>\n  \n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--rich-text \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--rich-text\"\n    \n      >\n\n    \n      \n<div class=\"f--field f--wysiwyg\">\n\n    \n  <p>Flooding from torrential rains caused by cyclones and monsoonal storms, as well as other catastrophic events, are responsible for moving huge amounts of fresh wood to a watery grave deep under the ocean, according to Earth scientists.<\/p>\n<p>Their research, published in the <a href=\"https:\/\/www.pnas.org\/content\/early\/2019\/10\/15\/1913714116\" target=\"_blank\"><i>Proceedings of the National Academy of Sciences<\/i><\/a> on Oct. 21, shows the first-ever evidence that trees may travel thousands of miles from their mountain homes to settle in the vast sediments extending under the sea from river mouths.<\/p>\n<p><strong>Wood from ancient trees found in the deep sea<\/strong><\/p>\n<p>Researchers led by <a href=\"https:\/\/dornsife.usc.edu\/cf\/faculty-and-staff\/faculty.cfm?pid=1019695\" target=\"_blank\">Sarah Feakins<\/a>, associate professor of Earth sciences at the USC Dornsife College of Letters, Arts and Sciences, examined core samples taken from the ocean floor over a thousand miles offshore from Bangladesh, in the Bay of Bengal.<\/p>\n<p>Once at the target point at sea, the U.S.-operated research ship <a href=\"https:\/\/joidesresolution.org\/\" target=\"_blank\"><i>R\/V Joides Resolution<\/i><\/a>, which is part of the <a href=\"https:\/\/www.iodp.org\/\" target=\"_blank\">International Ocean Discovery Program<\/a>, extended a drill mechanism more than two miles down from the ocean&rsquo;s surface to its floor and drilled more than a half a mile down into the sediments. They then carried the samples back to the lab, where the research team combed through the resulting core samples. They discovered wood chips in the sandy layers dating back as far as 19 million years.<\/p>\n<p>Their analysis showed that wood in most layers came from lowland sources, but one layer contained wood from trees high in the mountains.<\/p>\n<p>&ldquo;We found pristine pieces of conifers,&rdquo; Feakins said. &ldquo;These trees grow two miles above sea level, up in the Himalayas.&rdquo;<\/p>\n<div class=\"news-image-landscape news-image-right\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/sites\/7\/migration-uploads\/Sediment-core-camilo-ponton_sec_630x406-3095.jpg\"><\/p>\n<p><em>From left:<\/em> Camilo Ponton, a former Earth sciences postdoc at USC Dornsife, and Valier Galy of Woods Hole Oceanographic Institution examine a sediment core sample. (Photo: Jarrett Cruz and JOIDES Resolution Science Operator\/ International Ocean Discovery Program.)<\/p>\n<\/div>\n<p>The trees likely were uprooted during the last ice age by a massive release of water from the breach of a natural dam created by a glacier, landslide or similar land feature. In what must have been a surge of water, the trees rode rivers thousands of miles from Nepal through Bangladesh and into the Bengal Fan, the largest underwater sediment accumulation in the world.<\/p>\n<p>The scientists, searching through other layers in the core sample, found wood from the lowlands, as well. These wood chips likely were carried to the sea by torrential rains and flooding during monsoons or cyclones that occurred many time across the 19-million-year time span.<\/p>\n<p><strong>Rivers export trees<\/strong><\/p>\n<p>Aside from revealing the astounding distance trees may be carried by rivers to the sea due to natural events, the study finds this tree wood is an important part of the <a href=\"https:\/\/earthobservatory.nasa.gov\/features\/CarbonCycle\" target=\"_blank\">carbon cycle<\/a>.<\/p>\n<p>Most of the planet&rsquo;s carbon resides in rock, but the remainder flows in various forms between land, air and ocean, making its way through plants, animals and microbes as it does so.<\/p>\n<p>In the air, carbon may be part of carbon dioxide, methane or other greenhouse gases, which can trap heat in the atmosphere, causing the greenhouse effect.<\/p>\n<p>The carbon bound by plants, on the other hand, remains sequestered from the atmosphere until metabolism, decay or burning releases it, usually shortly after death. Yet, rapid transport events by rivers bypass decomposition that normally follows tree-fall and instead deliver fresh wood to be entombed in sediment on the seafloor.<\/p>\n<p>The new findings point to a previously unrecognized way carbon can remain locked away, effectively removed from the carbon cycle, for millions of years. The abundance of wood suggests that the prior estimates of carbon exported by modern Ganges-Brahmaputra rivers were low, and now accounting for wood, the amount of carbon exported and buried may be 50% greater than previously thought.<\/p>\n<p>&ldquo;As we&rsquo;ve tried to calculate the amount of carbon in all parts of the carbon cycle, we didn&rsquo;t know about this forest of fragmented trees buried in the ocean floor,&rdquo; Feakins said. &ldquo;Now we need to add it to the equation.&rdquo;<\/p>\n<p><strong>Carbon drawdown<\/strong><\/p>\n<p>Feakins also noted that the findings emphasize the importance of free-flowing rivers in carbon sequestration.<\/p>\n<p>&ldquo;Over the past 50 million years, average global temperatures fell significantly,&rdquo; Feakins said, as did atmospheric CO<sub>2<\/sub> levels. This was due to natural processes &mdash; such as weathering of rocks (including the Himalayas) and burial of plant carbon offshore &mdash; that draw carbon out of the atmosphere. This study points to the need to inventory millions of years of carbon sequestration in these elusive woody sediment layers without which greenhouse gases would have kept temperatures high.<\/p>\n<p>Further, the 50 million-year-long cooling trend has rapidly <a href=\"https:\/\/www.pbs.org\/wgbh\/nova\/article\/climate-change-reversing-cooling-trend\/\" target=\"_blank\">reversed in recent decades<\/a> due to human activity, which has raised CO<sub>2<\/sub> levels close to those of 3 million years ago. Feakins notes that, in parallel to emissions reductions, understanding the carbon sequestration services that natural ecosystem and rivers perform can inform decisions about forest management, dam removal and other issues with regard to their potential to help manage the carbon cycle.<\/p>\n<p><strong>About the study<\/strong><\/p>\n<p>Feakins is corresponding author on the study. Other authors on the study include Hyejung Lee and Camilo Ponton, both former USC Dornsife researchers; Valier Galy of Woods Hole Oceanographic Institution; Xiaojuan Feng of the Chinese Academy of Sciences; and Albert Galy and Christian France-Lanord of the Universit&eacute; de Lorraine &ndash; CNRS.<\/p>\n<p>The study was supported by U.S. National Science Foundation grants OCE-1401217 and OCE-1400805, and the International Ocean Discovery Program.<\/p>\n\n\n\n<\/div>\n\n\n  <\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Geology researchers at USC Dornsife find, for the first time, evidence that fresh wood can move from its home far inland to settle deep in the ocean, a discovery that appears to add to current models of Earth\u2019s carbon cycle. <strong>[3\u00be min read]<\/strong><\/p>\n","protected":false},"author":0,"featured_media":3197,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[9,10],"tags":[66,159,434],"class_list":["post-3194","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dornsife-global","category-faculty","tag-climate-change","tag-earth-sciences","tag-sarah-feakins"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Catastrophic events carry forests of trees thousands of miles to a burial at sea<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/dornsife.usc.edu\/news\/stories\/sediments-sequester-carbon-from-climate\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Catastrophic events carry forests of trees thousands of miles to a burial at sea\" \/>\n<meta property=\"og:description\" content=\"Geology researchers at USC Dornsife find, for the first time, evidence that fresh wood can move from its home far inland to settle deep in the ocean, a discovery that appears to add to current models of Earth\u2019s carbon cycle. 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