{"id":141070,"date":"2024-09-24T13:46:41","date_gmt":"2024-09-24T13:46:41","guid":{"rendered":"https:\/\/news.talkwithrattan.com\/index.php\/2024\/09\/24\/a-vital-ocean-current-is-stable-for-now\/"},"modified":"2024-09-24T13:46:42","modified_gmt":"2024-09-24T13:46:42","slug":"a-vital-ocean-current-is-stable-for-now","status":"publish","type":"post","link":"https:\/\/news.talkwithrattan.com\/index.php\/2024\/09\/24\/a-vital-ocean-current-is-stable-for-now\/","title":{"rendered":"A vital ocean current is stable, for now"},"content":{"rendered":"<div style=\"text-align:center\"><\/div> \r\n<br><div data-component=\"video-embed\">\n\t\t\t\t\n\n\n\n\n<p>The ocean\u2019s circulatory system may not be doing as poorly as previously thought.<\/p>\n\n\n\n<p>A vital ocean artery known as the Florida Current, a bellwether for the ocean\u2019s ability to regulate Earth\u2019s climate, has seemingly been weakening for decades. But that recent decline might not be quite as severe as suspected. The current has <a href=\"https:\/\/www.nature.com\/articles\/s41467-024-51879-5\" target=\"_blank\" rel=\"noopener\">actually remained stable over recent decades<\/a>, researchers report September 5 in <em>Nature Communications<\/em>.<\/p>\n\n\n\n<p>A previously reported decline in the flow had prompted speculations that a major system of ocean currents \u2014 known for regulating Earth\u2019s climate \u2014 <a href=\"https:\/\/bioone.org\/journals\/journal-of-coastal-research\/volume-38\/issue-6\/JCOASTRES-D-22A-00006.1\/Variability-and-Trends-of-the-Florida-Current-and-Implications-for\/10.2112\/JCOASTRES-D-22A-00006.1.short\" target=\"_blank\" rel=\"noopener\">may have weakened recently<\/a>\u00a0due to human-caused climate change. Some researchers have suggested that the larger system, known as the Atlantic Meridional Overturning Circulation, or AMOC, could <a href=\"https:\/\/www.nature.com\/articles\/s41467-023-39810-w\" target=\"_blank\" rel=\"noopener\">collapse sometime this century<\/a>, dramatically <a href=\"https:\/\/www.science.org\/doi\/10.1126\/sciadv.adk1189\" target=\"_blank\" rel=\"noopener\">cooling the northern hemisphere and raising the sea level<\/a> along some Atlantic coastlines by up to 70 centimeters.<\/p>\n\n\n<aside class=\"sn-conversion rich-text rich-text--with-sidebar\">\n<style><![CDATA[\n.email-conversion {\n  border: 1px solid #ffcccb;\n  color: white;\n  margin-top: 50px;\n  background-image: url(\"\/wp-content\/themes\/sciencenews\/client\/src\/images\/cta-module@2x.jpg\");\n  padding: 20px;\n  clear: both;\n}\n\n]]><\/style>\n\n\n\n                        <style class=\"is-layout-flow 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none;\n}\n\nform.zephr-form-content {\n    opacity: .9;\n}\n\nlabel.zephr-form-checkbox-label {\n    font-size: 1.2rem;\n    font-weight: bolder;\n}\n\n.zephr-form-custom-text > h4 {\n    color: black !important;\n}\n\nbutton.zephr-form-button {\n    background: #d4441f !important;\n    font-weight: bold !important;\n    text-transform: uppercase !important;\n}\n\nlabel.zephr-payment-form-checkbox-label {\n    color: white;\n    font-size: 1.6rem;\n}\n\n.zephr-form-content {\n    background:#2f537f;\n    \n}\n\n.zephr-payment-form-custom-text {\n    margin-top: .2rem;\n}\n\n.zephr-payment-form-checkbox-label {\n    display: flex;\n    align-items: center;\n    font-family: var(--zephr-typography-body-font), var(--zephr-typography-body-fallbackFont);\n    color: white;\n    font-weight: bold;\n}]]><\/style>\n                        \n                        \n<\/aside>\n\n\n<p>\u201cThe good news is that the AMOC is slowing down less than we thought, and that means that there\u2019s still time to avert a more serious slowdown,\u201d says oceanographer Hali Kilbourne of the University of Maryland Center for Environmental Science in Solomons, who was not involved in the new study.<\/p>\n\n\n\n<p>But because the reassessed data span only a few decades, she says, \u201cthere\u2019s still an outstanding question about whether or not the AMOC has slowed since preindustrial times,\u201d around the mid-1800s.<\/p>\n\n\n\n<p><a href=\"https:\/\/www.sciencenews.org\/article\/warming-could-disrupt-atlantic-ocean-current\" data-type=\"link\" data-id=\"https:\/\/www.sciencenews.org\/article\/warming-could-disrupt-atlantic-ocean-current\">The AMOC<\/a> acts like a two-level conveyor belt, circulating heat, salt and nutrients through the Atlantic Ocean (<em>SN: 1\/4\/17<\/em>). The belt\u2019s upper level carries warm, near-surface waters from the tropics to the North Atlantic. There, the water cools and sinks to the bottom of the ocean. It then returns south along the belt\u2019s lower level, eventually warming, rising and repeating the cycle.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><figcaption class=\"wp-element-caption\"><span class=\"caption wp-caption-3143738\">A global system of ocean currents transports heat, salts, nutrients and carbon dioxide through the world\u2019s seas, regulating Earth\u2019s climate and supporting the world\u2019s food web. The portion located in the Atlantic Ocean, known as the Atlantic Meridional Overturning Circulation, transports warm, near-surface waters (red) northward and returns cool, deep waters (blue) to the south. This process warms the northern hemisphere.<\/span><span class=\"credit wp-credit-3143738\">aristotoo\/DigitalVision Vectors\/Getty Images Plus<\/span><\/figcaption><\/figure>\n\n\n\n<p>In the subtropical North Atlantic, most of the water carried by the AMOC\u2019s upper level comes from the Florida Current, which whisks water from the Gulf of Mexico into the Gulf Stream. Since 1982, a seafloor telecommunications cable spanning the Florida Strait has been used to monitor the powerful current, providing the longest observational record of any AMOC component.<\/p>\n\n\n\n<p>Seawater contains charged atoms called ions, which flow across the cable and generate a measurable voltage. By calibrating voltage measurements with direct observations from periodic research cruise surveys, scientists can calculate how much water the current is carrying across the cable on any given day.<\/p>\n\n\n\n<p>But this process isn\u2019t perfect, says oceanographer Denis Volkov of the University of Miami. It\u2019s been managed by several generations of scientists, resulting in some data processing changes over the decades. Volkov\u2019s team found that after 2000, there was a failure to account for the shifting intensity and orientation of <a href=\"https:\/\/www.sciencenews.org\/article\/dont-flip-out-earths-magnetic-poles-arent-about-switch\">Earth\u2019s magnetic field<\/a> (<em>SN: 11\/23\/15<\/em>).<\/p>\n\n\n\n<p>After correcting for the geomagnetic shifts, the data indicate that in each decade since 2000, the Florida Current\u2019s flow rate declined by about 100,000 cubic meters per second. That\u2019s roughly a quarter of the previously reported decline, and virtually insignificant considering that the current averages about 32 million cubic meters per second.<\/p>\n\n\n\n<p>The correction also shrank estimates of a recent decline of the AMOC by about 40 percent. Each decade since 2000, the flow rate of the AMOC decreased by about 800,000 cubic meters per second, while it moves on average some 17 million cubic meters each second. While that\u2019s still a decline, it\u2019s barely significant, Volkov says, adding that it\u2019s not yet possible to say whether the decline is a consequence of climate change or a natural fluctuation.<\/p>\n\n\n\n<p>The takeaway is that the Florida Current\u2019s recent behavior does not indicate that the AMOC is slowing down because of climate change. Or the observational record is too short to detect such a decline.<\/p>\n\n\n\n\n\n<p>\u00a0\u201cThis is a great example of how with any scientific enterprise, we\u2019re always having to revise our data, our assumptions and our current dogma as new information comes to light,\u201d Kilbourne says.\u00a0<\/p>\n\n\n\n<p>But much of the work <a href=\"https:\/\/www.nature.com\/articles\/nclimate2554\" target=\"_blank\" rel=\"noopener\">indicating an AMOC decline<\/a> since preindustrial times uses paleoclimate proxy data, including deep-sea sediment grain sizes and coral compositions, which extend over thousands of years. The revised dataset is still too short to alter our understanding of the AMOC\u2019s long-term evolution, Kilbourne says.<\/p>\n\n\n\n<p>It\u2019s important to continue making these observations, because they may eventually help show how climate change is affecting the AMOC, says oceanographer Sophia Hines of the Woods Hole Oceanographic Institute in Falmouth, Mass. \u201cIt\u2019s all important, just different pieces of the puzzle.\u201d<\/p>\n\n\n\n\t\t\t<\/div>\r\n<br>\r\n<br><a href=\"https:\/\/www.sciencenews.org\/article\/vital-ocean-florida-current-stable\">Source link <\/a>","protected":false},"excerpt":{"rendered":"<p>The ocean\u2019s circulatory system may not be doing as poorly as previously thought. A vital ocean artery known as the Florida Current, a bellwether for the ocean\u2019s ability to regulate Earth\u2019s climate, has seemingly been weakening for decades. But that recent decline might not be quite as severe as suspected. The current has actually remained [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":141071,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"tdm_status":"","tdm_grid_status":"","fifu_image_url":"https:\/\/i0.wp.com\/www.sciencenews.org\/wp-content\/uploads\/2024\/09\/091224_no_florida_current_inline.jpg?resize=1440%2C810&ssl=1","fifu_image_alt":"","footnotes":""},"categories":[606],"tags":[14811,4522,12538,14598],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/news.talkwithrattan.com\/index.php\/wp-json\/wp\/v2\/posts\/141070"}],"collection":[{"href":"https:\/\/news.talkwithrattan.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/news.talkwithrattan.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/news.talkwithrattan.com\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/news.talkwithrattan.com\/index.php\/wp-json\/wp\/v2\/comments?post=141070"}],"version-history":[{"count":1,"href":"https:\/\/news.talkwithrattan.com\/index.php\/wp-json\/wp\/v2\/posts\/141070\/revisions"}],"predecessor-version":[{"id":141072,"href":"https:\/\/news.talkwithrattan.com\/index.php\/wp-json\/wp\/v2\/posts\/141070\/revisions\/141072"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/news.talkwithrattan.com\/index.php\/wp-json\/wp\/v2\/media\/141071"}],"wp:attachment":[{"href":"https:\/\/news.talkwithrattan.com\/index.php\/wp-json\/wp\/v2\/media?parent=141070"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/news.talkwithrattan.com\/index.php\/wp-json\/wp\/v2\/categories?post=141070"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/news.talkwithrattan.com\/index.php\/wp-json\/wp\/v2\/tags?post=141070"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}