{"id":375,"date":"2013-10-12T11:46:53","date_gmt":"2013-10-12T15:46:53","guid":{"rendered":"http:\/\/jhumag.dev.173.166.187.154.xip.io\/?p=375"},"modified":"2014-06-02T15:22:57","modified_gmt":"2014-06-02T19:22:57","slug":"sea-sentinels-signal-ocean-changes","status":"publish","type":"post","link":"https:\/\/engineering.jhu.edu\/magazine-archive\/2013\/10\/sea-sentinels-signal-ocean-changes\/","title":{"rendered":"Sea Sentinels Signal Ocean Changes"},"content":{"rendered":"<figure id=\"attachment_376\" class=\"wp-caption alignleft\" style=\"width: 310px\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-376\" src=\"http:\/\/dev.bcreativegroup.com\/jhuwse\/wp-content\/uploads\/2014\/05\/sea_butterfly-300x257.jpg\" alt=\"Sea Butterfly (L. helicina)\" width=\"300\" height=\"257\" srcset=\"https:\/\/engineering.jhu.edu\/magazine-archive\/wp-content\/uploads\/2014\/05\/sea_butterfly-300x257.jpg 300w, https:\/\/engineering.jhu.edu\/magazine-archive\/wp-content\/uploads\/2014\/05\/sea_butterfly.jpg 350w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><figcaption class=\"wp-caption-text\">Sea Butterfly (L. helicina)<\/figcaption><\/figure>\n<p>Ethereal and remarkably beautiful, sea butterflies\u00a0<em>(L. helicina)<\/em>\u00a0are curious\u00a0<span class=\"s1\">marine creatures that have evolved<\/span>to have a unique\u2014and somewhat bizarre\u2014approach to swimming.<\/p>\n<p class=\"p3\">They use wing-like lobes called parapodia to \u201cfly\u201d vertically through the water column to reach nutrient-rich waters, escape\u00a0<span class=\"s2\">predators, and find mates.\u00a0<\/span>Their snail-like shells create a weight imbalance that gives sea butterflies a distinctive \u201cwobble\u201d as they swim. They then throw a mucous web\u2014several times the size of their bodies\u2014that acts like a parachute, allowing them to float suspended until they release the web and sink freely back down.<\/p>\n<p class=\"p3\">It is this unique swimming behavior that first intrigued Rajat Mittal, a professor of mechanical\u00a0<span class=\"s2\">engineering at the Whiting\u00a0<\/span>School, who has long had an\u00a0<span class=\"s2\">interest in computational<\/span>fluid mechanics and bioinspired engineering. Mittal recently teamed up with oceanographer Jeannette Yen, director of the Center for Biologically Inspired Design at Georgia Tech, to study the kinematics of sea butterfly movement in connection with ocean acidification. The project\u00a0<span class=\"s2\">is supported by a three-year $245,000 grant from the\u00a0<\/span>National Science Foundation\u2019s Polar Programs.<\/p>\n<p class=\"p3\">Sea butterflies are minuscule creatures\u2014measuring 1 to 3 mm<span class=\"s2\">\u2014but they play an enormous\u00a0<\/span>role in polar ecology, serving as a food source for sea birds, marine\u00a0<span class=\"s2\">mammals, and commercially\u00a0<\/span>important fish including salmon.<\/p>\n<p class=\"p3\"><span class=\"s2\">They are also extremely\u00a0<\/span>vulnerable to ocean acidification\u2014the ongoing decrease in the pH of the Earth\u2019s oceans caused by the uptake of carbon dioxide from the atmosphere. Over the past century, the pH of the ocean has decreased from 8.2 to 8.1\u2014faster than it has in the last 300 million years.<\/p>\n<p class=\"p3\">As ocean pH falls, the sea butterfly\u2019s aragonite shell thins, changing its body-to-shell ratio,\u00a0<span class=\"s3\">which in turn impacts the creature\u2019s<\/span>\u00a0propulsion and swimming abilities\u2014an unfortunate effect that Mittal and Yen hope to investigate as an early-warning indicator of ocean acidification.<\/p>\n<p class=\"p3\"><span class=\"s2\">The two are developing a bioassay that uses high-speed, high-resolution videography and 3-D tomographic particle velocimetry to examine the\u00a0<\/span><span class=\"s3\">hydrodynamics and body trajectory<\/span>\u00a0<span class=\"s2\">of freely swimming sea butterflies. This is a novel\u00a0<\/span>approach to locomotive studies\u00a0<span class=\"s2\">of planktonic organisms; traditionally, data has been\u00a0<\/span>captured in just two dimensions using methods that tethered the organism within the field-of-view of the camera.<\/p>\n<p class=\"p3\">Mittal will use the data collected with the new, state-of-the-art tomography system to develop computational models to unravel the creature\u2019s unique propulsion mechanisms\u2014and to\u00a0<span class=\"s4\">help scientists quantify the ecological\u00a0<\/span>impact of ocean acidification.<\/p>\n<p class=\"p3\">In addition to the ecological questions, Mittal asks: \u201cWhat are\u00a0<span class=\"s5\">the advantages to the sea butterfly\u2019s<\/span>\u00a0<span class=\"s3\">solution to underwater locomotion?<\/span>\u00a0Are there design solutions that can be transferred to bioinspired underwater microrobots?\u201d<\/p>\n<p class=\"p3\">In April, Mittal and Yen will travel to the Antarctica Palmer Station on Anvers Island to collect the preliminary data that Mittal will use as a basis for his first computer models of sea butterflies swimming through the water.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ethereal and remarkably beautiful, sea butterflies\u00a0(L. helicina)\u00a0are curious\u00a0marine creatures that have evolvedto have a unique\u2014and somewhat bizarre\u2014approach to swimming. They use wing-like lobes called parapodia to \u201cfly\u201d vertically through the water column to reach nutrient-rich waters, escape\u00a0predators, and find mates.\u00a0Their snail-like shells create a weight imbalance that gives sea butterflies a distinctive \u201cwobble\u201d as they&#8230;<\/p>\n","protected":false},"author":4,"featured_media":579,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[31],"tags":[],"class_list":["post-375","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-big-ideas","issue-winter-2014"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Sea Sentinels Signal Ocean Changes - JHU Engineering Magazine<\/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:\/\/engineering.jhu.edu\/magazine-archive\/2013\/10\/sea-sentinels-signal-ocean-changes\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sea Sentinels Signal Ocean Changes - JHU Engineering Magazine\" \/>\n<meta property=\"og:description\" content=\"Ethereal and remarkably beautiful, sea butterflies\u00a0(L. helicina)\u00a0are curious\u00a0marine creatures that have evolvedto have a unique\u2014and somewhat bizarre\u2014approach to swimming. They use wing-like lobes called parapodia to \u201cfly\u201d vertically through the water column to reach nutrient-rich waters, escape\u00a0predators, and find mates.\u00a0Their snail-like shells create a weight imbalance that gives sea butterflies a distinctive \u201cwobble\u201d as they...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/engineering.jhu.edu\/magazine-archive\/2013\/10\/sea-sentinels-signal-ocean-changes\/\" \/>\n<meta property=\"og:site_name\" content=\"JHU Engineering Magazine\" \/>\n<meta property=\"article:published_time\" content=\"2013-10-12T15:46:53+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2014-06-02T19:22:57+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/engineering.jhu.edu\/magazine-archive\/wp-content\/uploads\/2013\/10\/sea-sentinels-signal-ocean-change_370x250.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"370\" \/>\n\t<meta property=\"og:image:height\" content=\"250\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Abby Lattes\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Abby Lattes\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"NewsArticle\",\"@id\":\"https:\\\/\\\/engineering.jhu.edu\\\/magazine-archive\\\/2013\\\/10\\\/sea-sentinels-signal-ocean-changes\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/engineering.jhu.edu\\\/magazine-archive\\\/2013\\\/10\\\/sea-sentinels-signal-ocean-changes\\\/\"},\"author\":{\"name\":\"Abby Lattes\",\"@id\":\"https:\\\/\\\/engineering.jhu.edu\\\/magazine-archive\\\/#\\\/schema\\\/person\\\/0244393be370fbc3ead8ec26062e9742\"},\"headline\":\"Sea Sentinels Signal Ocean Changes\",\"datePublished\":\"2013-10-12T15:46:53+00:00\",\"dateModified\":\"2014-06-02T19:22:57+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/engineering.jhu.edu\\\/magazine-archive\\\/2013\\\/10\\\/sea-sentinels-signal-ocean-changes\\\/\"},\"wordCount\":486,\"commentCount\":0,\"image\":{\"@id\":\"https:\\\/\\\/engineering.jhu.edu\\\/magazine-archive\\\/2013\\\/10\\\/sea-sentinels-signal-ocean-changes\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/engineering.jhu.edu\\\/magazine-archive\\\/wp-content\\\/uploads\\\/2013\\\/10\\\/sea-sentinels-signal-ocean-change_370x250.jpg\",\"articleSection\":[\"Big Ideas\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/engineering.jhu.edu\\\/magazine-archive\\\/2013\\\/10\\\/sea-sentinels-signal-ocean-changes\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/engineering.jhu.edu\\\/magazine-archive\\\/2013\\\/10\\\/sea-sentinels-signal-ocean-changes\\\/\",\"url\":\"https:\\\/\\\/engineering.jhu.edu\\\/magazine-archive\\\/2013\\\/10\\\/sea-sentinels-signal-ocean-changes\\\/\",\"name\":\"Sea Sentinels Signal Ocean Changes - 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