{"id":533692,"date":"2022-09-15T16:00:15","date_gmt":"2022-09-15T20:00:15","guid":{"rendered":"https:\/\/www.rochester.edu\/newscenter\/?p=533692"},"modified":"2022-09-15T16:00:15","modified_gmt":"2022-09-15T20:00:15","slug":"rochester-researchers-go-outside-the-box-to-delineate-major-ocean-currents-533692","status":"publish","type":"post","link":"https:\/\/www.rochester.edu\/newscenter\/rochester-researchers-go-outside-the-box-to-delineate-major-ocean-currents-533692\/","title":{"rendered":"Rochester researchers go \u2018outside the box\u2019 to delineate major ocean currents"},"content":{"rendered":"

Coarse graining technique enables them to \u2018gain more by settling for less.\u2019<\/h2>\n

For the first time Ä¢¹½´«Ã½<\/a> researchers have quantified the energy of ocean currents larger than 1,000 kilometers. In the process, they and their collaborators have discovered that the most energetic is the Antarctic Circumpolar Current, some 9,000 kilometers in diameter.<\/p>\n

The team, led by Hussein Aluie<\/a>, associate professor of mechanical engineering, used the same coarse-graining technique developed by his lab to previously document energy transfer at the other end of the scale, during the \u201ceddy-killing\u201d that occurs when wind interacts with temporary, circular currents of water less than 260 kilometers in size.<\/p>\n

These new results, reported in Nature Communications<\/a>, show how the coarse-graining technique can provide a new window for understanding oceanic circulation in all its multiscale complexity, says lead author Benjamin Storer, a research associate in Aluie\u2019s Turbulence and Complex Flow Group<\/a>. This gives researchers an opportunity to better understand how ocean currents function as a key moderator of the Earth\u2019s climate system.<\/p>\n

The team also includes researchers from the University of Rome Tor Vergata, University of Liverpool, and Princeton University.<\/p>\n

Traditionally, researchers interested in climate and oceanography have picked boxes in the ocean 500 to 1,000 square km in size. These box regions, which were assumed to represent the global ocean, were then analyzed using a technique called Fourier analysis, Aluie says.<\/p>\n

\u201cThe problem is, when you pick a box, you are already limiting yourself to analyzing what\u2019s in that box,\u201d Aluie says. \u201cYou miss everything at a larger scale.<\/p>\n

\u201cWhat we are saying is, we don\u2019t need a box; we can think outside the box.\u201d<\/p>\n

When the researchers use the coarse-graining technique to \u201cblur\u201d satellite images of global circulation patterns, for example, they find that \u201cwe gain more by settling for less,\u201d Aluie says. \u201cIt allows us to disentangle different-sized structures of ocean currents in a systematic way.\u201d<\/p>\n

He draws an analogy to removing your eyeglasses, then looking at a very crisp, detailed image. It will appear to be blurred. But as you look through a succession of increasing stronger eyeglasses, you will often be able to detect various patterns at each step that would otherwise be hidden in the details.<\/p>\n

In essence, that is what coarse graining allows the researchers to do: quantify various structures in ocean current and their energy \u201cfrom the smallest, finest scales to the largest,\u201d Aluie says.<\/p>\n

Aluie credits Storer for further developing and refining the code; it has been published so other researchers can use it.<\/p>\n

Other collaborators include Michele Buzzicotti, a research scientist at the University of Rome Tor Vergata; Hemant Khatri, a research associate at the University of Liverpool, and Stephen Griffies, a senior scientist at Princeton.<\/p>\n

Support for the project included funding from the National Science Foundation, the National Aeronautics and Space Administration, and the Department of Energy.<\/p>\n

\n

Read more<\/strong><\/h3>\n
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For the first time, University researchers have quantified the energy of ocean currents larger than 1,000 kilometers.<\/p>\n","protected":false},"author":286,"featured_media":533702,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[116],"tags":[23312,18632,31802,18572],"class_list":["post-533692","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sci-tech","tag-department-of-mechanical-engineering","tag-hajim-school-of-engineering-and-applied-sciences","tag-hussein-aluie","tag-research-finding"],"acf":[],"yoast_head":"\nRochester researchers go \u2018outside the box\u2019 to delineate major ocean currents<\/title>\n<meta name=\"description\" content=\"For the first time, University researchers have quantified the energy of ocean currents larger than 1,000 kilometers.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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