{"id":144626,"date":"2026-06-06T05:12:56","date_gmt":"2026-06-06T08:12:56","guid":{"rendered":"https:\/\/ubirataonline.com.br\/mysterious-cold-blob-in-the-atlantic-suggests-the-amoc-is-weakening\/"},"modified":"2026-06-06T05:12:57","modified_gmt":"2026-06-06T08:12:57","slug":"mysterious-cold-blob-in-the-atlantic-suggests-the-amoc-is-weakening","status":"publish","type":"post","link":"https:\/\/ubirataonline.com.br\/en\/mysterious-cold-blob-in-the-atlantic-suggests-the-amoc-is-weakening\/","title":{"rendered":"Mysterious \u2018cold blob\u2019 in the Atlantic suggests the AMOC is weakening"},"content":{"rendered":"

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The \u201ccold blob\u201d appears in a data visualisation showing average temperatures in 2015, relative to the 1951-80 average<\/p>\n

NASA Scientific Visualization Studio\/Goddard Space Flight Center<\/p>\n<\/div>\n<\/figcaption><\/figure>\n<\/p>\n

Over the past 150 years, Earth\u2019s entire surface has been warming, except for one patch of the north Atlantic. Located south-east of Greenland, this area has cooled by as much as 1\u00b0C and is known as the \u201cwarming hole\u201d or the \u201ccold blob\u201d.<\/p>\n

Scientists have been split over why this cold blob exists, but the latest evidence backs up the idea that it is caused by a weakening of the Atlantic Meridional Overturning Circulation<\/a> (AMOC), the system of currents that transports warmth from the tropics to Europe.<\/p>\n

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The AMOC carries warm, salty water from the Gulf of Mexico towards the north Atlantic, where it cools and sinks, flowing back south along the ocean floor. Scientists are concerned that the surge of freshwater from Greenland\u2019s melting ice is making this salty water less dense, so it sinks more slowly, weakening the circulation.<\/p>\n

Some research suggests the AMOC could cross a tipping point<\/a> within decades, locking in a future collapse that would freeze Europe and disrupt monsoon rains crucial for agriculture in Africa and Asia. But we only have 22 years of direct observation of AMOC strength, not enough to tease out a clear trend.<\/p>\n

Climate modelling<\/a> has suggested that a slowing AMOC is carrying less warm water to the north Atlantic, resulting in the cold blob. However, other modelling has placed most of the blame on the atmosphere.<\/p>\n

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In a 2022 study<\/a>, Chengfei He<\/a> at Northeastern University in Boston and his colleagues found that rapid warming of the Arctic has reduced the temperature difference between the pole and the tropics, shifting the jet stream northwards into the cold blob region. The arrival of these strong westerly winds has forced more evaporation and churned up the water, drawing heat out of the ocean.<\/p>\n

Greater evaporation has also led to more clouds, shading the cold blob<\/a> from the sun\u2019s warmth, another study suggested.<\/p>\n

Stefan Rahmstorf<\/a> at the Potsdam Institute for Climate Impact Research in Germany and his colleagues have now investigated the cold blob with climate reanalyses, which are based on direct weather observations from satellites, buoys and ships, rather than climate modelling.<\/p>\n

They found that heat loss from the ocean surface has decreased in the cold blob since 1955. In addition, the ocean has been cooling not just near the surface, but also 1000 metres down. That means that the AMOC is transporting less heat, not that winds are taking more heat away, they argue.<\/p>\n

Winds and clouds \u201conly explain a modest fraction of the warming hole\u201d, says Rahmstorf. \u201cEven if, in some modelling approaches, it seems possible that the cold blob is caused by the atmosphere, in fact, the data show it is caused by the ocean.\u201d<\/p>\n

The finding reveals that Atlantic Ocean circulation has already been changing for decades, he adds, raising concerns about a collapse not only of the AMOC, but also of the subpolar gyre, a massive swirl of currents around the cold blob. The subpolar gyre helps bring in salty surface water to feed the sinking of cold, dense water that drives the AMOC. If it shuts down<\/a>, it could reduce temperatures in the UK and nearby countries more rapidly than a full AMOC collapse.<\/p>\n

\u201cThe subpolar gyre passing this tipping point could already lead to serious climate impacts in western Europe as early as in the 2040s,\u201d says Rahmstorf.<\/p>\n

But the ocean surface heat flux hasn\u2019t been directly measured, so the study could only infer it through modelling. A 2021 study based on some of the same reanalyses as the Rahmstorf one found that stronger winds accounted for most<\/a> of the cold blob.<\/p>\n

\u201cIt\u2019s challenging to try to use reanalysis to infer the energy budget in the cold blob,\u201d says He.<\/p>\n

The new study is useful, \u201cbut it won\u2019t be the final word\u201d on what is causing the cold blob, says David Thornalley<\/a> at University College London.<\/p>\n

Because data is limited, alternative explanations for the cold blob still can\u2019t entirely be ruled out, according to Neil Fraser<\/a> at the Scottish Association for Marine Science. For example, a branch of the AMOC known as the Norwegian current may be strengthening, transporting more heat out of the cold blob area, he says.<\/p>\n

\u201cThe cold blob is consistent with a weakening AMOC,\u201d he says. \u201cBut it is not conclusive evidence.\u201d<\/p>\n

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Topics:<\/p>\n<\/section><\/div>\n

Source link <\/a>
\nSee more: https:\/\/theglobaltrack.com\/
\nhttps:\/\/corinthiames.com.br\/<\/p>","protected":false},"excerpt":{"rendered":"

The \u201ccold blob\u201d appears in a data visualisation showing average temperatures in 2015, relative to the 1951-80 average NASA Scientific Visualization Studio\/Goddard Space Flight Center Over the past 150 years, Earth\u2019s entire surface has been warming, except for one patch of the north Atlantic. Located south-east of Greenland, this area has cooled by as much […]<\/p>\n","protected":false},"author":1,"featured_media":144627,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"googlesitekit_rrm_CAow2JLhCw:productID":"","maa_idioma":"","maa_pais":"","footnotes":""},"categories":[2725],"tags":[40195,11658,40194,7755,15392,10306,25503],"class_list":["post-144626","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-europe","tag-amoc","tag-atlantic","tag-blob","tag-cold","tag-mysterious","tag-suggests","tag-weakening"],"blocksy_meta":[],"yoast_head":"\nMysterious \u2018cold blob\u2019 in the Atlantic suggests the AMOC is weakening - Ubirat\u00e3 Online Not\u00edcias - A realidade ao seu alcance!<\/title>\n<meta name=\"description\" content=\"A patch of ocean south-east of Greenland is the only place on Earth that is cooling, and it could be a sign that the warm water "conveyor belt" in the Atlantic is slowing down\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ubirataonline.com.br\/en\/mysterious-cold-blob-in-the-atlantic-suggests-the-amoc-is-weakening\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mysterious \u2018cold blob\u2019 in the Atlantic suggests the AMOC is weakening\" \/>\n<meta property=\"og:description\" content=\"A patch of ocean south-east of Greenland is the only place on Earth that is cooling, and it could be a sign that the warm water "conveyor belt" in the Atlantic is slowing down\" \/>\n<meta property=\"og:url\" content=\"https:\/\/ubirataonline.com.br\/en\/mysterious-cold-blob-in-the-atlantic-suggests-the-amoc-is-weakening\/\" \/>\n<meta property=\"og:site_name\" content=\"Ubirat\u00e3 Online Not\u00edcias - 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