{"id":454053,"date":"2025-12-17T21:00:21","date_gmt":"2025-12-17T21:00:21","guid":{"rendered":"https:\/\/www.europesays.com\/us\/454053\/"},"modified":"2025-12-17T21:00:21","modified_gmt":"2025-12-17T21:00:21","slug":"a-hole-the-size-of-switzerland-opened-in-antarcticas-sea-ice-revealing-a-powerful-force-hidden-for-decades","status":"publish","type":"post","link":"https:\/\/www.europesays.com\/us\/454053\/","title":{"rendered":"A Hole the Size of Switzerland Opened in Antarctica’s Sea Ice, Revealing a Powerful Force Hidden for Decades"},"content":{"rendered":"

During the Antarctic winters of 2016 and 2017<\/strong>, satellites detected something extraordinary in the Weddell Sea<\/strong> \u2014 a vast, circular hole in the middle of the frozen ocean. Roughly the size of Switzerland<\/strong>, it appeared where the sea ice should have been thickest. Scientists hadn\u2019t seen anything like it in decades.<\/p>\n

This wasn\u2019t just another crack in the ice. The formation, known as a polynya<\/strong>, emerged hundreds of kilometers from open water and persisted for weeks, defying extreme polar temperatures. Researchers were stunned: what force could create and sustain an open wound in one of the planet\u2019s coldest regions?<\/p>\n

The last time a polynya of this scale formed near Maud Rise<\/strong>, an undersea mountain east of Antarctica, was in the 1970s. For years, that event remained a climatic riddle. <\/p>\n

\"LocationLocation of the Maud Rise seamount in the Weddell Sea and changes in Antarctic sea-ice concentration between 2013 and 2018. The red box marks the study area where the giant polynya appeared. (Image credit: Narayanan et al., Science Advances)<\/strong><\/strong><\/p>\n

Now, a new peer-reviewed study published in Science Advances<\/a> has finally provided a detailed explanation, revealing how a complex interaction between wind, ocean currents, and salinity<\/strong> tore a hole through the Antarctic ice pack.<\/p>\n

A Hidden Engine Beneath Antarctica\u2019s Ice<\/p>\n

The research team, led by Aditya Narayanan<\/strong> of the University of Gothenburg, found that the Maud Rise polynya was driven by a powerful process called Ekman-driven salt transport<\/strong>. Between 2015 and 2018, eastward surface winds strengthened over the region, pushing saltier water from the seamount\u2019s center toward its northern flank.<\/p>\n

This subtle but persistent movement of salt disrupted the ocean\u2019s vertical layering. The upper layer of water became denser and began to sink, drawing up warmer, saltier water from the deep ocean<\/a>. That upwelling heat melted the sea ice from below, preventing new ice from forming and maintaining an open patch of ocean in the dead of winter.<\/p>\n

The process created a feedback loop: open water released heat to the cold Antarctic atmosphere<\/a>, encouraging further mixing and sustaining the hole. Once started, it became a self-reinforcing system of ocean convection<\/strong>.<\/p>\n

\"ConceptualConceptual model showing how intensified winds and Ekman-driven salt export over the Maud Rise can destabilize the ocean surface, promoting deep convection and sea-ice melting. (Image credit: Narayanan et al., Science Advances)<\/strong><\/strong><\/strong><\/p>\n

The study used a detailed ocean model known as the Southern Ocean State Estimate (SOSE)<\/strong>, which merges satellite, buoy, and climate reanalysis data to reconstruct the event. The simulations showed how local frictional forces, deep-water salinity, and regional circulation all converged to weaken stratification \u2014 the layering that normally keeps warm, deep water sealed beneath the ice.<\/p>\n

When Wind and Salt Reshape the Southern Ocean<\/p>\n

From 2013 onward, the Weddell Gyre<\/strong>, a vast rotating current that circles the southern Atlantic sector of the Southern Ocean, began to intensify. That shift injected more warm deep water<\/strong> and salt<\/strong> toward Maud Rise, setting the stage for destabilization.<\/p>\n

\"ProgressiveProgressive changes in upper-ocean salinity and density around the Maud Rise from 2013 to 2018. The darker hues show increasing salinity and decreasing stratification, conditions that culminated in the 2017 Maud Rise polynya. (Image credit: Narayanan et al., Science Advances)<\/strong><\/strong><\/strong><\/p>\n

By 2016, persistent cyclonic winds over the region enhanced surface stress on the ocean. The wind-driven Ekman transport carried saline water across the Maud Rise\u2019s flanks, gradually eroding the upper layer\u2019s stability. The result was a rare alignment of oceanic and atmospheric forces strong enough to open the sea ice.<\/p>\n

The polynya first appeared late in the winter of 2016, then expanded dramatically in 2017 to an area of about 80,000 square kilometers<\/strong>. Satellite observations showed the water column mixing from the surface down several hundred meters \u2014 a clear sign of deep convection. The hole finally closed in early 2018 as wind and temperature patterns shifted, but the ocean beneath remained altered for months.<\/p>\n

Researchers documented a measurable loss of ocean heat content<\/strong>, confirming that the event had ventilated warm, carbon-rich waters from the depths into the atmosphere. The study demonstrated that even highly localized wind changes can trigger global-scale consequences by influencing how the ocean exchanges heat and carbon dioxide with the air.<\/p>\n

What the Maud Rise Polynya Reveals About a Changing Climate<\/p>\n

Open-ocean polynyas like Maud Rise play a crucial role in regulating the Earth\u2019s heat balance<\/strong> and the formation of Antarctic Bottom Water<\/strong>, one of the key drivers of global ocean circulation. When they form, they expose deep waters to the atmosphere, releasing stored carbon<\/strong> and heat<\/strong> while altering sea-ice formation and local ecosystems.<\/p>\n

The study\u2019s authors note that such events used to be more common in the pre-industrial era<\/strong>, but are now rare due to the strengthening of vertical ocean stratification\u2014a result of fresher surface waters and stronger westerly winds driven by human-induced climate change. Their findings suggest that if wind patterns continue to shift or sea-ice cover weakens, similar open-ocean convection could recur more frequently.<\/p>\n

The Southern Ocean<\/strong> is already absorbing vast amounts of excess heat and carbon, buffering the planet against rapid warming. But events like the Maud Rise polynya show that this system is not stable. A small perturbation in wind or salinity can reconfigure how the ocean breathes\u2014potentially altering weather, sea-level rise, and carbon cycling far beyond Antarctica.<\/p>\n","protected":false},"excerpt":{"rendered":"During the Antarctic winters of 2016 and 2017, satellites detected something extraordinary in the Weddell Sea \u2014 a…\n","protected":false},"author":3,"featured_media":454054,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[746,159,67,132,68],"class_list":{"0":"post-454053","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-environment","8":"tag-environment","9":"tag-science","10":"tag-united-states","11":"tag-unitedstates","12":"tag-us"},"share_on_mastodon":{"url":"https:\/\/pubeurope.com\/@us\/115736924828000785","error":""},"_links":{"self":[{"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/posts\/454053","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/comments?post=454053"}],"version-history":[{"count":0,"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/posts\/454053\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/media\/454054"}],"wp:attachment":[{"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/media?parent=454053"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/categories?post=454053"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/tags?post=454053"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}