En août 2024, la baie de Breid a perdu sa banquise d’hiver sur 89 121 km², une ouverture inédite à cette saison. Six rivières atmosphériques et une remontée d’eau plus chaude l’expliquent, mesures à l’appui.

Áralöng reynsla af rekstri tölvukerfa fyrir stór ... TechSupport var stofnað árið 2016. Hjá okkur kemur breið þekking kemur saman og %

Jeden Winter verdoppelt sich die Größe der Antarktis durch Meereis. Doch in der Breid Bay klaffte offenes Wasser, wo es gefroren sein sollte.

An unprecedented winter open-ocean polynya developed in the Breid Bay on 4 August 2024, attaining a maximum extent of 89,121 km2 Six intense atmospheric rivers with anomalous poleward heat and mo...

Every winter, Antarctica roughly doubles in size as sea ice locks into place over the ocean. Typically, Breid Bay in East Antarctica is entirely covered in a frozen crust from July through August. But in August 2024, satellite images revealed a massive hole in the ice, formally known as a polynya, which is a region of open seawater surrounded by sea ice. It's something scientists have never seen before at that time of year. At its largest, the hole reached an area of 89,121 square kilometers, which is only slightly smaller than the entire landmass of Portugal. According to a research team from India led by earth scientist Jeebanjyoti Swain, the hole was the result of a series of extreme weather conditions, including a series of intense atmospheric rivers and marine heatwaves. Swain and team have published their findings in _Geophysical Research Letters._ (a) Polynya event captured by NASA Worldview satellite, (b) Bathymetry of the Breid Bay, (c) Daily sea‐ice concentration showing the evolution of the open‐ocean polynya. The magenta contour denotes the 30 percent sea ice concentration threshold, and the dashed black rectangle highlights the same polynya region (16–31°E, 65–68°S) shown in panel (b) and (c). (Swain et al., _Geophysical Research Letters,_ 2026) "A series of intense atmospheric rivers, commonly known as 'rivers in the sky,' transported large amounts of moisture from lower latitudes into the Antarctic region, accompanied by a persistent southward flow that drove sea‐ice poleward," the authors write. Six atmospheric rivers carrying warm moist air occurred from July 2024 through August. The scientists note these specific atmospheric rivers are among the strongest mid-winter moisture transport events on record. "Together, they produced enhanced downwelling long-wave radiation, atmospheric warming, warm snowfall, and positive heat flux into the ocean, which collectively suppressed sea‐ice growth," the authors explain. "At the same time, strong winds induced Ekman suction, bringing warmer subsurface water toward the surface and contributing to upper‐ocean warming, with sustained marine heatwaves further inhibiting sea‐ice freezing." Ekman suction is a phenomenon that occurs when large volumes of surface water are displaced by the friction of wind blowing across the ocean. In this case, the Ekman suction carried upper circumpolar deep water to the surface, which is relatively warmer and more turbulent than the surface water usually is at that time of year, slowing and preventing freezing. Swain and team predict we will be seeing more of these Antarctic polynyas in the future, as climate change strengthens atmospheric rivers, produces more frequent and persistent heat waves in both air and sea, and heats up the upper layers of the Southern Ocean. "The low sea‐ice conditions and polynya formation may become frequent in regions where sea‐ice has historically remained stable," the team writes. This year, Antarctica reached its third-lowest level of winter sea ice extent on record. All four of the lowest winter sea ice records have occurred within the past four years, with 2023 being the record minimum, and 2024 (the year the massive hole appeared at Breid Bay) in second. In June this year, a large area of the Bellingshausen Sea (on the west side of the Antarctic Peninsula) failed to freeze over, leaving an area of ocean roughly the size of France exposed, which would usually have been covered by sea ice. Sea ice comes and goes throughout the year, and it floats, so it's not directly involved in changes to sea level. But it creates a buffer around the ice shelves and glaciers that do have the potential to accelerate sea level rise. Without a wide skirt of sea ice through the winter, more of Antarctica's ice sheet will be exposed to the increasingly warm ocean water, which is what scientists are really concerned about. Sea ice is also very important to Antarctic ecosystems: food webs that feed much of the world's oceans hinge on the ice's regular return. There's clear evidence that these changes to our global climate are the result of human activities: primarily, burning fossil fuels. This also means we can change the trajectory of these concerning trends. The research has been published in _Geophysical Research Letters_. This article was fact-checked by Fiona MacDonald and edited by Fiona MacDonald. While we pride ourselves on our process, we are only human. If you spot a mistake, please let us know.

No inverno de 2024 no hemisfério Norte, um enorme buraco incomum de água aberta foi formado na cobertura de gelo marinho da Baía de Breid, na Antártida Oriental, local que normalmente fica coberto por gelo nessa época do ano. O fenômeno, conhecido como polínia, chegou a ocupar 89.121 quilômetros quadrados, área pouco menor que o território de Portugal. A formação, identificada a partir de imagens de satélite, chamou a atenção dos cientistas porque o aparecimento de uma abertura desse tamanho durante o inverno não havia sido observado anteriormente na região. Agora, em artigo publicado na revista Geophysical Research Letters, uma equipe de pesquisa da Índia liderada pelo cientista da Terra Jeebanjyoti Swain, relatou que o buraco foi resultado de uma série de condições climáticas extremas, incluindo uma série de intensos rios atmosféricos (RAs) e ondas de calor marinhas. Durante o período em que ele se formou, seis rios atmosféricos atingiram o local. Esses sistemas, conhecidos como “rios no céu”, transportaram grandes quantidades de umidade de latitudes mais baixas para a região antártica, acompanhadas por um fluxo persistente para o sul que impulsionou o gelo marinho em direção aos polos. "Os RAs, por meio de fluxos intensificados de calor e umidade, cobertura de nuvens espessas e precipitação de neve quente, com ondas de calor atmosféricas, reduziram o resfriamento de inverno e inibiram o crescimento do gelo marinho", escreveram os autores. Reportagem do Science Alert destaca que o fenômeno foi reforçado por ventos fortes que induziram a sucção de Ekman - ocorre quando grandes volumes de água superficial são deslocados pelo atrito do vento que sopra sobre o oceano -, trazendo água subsuperficial mais quente para a superfície e contribuindo para o aquecimento da camada superior do oceano, com ondas de calor marinhas sustentadas inibindo ainda mais o congelamento do gelo marinho. "Juntos, a passagem repetida de rios atmosféricos e o aumento do fornecimento de calor oceânico criaram condições favoráveis ​​para a formação de uma polínia sem precedentes", salientou Swain e equipe. Os pesquisadores ainda previram que haverá mais dessas polínias antárticas no futuro, à medida que as mudanças climáticas fortalecem os rios atmosféricos, produzem ondas de calor mais frequentes e persistentes tanto no ar quanto no mar e aquecem as camadas superiores do Oceano Antártico. "As condições de baixo nível de gelo marinho e a formação de polínias podem se tornar frequentes em regiões onde o gelo marinho historicamente permaneceu estável", apontaram os pesquisadores Mais Lidas

„Dan gean ik nei de Filipinen!” In antwurd dat ik nea ferwachte hie. Foar my stiet in man mei learen cowboyhoed, in grien breid fest mei dêrunder in blau oerhimd. Oan syn fuotten: In pear klompen. Hy komt út Berltsum. Leeftyd: mar leafst 88 jier âld.

Every winter, Antarctica roughly doubles in size as sea ice locks into place over the ocean. Typically, Breid Bay in East Antarctica is entirely covered in a frozen crust from July through August. But in August 2024, satellite images revealed a massive hole in the ice, formally known as a polynya, which is a region of open seawater surrounded by sea ice. It's something scientists have never seen before at that time of year. At its largest, the hole reached an area of 89,121 square kilometers, which is only slightly smaller than the entire landmass of Portugal. According to a research team from India led by earth scientist Jeebanjyoti Swain, the hole was the result of a series of extreme weather conditions, including a series of intense atmospheric rivers and marine heatwaves. Swain and team have published their findings in Geophysical Research Letters. "A series of intense atmospheric rivers, commonly known as 'rivers in the sky,' transported large amounts of moisture from lower latitudes into the Antarctic region, accompanied by a persistent southward flow that drove sea‐ice poleward," the authors write. Six atmospheric rivers carrying warm moist air occurred from July 2024 through August. The scientists note these specific atmospheric...

Foto's-app krijgt nieuwe AI-tools (Ruim op, breid uit en herkader), gedeelde albums, trefwoorden, diavoorstellingen en nog veel meer!

Farmers Defence Force-leider Mark van den Oever heeft zijn achterban opgeroepen bewijsmateriaal te verwijderen dat duidt op betrokkenheid bij het verbranden van hooibalen langs openbare wegen op Prins...

YouTube video by Black Country, New Road

Industry Minister Hanna Katrín Friðriksson will introduce a bill this autumn on farming macroalgae in the sea, mbl.is reported. She announced the plan in her opening speech at the Gold in Shallow Waters conference, held at the Breið innovation centre in Akranes on Thursday afternoon. Representati…

Milestone en Mattel hebben het post-launch contentplan voor Hot Wheels Infinite Rush onthuld. Hot Wheels Infinite Rush krijgt na launch een grote uitbreiding, premium DLC’s en meer dan een jaar aan content ontworpen om de racemogelijkheden en verzamelingen van spelers uit te breiden. Hoogtepunten Vehicle Pass – Breid je virtuele garage uit met 44 extra Hot Wheels™ die gedurende een jaar met content updates uitgebracht worden. De updates voegen onder andere iconische Hot Wheels Originals, geliefde voertuigen uit de Acceleracers™ en Highway 35 World Race series en legendarische automerken uit de echte wereld toe.

Zo breid je je smart home nog verder uit (tegen een spotprijs)