#weddellsea — Public Fediverse posts

Deep Boundary Current Mixing Driven By Flow-Topography Interactions
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https://doi.org/10.1175/JPO-D-26-0115.1 <-- shared paper
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https://www.bas.ac.uk/project/dynamics-of-the-orkney-passage-outflow/ <-- shared technical article, British Antarctic Survey
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H/T @sonya Legg
“This study stems from the Dynamics of Orkney Passage Overflow field program in the Southern Ocean in 2017, and explores the myriad different instabilities in a deep current and their dependence on flow speed and topography. Why does this matter? As changing winds impact the Southern Ocean, mixing at choke points such as the Orkney Passage can influence how those changes impact Antarctic Bottom Water properties (and resultant heat and carbon storage in the abyssal ocean). [The H/T] really enjoyed the close collaboration with observationalists on this study, leading to detailed connections between the modeling and observational data in the final product…”
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“The deep boundary currents that transport dense waters around much of the abyssal ocean are a key component of the meridional overturning circulation. The mixing processes in deep boundary currents enable the bottom waters to upwell and return toward the surface, closing the overturning loop. Here [they] perform a case study of mixing processes in a deep boundary current conveying Antarctic Bottom Water from the Weddell Sea to the Scotia Sea through the Orkney Passage, which was extensively surveyed in an observational campaign in 2017. [They] use high-resolution regional simulations to elucidate the flow-topography interaction processes generating turbulence within the deep boundary current, exploring the sensitivity of the turbulent processes to barotropic flow variations, as well as to the characteristics of small-scale topography.[They found] that a variety of processes extract energy from the deep boundary current: hydraulic control at the sill accelerates the current and leads to shear instability at the sill; the rotating hydraulic jump leads to lateral shear instability away from the slope; frictional downwelling at the sloping topography produces the conditions for submesoscale instabilities. Small-scale topographic features generate additional turbulence in their wake, associated with boundary layer separation. The intensity of these processes exhibits a marked sensitivity to that of the barotropic flow, thus connecting wind-forced barotropic flow changes to changes in mixing and dense water properties within deep boundary currents…”
#GIS #spatial #mapping #remotesensing #marine #ocean #OrkneyPassage #OrkneyPassageOverflow #SouthernOcean #deepcurrent #current #Antarctic #AntarcticBottomWater #model #modeling #observational #spatiotemporal #spatialanalysis #water #hydrography #abyssal #oceanmeridionaloverturningcirculation #AMOC #WeddellSea #ScotiaSea #flow #topography #barotropicflowvariations #hydraulic #dynamic #seafloor #OceanCirculation #ClimateScience #Oceanography #climatechange #OceanDynamics #foodcycle #MarineEcosystems #NutrientCycles #EcosystemDynamics

🚢 Antarctica just grew! 🪨 Scientists found a hidden island in the Weddell Sea that maps missed. Is our world changing faster than we see? 🧐

Read full details on this accidental find! 📖
https://www.karmactive.com/weddell-sea-uncharted-island-antarctica-polarstern-2026/

Follow @karmactive for more updates.

#Antarctica #ClimateChange #WeddellSea

🐧‘To make the #WeddellSea a protected marine area, we need to demonstrate that what the area has to offer is of great value to humans.’

On 15 December, Oceanographer Jacqueline Stefels and marine biologist Maria van Leeuwe (UG) boarded the icebreaker #Polarstern of
@awi for an expedition to Antarctica.❄️

Curious? Read more 👇
🔗 https://www.rug.nl/fse/news/climate-and-nature/what-the-smell-of-the-sea-does-to-the-clouds-above-antarctica

🧪 #SciComm #marinebiology #biology #oceanography #microbiology #environmental #research #scientistsOnMastodon @universityofgroningen

🐧‘To make the #WeddellSea a protected marine area, we need to demonstrate that what the area has to offer is of great value to humans.’ Jacqueline Stefels (@[email protected]) boarded the #Polarstern of @[email protected] for an expedition to Antarctica.❄️ Curious? Read more 👇 🔗 www.rug.nl/fse/news/cli... 🧪 #SciComm

𝗪𝗜𝗞𝗜𝗣𝗘𝗗𝗜𝗔 𝗣𝗜𝗖𝗧𝗨𝗥𝗘 𝗢𝗙 𝗧𝗛𝗘 𝗗𝗔𝗬

✧ Larsen Ice Shelf ✧

The Larsen Ice Shelf is a long ice shelf in the Weddell Sea, extending along the east coast of the Antarctic Peninsula. It is named after Norwegian explorer Carl Anton Larsen, who sailed along the ice front in 1893. Composed of a series of shelves along the coast, named with letters from A to G, since the mid-1990...

#LarsenIceShelf #WeddellSea #AntarcticPeninsula #Larsen #eastcoast #Wikipedia
https://en.wikipedia.org/wiki/Larsen_Ice_Shelf

World’s biggest #iceberg breaks up after 40 years: ‘Most don’t make it this far’
‘Megaberg’ known as #A23a has rapidly disintegrated in warmer waters and could disappear within weeks
A23a calved from #Antarctic shelf in 1986 but quickly grounded in #WeddellSea, remaining stuck for over 30 years. It finally escaped in 2020 and, like other giants before it, was carried along "iceberg alley" into the South #Atlantic #Ocean by the powerful Antarctic Circumpolar Current.
https://www.theguardian.com/environment/2025/sep/02/worlds-biggest-iceberg-crumbles-apart

Warm Seawater Encroaches On Major Antarctic Ice Shelf, Raising Sea Level Concerns
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https://phys.org/news/2025-01-seawater-encroaches-major-antarctic-ice.html <-- shared technical article
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https://doi.org/10.1029/2023JC020700 <-- shared paper
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#GIS #spatial #mapping #climatechange #Antarctic #Antarctica #icesheet #warmwater #oceancurrents #ocean #marine #iceshelves #WeddellSea #FilchnerRonneIceShelf #basal #melt #melting #rates #model #modeling #continentalshelf #spatiotemporal #observation #icecover #freshwater #global #sealevel #climatemodels #water #temperature #velocity #seawater #FilchnerTrough #spatialanalysis #oceandynamics

Explorer Shackleton’s lost ship as never seen before https://www.bbc.co.uk/news/articles/cd6qz387qjgo #Shackleton #ErnestShackleton #Endurance #EnduranceShip #Antarctic #Antarctica #3D #ship #shipwreck #WeddellSea #visualization #visualisation #3Dscan #Exploration #Explorers #ice #sea

British research ship crosses paths with world’s largest iceberg https://www.rcinet.ca/eye-on-the-arctic/2023/12/04/british-research-ship-crosses-paths-with-worlds-largest-iceberg/

“It is incredibly lucky that the #iceberg’s route out of the #WeddellSea sat directly across our planned path, and that we had the right team aboard to take advantage of this opportunity... The team took samples of ocean surface waters around the iceberg’s route to help determine what life could form around it and how the iceberg and others like it impact #carbon in the ocean”

#Antarctica #ResearchVessel

👀

#A23a: World's biggest #iceberg on the #move after #30years

The world's #biggest iceberg is on the move after more than 30 years being #stuck to the ocean floor.

The iceberg, called A23a, split from the #Antarctic coastline in 1986. But it swiftly grounded in the #WeddellSea, becoming, essentially, an #ice #island.

At almost #4,000sqkm (1,500 sq miles) in area, it's more than twice the size of Greater #London.

https://www.bbc.com/news/science-environment-67507558

Regional #Antarctic #SeaIce extent anomalies and trends.

The strongest anomaly is located in the #WeddellSea.

The overall linear trend is still positive.

Data and methods: https://tc.copernicus.org/articles/6/871/2012/tc-6-871-2012.html

That was somehow to be expected. Let's see how long this area stays free of ice. Very interesting season!

#Antarctic #WeddellSea #Polynya #MaudRise #Meermittwoch

By the way, there are plenty open positions at @awi to obtain a PhD. Deadline already mid August. One related to Antarctic sea ice: https://jobs.awi.de/Vacancies/1429/Description/2

Really interesting and as @TatianaIlyina says, rather worrying paper from my colleagues in @OceanIceEU on the slow down of #Antarctic bottom water in the #WeddellSea

We had a long discussion after yesterday's #DigitalTwinOcean workshop about what we're maybe missing in the deep ocean... https://mas.to/@TatianaIlyina/110532642869083398

RT @CopernicusEU: On 23 January, an iceberg 5 times the size of Malta calved in #Antarctica🇦🇶

#Copernicus #Sentinel1🇪🇺🛰️ captured #A81 on 16 May after it travelled around 400 km across the #WeddellSea

The iceberg is now only 1.3 km away from the Filchner-Ronne Ice Shelf https://t.co/rBLqlOL9Aq

🐦🔗: https://n.respublicae.eu/CopernicusEU/status/1658848765992742916

🔍#ProjectSpotlight
🌊In a 🆕 study from the southern #WeddellSea, @TiPACCs_EU researchers collaborate to reveal that dense water flowing down the slope can push warm water up, reaching the continental shelf 🌡️
Dive into the findings🧐https://www.tipaccs.eu/on-shelf-heat-transport-driven-by-dense-water-export/
#H2020 #EU #Climate

🐦🔗: https://n.respublicae.eu/cinea_eu/status/1656241077974605824