#seaice — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #seaice, aggregated by home.social.
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17 min ago @ 2250 4th Ave S, Seattle, WA 98134, USA
https://iceout.org/en/reportInfo/145609
#SeaICE #SeattleICE #ICE #Seattle -
17 min ago @ 2250 4th Ave S, Seattle, WA 98134, USA
https://iceout.org/en/reportInfo/145609
#SeaICE #SeattleICE #ICE #Seattle -
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Sea salt may have made Snowball Earth far colder than previously thought
Salt crystals left behind on extremely cold tropical sea ice may …
#NewsBeep #News #Science #albedofeedback #ancientEarth #AU #Australia #Climatechange #climatemodeling #Cryogenian #globalglaciation #GreenGoodNews #hydrohalite #Marinoanglaciation #Neoproterozoic #NewDiscoveries #PlanetaryScience #research #saltalbedo #seaice #seasalt #SnowballEarth #Sturtianglaciation #UniversityofTromsø
https://www.newsbeep.com/au/882608/ -
#SeaIce loss in the #Arctic has triggered a critical #TippingPoint that's destroying the food chain
Story by Sascha Pare, June 8, 2026
"The Arctic Ocean has crossed a tipping point that is wreaking havoc on the region's food chain, with potentially dire consequences for commercial fishing and the ocean's capacity to soak up carbon, a new study reports.
"Scientists found that vast areas of melting sea ice in the Arctic are leading to a significant reduction in nitrate, a key nutrient that forms the base of the marine food web and thus underpins important regional fisheries. As the ice disappears, more light hits the water's surface, promoting the growth of microscopic, plant-like organisms called phytoplankton. When phytoplankton die, their cells sink to the seafloor and are decomposed by nitrate- and oxygen-consuming bacteria.
"The new study, published May 28 in the journal Communications Earth & Environment, found that the bacteria are consuming more nitrate than the Arctic ecosystem can withstand.
"This effect, known as 'denitrification,"' is irreversible under current climate conditions because we have passed a threshold where so much sunlight reaches the ocean that it's supercharging phytoplankton's productivity, said Marta Santos-García, a doctoral student of Arctic marine biogeochemistry at the University of Edinburgh in Scotland and the first author of the study.
" 'Even if sea ice were to increase temporarily, the Arctic nutrient system responds over much longer timescales,' Santos-García told Live Science in an email. 'Short-term increases in sea ice would be unlikely to rapidly reverse the decline in nitrate inventories, which may take much longer to recover.'
"Dropping nitrate levels may eventually come back to bite phytoplankton, because these tiny organisms need nitrate to carry out photosynthesis. As a result, the transition to a low-nitrate regime could accelerate #ClimateChange, as nitrate plays an essential role in the ocean's biological pump, which takes #CarbonDioxide from the atmosphere via photosynthesis and locks it away at depth when #phytoplankton and the animals that eat it die.
" 'With nutrients such as nitrate in limited supply this mechanism cannot work effectively,' Santos-García said.
"To understand ecosystem changes in the Arctic, the researchers analyzed two decades of data from the Fram Strait, a passage between Greenland and Svalbard, Norway, that is the main gateway through which Arctic waters flow into the Atlantic Ocean. They found a sharp decline in nitrate levels in this region after 2009, which coincided with a dramatic reduction in Arctic sea ice and a gradual shift in phytoplankton communities toward smaller species that can cope with low nutrient levels.
" 'Shifts towards smaller phytoplankton have already been observed in parts of the Arctic, although these changes have not previously been linked to nitrate losses,' Santos-García said. 'This matters because smaller phytoplankton are generally less efficient at transferring energy up the food web. More of the energy is recycled within microbial communities rather than being passed on to larger zooplankton, fish, seabirds, and marine mammals.'
"Phytoplankton sit at the very bottom of the marine food chain, so the impacts of nitrate depletion will ripple through the Arctic ecosystem, impacting species at the highest levels. This could also affect fisheries in regions that depend on Arctic nutrient exports, such as the North Atlantic. But pinpointing what will happen in ecosystems downstream of the Arctic Ocean requires more research, Santos-García said.
"For years, researchers thought the long-term impact of sea ice loss in the Arctic would be an increase in phytoplankton, because more organisms can bathe in sunlight and multiply when the sea ice extent is small. However, the increase in phytoplankton since 2009 has depleted nitrate levels enough to limit future phytoplankton growth.
"Whereas phytoplankton proliferation used to be limited by how much sunlight reached surface waters, it is now controlled by nitrate levels. Therefore, nitrate must be considered as a key driver of future changes in the Arctic, Santos-García said.
" 'As nitrate is the nutrient that limits Arctic productivity, understanding these changes is therefore important not only for Arctic communities and ecosystems, but also for improving projections of future climate change,' she said."
Archived version:
https://archive.ph/E1Dlw#ClimateChange #TippingPoint #GlobalWarming #WarmingOceans #ArcticEcosystems #SeaIce #OceansAreLife
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Out for a drive. #mountains #jaegars #ptarmigan #nomealaska #seaice
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“Frozen Waves”
Photographer Jan Erik Waider is a master of capturing incredible landscape imagery. In these videos, he uses a drone to film waves in the Baltic Sea gently undulating polygonal slabs of ice on the ocean surface. The interplay of light, color, and motion looks almost surreal, but nature is better than we credit at making imagery too good to look away from. (Video and image credit: J. Waider/NorthLandscapes; via Colossal)
https://www.youtube.com/watch?v=-JQaZaUSS0E
#flowVisualization #fluidDynamics #fluidsAsArt #freezing #ice #oceanWaves #physics #science #seaIce -
The Arctic Just Experienced Its Warmest Year on Record
The past 10 years have been the warmest recorded in a region that is heating at two to four times the global average.https://murica.website/2025/12/the-arctic-just-experienced-its-warmest-year-on-record/
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Amid yesterday's #ExtremeWeather 💨, @bernardchickey.bsky.social was blown away by #NZmedia's reticence to use the C-word:
https://www.youtube.com/watch?v=PJ2OmZprpKoIf the driver of these hot & windy conditions is unusual Sudden Stratospheric Warming over Antarctica:
https://www.rnz.co.nz/news/national/576739/antarctica-s-september-weather-driving-current-hot-windy-conditions
then #SeaIce loss over the Amundsen & Ross Seas may provide the link to #ClimateChange:
https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2025GL115257 -
Still haven't gotten around comprehending how to convert a lat-lon grid with ice thickness to a correct regional sum of freshwater amount in Gt.
But something else keeps popping up in my head now.
Peltier's ice model / reconstruction (dunno which it is) doesn't include sea ice at all https://www.atmosp.physics.utoronto.ca/~peltier/data.php
Tarasov's GLAC1D model does. https://doi.org/10.5281/zenodo.10159104
At least the melted parts of sea ice is included. But not the ever-lasting part.That ever-lasting part is melting today, and has been melting for a long while now. But it didn't melt during past AMOC hickups. What melted back then was ice that covered Scotland with a whopping 400m ice wall. And higher ice mountains still melted in other regions. But not sea ice in the Arctic ocean.
...hm. What I really want to know is how the amount of freshwater influx back then
compares to the amount today, and how today's very little left-over ice would be capable of stopping AMOC.We'll be having a blue Arctic ocean before 2030, says a new study https://www.ft.com/content/63fbcf2b-9acc-4ccb-ac12-9f3b78e85b68
https://www.nature.com/articles/s41467-024-54508-3 #Heuze and #Jahn 2024, "The first ice-free day in the Arctic Ocean could occur before 2030" #openaccess 💃
Wouldn't it be cool to know by then how much ice in kilos or Gt melted ? And how that amount compares to the amount before previous AMOC shutdowns during the LGM and deglaciasation?
#paleoclimate #sealevelrise #GlacierMelt #AMOC #seaice #Arctic
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Who knows what the meltrate was in Gt, the Atlantic freshwater input per year (or 100yrs) in paleoclimate, before an AMOC stop or strong slowdown?
Glacier and sea ice from East Canada and West Greenland, and on the other AMOC limb, NE-Greenland with Scandinavia and the British isles.
I would like to be able to compare today's melt rate to past incidents of ice melt and AMOC slowdown / stop.
And to be able to plot data along other proxy time series to get a feel for things.Today's data is given in Gt. So that's what I'd be after in paleoclimate data. Sverdrup is not so useful to me.
Today's Greenland melt can be 444 Gt yr in 2019 as per https://essd.copernicus.org/articles/15/1597/2023/ by #Otosaka etal 2024
and on average 270 Gt/year as per State of the Cryosphere Report https://iccinet.org/statecryo24/ , based on #Greene etal 2024.Thank you for sharing my question🙏! And for pointers!
#AMOC #paleoclimate #seaice #glacier #GlacierMelt #Atlantic
#FollowerPower -
New paper in #TheCryosphere
Congratulations Marion Bocquet and colleagues!
Arctic sea ice radar freeboard retrieval from the European Remote-Sensing Satellite (ERS-2) using altimetry: toward sea ice thickness observation from 1995 to 2021
#Arctic #SeaIce #RemoteSensing #Climate
As is so often the case, it is worth taking a look at the peer review discussion. #OpenAccess #OpenScience
