Antarctic Bottom Water is warming, freshening and shrinking as glacial melt and sea ice changes reduce dense water formation. This slowdown of deep ocean circulation is putting many Antarctic penguin species' habitats at risk. #WorldPenguinDay. @antarctic.bsky.social @csiropublishing.bsky.social#WorldPenguinDay

The #AMOC is likely weakening. Observations show a consistent decline along the Atlantic’s western boundary, although eastern regions partly offset this, meaning the overall slowdown may be smaller than it first appears. @miamirosenstiel.bsky.social

The call for abstracts is open for #IMCC8! We welcome global, interdisciplinary, and student-led contributions. Help shape the future of ocean conservation. 🔗 Submit your abstract: conbio.org/mini-sites/i... ⏰ Deadline: 15 May #OceanConservation #MarineScience #SCBMarine @scbmarine.bsky.social

This #EarthDay calls on the global community to unite in accelerating the transition to renewable energy. 🌊 The ocean holds vast, untapped potential. From waves to tides to currents, ocean renewable energy could play a powerful role in addressing #ClimateChange and building a sustainable future.

A new study in the Mediterranean reveals that #ClimateChange isn't a simple "move to the poles" story. Their survival strategies are surprising! Many are moving South & West, seeking areas where warming is slower, and cold-water species are diving deeper. More via @theconversation.com

2026 #ElNiño event forming in the Pacific could be one of the strongest on record, likely making 2026 or 2027 the hottest years in human history. For the ocean, this means: 📉 Ecosystem stress 🐟 Impacted fisheries 🌀 Extreme energy and weather chaos @cnn.com

Coral reefs are nearing extinction. 2026 must mark a turning point | Jason Momoa

🌡️ Ocean heat reached a record high in 2025, driven mainly by human activity. Heat is building across the global ocean, especially in upper layers, increasing risks such as #SeaLevelRise, stronger storms and ecosystem stress. https://www.nature.com/articles/s43017-026-00775-1

Fishing supports food and livelihoods but some practices can disrupt ocean carbon storage. 15% of the ocean faces potential conflict between fisheries and carbon sequestration, with 1/4 linked to #BottomTrawling and 3/4 to pelagic fisheries, largely in the High Seas. @soslavsk.bsky.social#BottomTrawling

Artificial reefs in the Persian/Arabian Gulf, initially developed like natural reefs, were hit and collapsed after repeated marine heatwaves from 2015. The study shows that ocean warming must be addressed before artificial reefs can provide refuge from climate stress.

#ElNiño events can shape Antarctic sea ice months after they fade. Persistent South Pacific warming keeps atmospheric circulation patterns active, strengthening winter sea ice contrasts between the Antarctic Peninsula and Amundsen Sea and improving understanding of Antarctic climate variability.

Sea ice loss will greatly increase light and warmth in Arctic seas this century. Conditions will increasingly favour boreal 🐟 like Atlantic cod and walleye pollock, while polar cod lose suitable habitat, driving major shifts in Arctic food webs. #ClimateChange

🌊 Scripps Oceanography researchers developed an #AI approach that can spot patterns in satellite thermal imagery of the sea to reveal ocean currents in unprecedented detail. Learn how this advancement increases insights into ocean surface temperatures. ⤵️

Only a tiny fraction of the deep sea has been explored, and existing data are heavily biased. @oceandiscleague.bsky.social proposes observing 10,000 locations worldwide to create a more balanced and representative understanding of deep-sea ecosystems.

Floating 𝘚𝘢𝘳𝘨𝘢𝘴𝘴𝘶𝘮 has nearly vanished from the north Sargasso Sea since 2015 as warming and changing ocean currents disrupt its supply. https://dnyuz.com/2025/12/04/shifting-climate-alters-pattern-of-atlantics-giant-seaweed-blobs/

Coral reefs support around 1/4 of marine species & vital services, yet more than half have already been lost and most remain at risk. The authors of this paper set out a roadmap for coral reef resilience, centred on finance, knowledge, regional political coordination, area-based protection & more.

A recent study shows that even at 2°C warming, climate impacts can be as severe as those expected at higher temperatures (3/4°C warming), highlighting the need to consider worst-case scenarios in climate planning. #ClimateChange https://phys.org/news/2026-03-extreme-global-climate-outcomes-2c.html

⚠️ Rapid deep-water warming in the Greenland Basin now supplies excess heat to the Eurasian Basin via the Fram Strait, driving accelerated deep Arctic warming beyond geothermal and local processes. https://www.science.org/doi/full/10.1126/sciadv.adx9452

By 2100, Arctic Ocean phytoplankton blooms are projected to start about a month earlier and last longer as sea ice retreats. These changes alter food availability for Arctic wildlife and communities. @colorado.edu https://www.nature.com/articles/s43247-025-02807-y

The #BBNJAgreement aims to protect biodiversity on the High Seas, but major data gaps and limited monitoring remain. New technologies, better data sharing and stronger global collaboration are needed to support effective conservation and management. @pml.ac.uk#BBNJAgreementhttps://go.nature.com/4lUgCIc

A study shows that sea ice underpins today’s strong, winter-focused #Arctic amplification. As the Arctic moves toward an ice-free state, this seasonal pattern fades and overall amplification weakens, revealing sea ice as a key component of the current amplification regime.

A century of change has caused major genetic erosion in two tropical fish species in the Coral Triangle 🇵🇭 By comparing historical and modern specimens, the study reveals steep declines that threaten resilience in one of the ocean’s most biodiverse regions. https://bit.ly/4uKTMGH

Deep Atlantic waters are warming unevenly: temperatures rise west of the Mid-Atlantic Ridge but stay constant or cool to the east. The ridge acts as a barrier, blocking the spread of Antarctic Bottom Water warming and reshaping the ocean’s deep heat balance. https://bit.ly/4t55sCJ

The High Seas is under growing pressure: warming, acidification, overexploitation. #BBNJPrepCom 3 must lay the groundwork for #BBNJCOP 1 to move quickly toward High Seas #MPAs and sustainable management of our ocean. @highseasalliance.bsky.social#BBNJPrepCom

Many coastal hazard studies underestimate #SeaLevelRise impacts because they use simplified sea-level assumptions. Correcting these methods shows that far more land and people could fall below sea level than previously estimated, highlighting the need to reassess coastal risk worldwide.

A study proposes a unified framework for science-based ocean indicators that bridge data & decision-making. Using 9️⃣ pilot examples, it defines criteria to ensure reliability, comparability, and policy relevance, paving the way for a global system to monitor ocean health. @mercatorocean.bsky.social

As large herbivorous marine mammals, manatees play a critical role in maintaining seagrass bed health, supporting the broader coastal ecosystem that fish, invertebrates, and other species depend on. 🦭 #ManateeAppreciationDay #MarineScience

Scientists have discovered a new #DeepSea species of a filter-feeding worm, 𝘗𝘩𝘰𝘳𝘰𝘯𝘰𝘱𝘴𝘪𝘴 𝘥𝘦𝘱𝘳𝘰𝘧𝘶𝘯𝘥𝘪𝘴 𝘴𝘱. 𝘯𝘰𝘷., in the Sea of Okhotsk at depths down to 1,551 m. A broader ecological change, possibly linked to pollution-driven habitat shifts, is overturning the taxonomy of these animals.

Satellite data from 1992-2025 show that most Antarctic glacier grounding lines remain stable, but major retreat is occurring in vulnerable regions. Warm ocean water reaching glaciers is driving ice loss, highlighting areas that could accelerate future #SeaLevelRise. #WorldMetereologicalDay

Decades of progress in protecting marine mammals are at risk as US lawmakers move to weaken the Marine Mammal Protection Act and Endangered Species Act. https://www.science.org/doi/10.1126/science.aec4817 #WorldWaterDay #InternationalDayOfTheSeal

Today, the world celebrates #WorldDayforGlaciers. Our cryosphere is melting at an unprecedented pace. The Decade of Action for Cryospheric Sciences (2025–2034) is a global effort to boost research and drive urgent action to protect Earth’s frozen areas.

🌿 #StPatricksDay ocean edition When you look under the ocean surface and see green, you are usually seeing the "machinery" of life: phytoplankton (The "Grass" of the Sea), marine macrophytes and dissolved organic matter. "Green" water is "productive" and nutrient-rich, supporting the food web.

🌊 The ocean’s layering is speeding surface warming, worsening low-oxygen zones and driving more marine extremes. Strong regional contrasts are visible: salinity freshening boosts stratification in the Arctic, weaker or even decreasing stratification in the Southern Ocean.

Coral microbiomes harbour thousands of previously unknown microbial species and an exceptional capacity to produce natural products. As reefs decline, this vast and largely untapped molecular diversity is at risk. @ethz.ch

Dr. Jyotika Virmani, Executive Director of the @schmidtocean.bsky.social explains why making ocean data available is so important and how philanthropic actors can enable scientists to collect and access the data we need. https://www.facebook.com/reel/1174500171332791

A @smithsonianmag.bsky.social led study found that during the 2014–2017 Global Coral Bleaching Event, over 50% of the world’s coral reefs suffered significant bleaching. The current 4th global bleaching event is proving to be even more extensive, affecting up to 84% of the world's reefs.

Long-term ocean warming steadily reduces fish biomass. Short-term warming and heatwaves create local winners and losers, boosting cold-edge populations (+176% biomass) but harming warm-edge ones (-41.6%). For every 0.1°C / decade increase in seabed temperature, biomass declined by 7.22% on average.

The @ec.europa.eu ’s 7th National Report on Biodiversity reports 16 out of 45 targets set under the #KMGBF are on track to be achieved, before CBD COP17 this October. Despite robust framework in place, faster implementation can ensure all 2030 targets are met.

Fish communities are shifting towards smaller, more generalist species, simplifying food webs worldwide. Even without species loss, these changes may weaken ecosystem stability in the Anthropocene. https://phys.org/news/2026-02-global-smaller-fish-shifting-food.html

Do economists and environmental scientists speak the same language when it comes to climate risk? They have different priorities and frameworks; their perspectives are not aligned. A broader, integrated approach could improve outcomes for climate, biodiversity, and human well-being.

The @ec.europa.eu is calling for applications for the High-Level European Ocean Board, a new expert group established under the #EUOceanPact. If you are an expert in areas related to the ocean, maritime economy, and marine or coastal policies, check out the criteria. ↩️

Modern Caribbean reefs are 60-70% shorter and simpler food webs than reefs 7,000 years ago! This loss of trophic diversity could make reefs more vulnerable to future environmental stress. https://scienmag.com/7000-years-of-transformation-how-humans-altered-caribbean-coral-reef-food-chains/

Scientists discovered that plumes below Greenland's ice sheet may have been caused by thermal convection, similar to a boiling pot of pasta. As the climate warms, scientists are racing to understand how exactly it will melt and how fast. https://bit.ly/4qXtb6i

🌿 Seagrasses are unsung heroes in ocean carbon storage, storing vast amounts of #BlueCarbon and providing a crucial habitat for marine life. Protecting these vital ecosystems is essential for both climate action and biodiversity. #WorldSeagrassDay

UNCLOS and the #BBNJ Agreement set the frame for Arctic protection, but leave key gaps. Without clearer guidance and cooperation, practice will stay uneven and trust between states will suffer. Authors call for stronger monitoring, shared science and regionally agreed rules.

Are you one of the 5,000 scientists now gathered in Glasgow for #OSM26? It's the perfect time to join other scientists calling for urgent protection of vulnerable deep-sea ecosystems from destructive fishing practices. Add your signature today! @deepseaconserve.bsky.social @savingoceans.bsky.social

Check out the last 100 years of January sea surface temperature departures in the new ERSSTv6 dataset (up through 2026). 🌊 Learn more about this upgrade in doi.org/10.1175/JCLI... and doi.org/10.1175/JCLI.... If the data latency is similar, I will be using this in replace of my v5 graphics.

Two extreme #ElNiño events (2015 and 2023) caused near-total coral mortality on Mexico’s Pacific coast. With sea-surface temperatures exceeding 32.6 °C, reefs shifted from coral to algae dominance, with coral mortality reaching ~87–95% by 2024. #MarineHeatwaves

🐋 Southern right whales are reproducing less often. Climate-driven changes in #Antarctic sea ice and food supply are linked to longer calving intervals, signalling emerging stress in #SouthernOcean ecosystems. https://www.nature.com/articles/s41598-026-36897-1

The #HighSeasTreaty sets out procedures for environmental impact assessments in the High Seas. However, the Agreement has major gaps that could hinder effective protection. Authors propose practical pathways to make the system work.