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RealClimate: For various reasons I'm motivated to provide an update on my current thinking regarding the slowdown and tipping point of the Atlantic Meridional Overturning Circulation (AMOC). I attended a two-day AMOC session at the IUGG Conference the week before last, there's been interesting new papers, and in the light of that I have been changing

Ce rapport analyse les obstacles et leviers à la lumière de projets inspirants en matière d'adaptation des villes à l'élévation du niveau de la mer dans le Pacifique.

Elizabeth Kolbert on a record-breaking rise in global sea-surface temperatures, which suggests that scientists may not understand how fast the climate is changing.

Collapse in system of currents that helps regulate global climate would be at such speed that adaptation would be impossible

Scientists now have a better understanding of the risks ahead and a new early warning signal to watch for.

Rapid ocean warming and unusually hot winter days recorded as human-made global heating combines with El Niño

Anthropogenic emissions drive global-scale warming yet the temperature increase relative to pre-industrial levels is uncertain. Using 300 years of ocean mixed-layer temperature records preserved in sclerosponge carbonate skeletons, we demonstrate that industrial-era warming began in the mid-1860s, more than 80 years earlier than instrumental sea surface temperature records. The Sr/Ca palaeothermometer was calibrated against ‘modern’ (post-1963) highly correlated (R2 = 0.91) instrumental records of global sea surface temperatures, with the pre-industrial defined by nearly constant (<±0.1 °C) temperatures from 1700 to the early 1860s. Increasing ocean and land-air temperatures overlap until the late twentieth century, when the land began warming at nearly twice the rate of the surface oceans. Hotter land temperatures, together with the earlier onset of industrial-era warming, indicate that global warming was already 1.7 ± 0.1 °C above pre-industrial levels by 2020. Our result is 0.5 °C higher than IPCC estim

Daily Sea Surface Temperature

Record sea surface temperatures suggest the Earth is headed for ‘uncharted territory’ in terms of sea level rise, coastal flooding and extreme weather

The new study shows that every increment of sea level rise will cover more than twice as much land as older models predicted, and marks another advance in providing more accurate models of rising seas

An international team of scientists painstakingly gathered data from more than 50 years of seagoing scientific drilling missions to conduct a first-of-its-kind study of organic carbon that falls to the bottom of the ocean and gets drawn deep inside the planet.

The accelerating thaw of Antarctica might drive sea levels up by more than five metres by 2300 unless governments act quickly to cut greenhouse gas emissions, a UN report said on Wednesday.

La Niña is present.* Equatorial sea surface temperatures (SSTs) are below average across most of the Pacific Ocean. The tropical Pacific atmosphere is consistent with La Niña. La Niña is expected to continue into the winter, with equal chances of La Niña and ENSO-neutral during January-March 2023. In February-April 2023, there is a 71% chance of ENSO-neutral.*

In the past 50 years, the oceans have absorbed more than 90% of the excess heat caused by our carbon dioxide emissions, with one ocean absorbing the vast majority.

Shallow deposits of frozen methane beneath oceans may be more vulnerable to thawing than previously known.

Ce policy brief propose une série de recommandations et appelle au renforcement des connaissances en amont de l’implantation d’éoliennes en mer. Il prône une meilleure connaissance du fonctionnement des écosystèmes marins, des impacts cumulés des activités humaines existantes et des impacts sur le milieu marin du changement climatique, afin de guider la planification notamment dans le choix des zones d’implantation des éoliennes.

Restaurant menus across the West Coast of Canada will soon see an influx of squid and sardine dishes, while the popular sockeye salmon makes a slow exit. As it turns out, climate change may have something to do with this.

A new study describes a period of rapid global climate change in an ice-capped world much like the present—but 304 million years ago. Within about 300,000 years, atmospheric carbon dioxide levels doubled, oceans became anoxic, and biodiversity dropped on land and at sea.

Fresh water cycles from ocean to air to clouds to rivers and back to the oceans. This constant shuttling can give us the illusion of certainty. Fresh water will always come from the tap. Won’t it? Unfortunately, that’s not guaranteed. Climate change is shifting where the water cycle deposits water on land, with drier areas becoming drier still, and wet areas becoming even wetter.

Water vapor is Earth’s most abundant greenhouse gas. It’s responsible for about half of Earth’s greenhouse effect — the process that occurs when gases in Earth’s atmosphere trap the Sun’s heat. Greenhouse gases keep our planet livable. Without them, Earth’s surface temperature would be about 59 degrees Fahrenheit (33 degrees Celsius) colder. Water vapor is also a key part of Earth’s water cycle: the path that all water follows as it moves around Earth’s atmosphere, land, and ocean as liquid water, solid ice, and gaseous water vapor.

As the world starts to seriously entertain the possibility of commercially mining the deep sea for valuable metals, it’s worth taking a closer look at the claims used to justify its potentially long-lived impacts.

Door de opwarming van het oceaanwater moeten walvissen noodgedwongen naar gevaarlijke gebieden trekken om eten te vinden. Ook voor andere zeezoogdieren wordt het moeilijker overleven in de warmere oceanen.

A Pandora’s box of environmental disasters has been opened, threatening the ability of the natural world to recover and humanity to survive. From devastating fires and storms to the emergence of deadly new viruses, it’s hard to deny the terrifying reality of climate change.

Een gevolg van de opwarmende oceanen is dat er minder vis te vangen zal zijn. Warmer water zorgt namelijk voor kleinere en minder mobiele vissen, en bedreigt zo onze voedselzekerheid.

The Atlantic Meridional Overturning Circulation (AMOC), a major ocean current system transporting warm surface waters toward the northern Atlantic, has been suggested to exhibit two distinct modes of operation. A collapse from the currently attained strong to the weak mode would have severe impacts on the global climate system and further multi-stable Earth system components. Observations and recently suggested fingerprints of AMOC variability indicate a gradual weakening during the last decades, but estimates of the critical transition point remain uncertain.

The Atlantic Ocean's current system, an engine of the Northern Hemsiphere's climate, could be weakening to such an extent that it could soon bring big changes to the world's weather, a scientific study said on Thursday.

Climate scientists have detected warning signs of the collapse of the Gulf Stream, one of the planet’s main potential tipping points. The research found “an almost complete loss of stability over the last century” of the currents that researchers call the Atlantic Meridional Overturning Circulation (AMOC). The currents are already at their slowest point in at least 1,600 years, but the new analysis shows they may be nearing a shutdown.

The shocking collapse of a 12-storey building in the Miami area last week has raised questions as to the role played by the climate crisis, and whether the severe vulnerability of south Florida to the rising seas may lead to the destabilization of further buildings in the future.

Officials prepare to elevate streets despite financial shortfalls, amid recognition that not every home can be save. Long famed for its spectacular fishing, sprawling coral reefs and literary residents such as Ernest Hemingway, the Florida Keys is now acknowledging a previously unthinkable reality: it faces being overwhelmed by the rising seas and not every home can be saved.

Around the world, dozens of ingenious projects are trying to ‘trick’ the ocean into absorbing more CO2. But critics warn of unforeseen consequences

A new report, published on 14 March, 2021 in the Royal Swedish Academy of Sciences’ journal Ambio, points out that humanity is hurtling towards destruction unless we have the collective wisdom to change course quickly.

Sea ice land. 7 Tipping points are analysed here. Climate tipping points, elements of the Earth system in which small changes in global temperature can kick off reinforcing loops that ‘tip’ a system into a profoundly different state, accelerating heat waves, permafrost thaw, and coastal flooding — and, in some cases, fueling more warming.

La Chine a qualifié mardi "d'irresponsable" la décision du Japon de rejeter à la mer les eaux issues de la centrale nucléaire de Fukushima, accidentée en 2011.

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nucléaire civil Japon Fukushima sécurité nucléaire ampgn santé,focussanté,docsforclimat focusclimate healthforfuture rejet eau océan H2O Chine

Le gouvernement japonais a officialisé ce mardi sa décision de rejeter dans l’océan Pacifique plus d’un million de tonnes d’eau traitée mais toujours radioactive de la centrale nucléaire accidentée de Fukushima Daiichi. Une opération qui pourrait s’étaler sur plusieurs décennies, malgré l’opposition de pays voisins, des ONG environnementales et des pêcheurs locaux.

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Le 11 mars 2011, l’archipel est secoué par le plus important séisme enregistré, de magnitude 9 sur l’échelle de Richter. 51 minutes plus tard, un tsunami frappe les côtes causant plus de 18 000 morts et provoquant des dégâts considérables.

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The persistent march of a warming climate is seen across a multitude of continuous, incremental changes. CO2 levels in the atmosphere. Ocean heat content. Global sea level rise. Each creeps up year after year, fuelled by human-caused greenhouse gas emissions.

Toutes les eaux d'évacuation, d'origine domestique, industrielle ou hospitalière, sont pourtant traitées - du moins dans les pays développés - par des stations d'épuration. Mais ces installations, qui éliminent les pollutions azotées, carbonées ou phosphorées, n'ont dans leur cahier des charges aucune obligation concernant les résidus médicamenteux. Ceux-ci ne sont que "partiellement" détruits,