Current Atlantic Meridional Overturning Circulation weakest in last millennium

@article{Caesar2021CurrentAM,
  title={Current Atlantic Meridional Overturning Circulation weakest in last millennium},
  author={L. Caesar and G. D. McCarthy and David J. R. Thornalley and Niamh Cahill and Stefan Rahmstorf},
  journal={Nature Geoscience},
  year={2021},
  volume={14},
  pages={118 - 120}
}
The Atlantic Meridional Overturning Circulation (AMOC)—one of Earth’s major ocean circulation systems—redistributes heat on our planet and has a major impact on climate. Here, we compare a variety of published proxy records to reconstruct the evolution of the AMOC since about ad 400. A fairly consistent picture of the AMOC emerges: after a long and relatively stable period, there was an initial weakening starting in the nineteenth century, followed by a second, more rapid, decline in the mid… Expand

Figures and Tables from this paper

Regional Imprints of Changes in the Atlantic Meridional Overturning Circulation in the Eddy-rich Ocean Model VIKING20X
Abstract. A hierarchy of global 1/4° (ORCA025) and Atlantic Ocean 1/20° nested (VIKING20X) ocean/sea-ice models is described. It is shown that the eddy-rich configurations performed in hindcasts ofExpand
Sensitivity of the Atlantic meridional overturning circulation and climate to tropical Indian Ocean warming
A salient feature of anthropogenic climate change is the enhanced warming of the tropical Indian Ocean (TIO) relative to the tropics. Recent studies show that this warming can remotely modulate theExpand
Orbital- and millennial-scale Antarctic Circumpolar Current variability in Drake Passage over the past 140,000 years
TLDR
It is inferred that the ACC is closely linked to Southern Hemisphere millennial-scale climate oscillations, amplified through Antarctic sea ice extent changes, and modulated Pacific-Atlantic water exchange via the “cold water route” and potentially affected the Atlantic Meridional Overturning Circulation and marine carbon storage. Expand
Drivers of exceptional coastal warming in the northeastern United States
The northeastern United States (NEUS) and the adjacent Northwest Atlantic Shelf (NWS) have emerged as warming hotspots, but the connection between them remains unexplored. Here we use griddedExpand
Reorganization of Atlantic waters at sub-polar latitudes linked to deep water overflow in both glacial and interglacial climate states
Abrupt climate events are generally attributed as a characteristic of glacial (intermediate-tolarge cryosphere) climate states. While a large cryosphere may be a necessary boundary condition forExpand
Exceptional 20th Century Shifts in Deep-Sea Ecosystems Are Spatially Heterogeneous and Associated With Local Surface Ocean Variability
Traditionally, deep-sea ecosystems have been considered to be insulated from the effects of modern climate change, but with the recognition of the importance of food supply from the surface ocean andExpand
Holocene paleoceanography of the Northeast Greenland shelf
Abstract. The Northeast Greenland shelf is highly sensitive to climate and ocean variability because it is swept by the East Greenland Current, which, through the western Fram Strait, forms the mainExpand
An Overview of Ocean Climate Change Indicators: Sea Surface Temperature, Ocean Heat Content, Ocean pH, Dissolved Oxygen Concentration, Arctic Sea Ice Extent, Thickness and Volume, Sea Level and Strength of the AMOC (Atlantic Meridional Overturning Circulation)
  • C. García-Soto, Lijing Cheng, +9 authors John Patrick Abraham
  • Frontiers in Marine Science
  • 2021
Global ocean physical and chemical trends are reviewed and updated using seven key ocean climate change indicators: (i) Sea Surface Temperature, (ii) Ocean Heat Content, (iii) Ocean pH, (iv)Expand
Interacting tipping elements increase risk of climate domino effects under global warming
Abstract. There exists a range of subsystems in the climate system exhibiting threshold behaviour which could be triggered under global warming within this century resulting in severe consequencesExpand
Greenland’s thaw pushes the biodiversity crisis
TLDR
Impacts on biodiversity of global warming and melting of Greenland’s ice sheet on the distribution of 21,146 species of vascular plants and tetrapods across twelve megadiverse countries are assessed. Expand
...
1
2
3
...

References

SHOWING 1-10 OF 13 REFERENCES
Exceptional twentieth-century slowdown in Atlantic Ocean overturning circulation
Possible changes in Atlantic meridional overturning circulation (AMOC) provide a key source of uncertainty regarding future climate change. Maps of temperature trends over the twentieth century showExpand
Anomalously weak Labrador Sea convection and Atlantic overturning during the past 150 years
TLDR
Palaeoclimate reconstructions indicate that the transition occurred either as a predominantly abrupt shift towards the end of the LIA, or as a more gradual, continued decline over the past 150 years; this ambiguity probably arises from non-AMOC influences on the various proxies or from the different sensitivities of these proxies to individual components of the AMOC. Expand
Observed fingerprint of a weakening Atlantic Ocean overturning circulation
TLDR
A characteristic ‘fingerprint’ of sea-surface temperatures suggests that the Atlantic overturning circulation has slowed substantially since the mid-twentieth century, as predicted by climate models in response to increasing carbon dioxide emissions. Expand
The North Atlantic Ocean Is in a State of Reduced Overturning
The Atlantic Meridional Overturning Circulation (AMOC) is responsible for a variable and climatically important northward transport of heat. Using data from an array of instruments that span theExpand
Last century warming over the Canadian Atlantic shelves linked to weak Atlantic Meridional Overturning Circulation
The Atlantic meridional overturning circulation (AMOC) is a key component of the global climate system. Many models predict a weakening or even a collapse of the AMOC under future climate change. R...
A Review of the Role of the Atlantic Meridional Overturning Circulation in Atlantic Multidecadal Variability and Associated Climate Impacts
By synthesizing recent studies employing a wide range of approaches (modern observations, paleo reconstructions, and climate model simulations), this paper provides a comprehensive review of theExpand
Ocean circulation and climate during the past 120,000 years
TLDR
Evidence implicates ocean circulation in abrupt and dramatic climate shifts, such as sudden temperature changes in Greenland on the order of 5–10 °C and massive surges of icebergs into the North Atlantic Ocean. Expand
Proxy-based reconstructions of hemispheric and global surface temperature variations over the past two millennia
TLDR
The results extend previous conclusions that recent Northern Hemisphere surface temperature increases are likely anomalous in a long-term context to at least the past 1,700 years, but with additional strong caveats. Expand
Industrial-era decline in subarctic Atlantic productivity
TLDR
The results suggest that the decline in industrial-era productivity may be evidence of the predicted collapse of northern Atlantic planktonic stocks in response to a weakened Atlantic Meridional Overturning Circulation, and may result in further productivity declines across this globally relevant region. Expand
Multiple drivers of the North Atlantic warming hole
Despite global warming, a region in the North Atlantic ocean has been observed to cool, a phenomenon known as the warming hole. Its emergence has been linked to a slowdown of the Atlantic meridionalExpand
...
1
2
...