| Title |
Abrupt reversal in ocean overturning during the Palaeocene/Eocene warm period
|
|---|---|
| Published in |
Nature, January 2006
|
| DOI | 10.1038/nature04386 |
| Pubmed ID | |
| Authors |
Flavia Nunes, Richard D. Norris |
| Abstract |
An exceptional analogue for the study of the causes and consequences of global warming occurs at the Palaeocene/Eocene Thermal Maximum, 55 million years ago. A rapid rise of global temperatures during this event accompanied turnovers in both marine and terrestrial biota, as well as significant changes in ocean chemistry and circulation. Here we present evidence for an abrupt shift in deep-ocean circulation using carbon isotope records from fourteen sites. These records indicate that deep-ocean circulation patterns changed from Southern Hemisphere overturning to Northern Hemisphere overturning at the start of the Palaeocene/Eocene Thermal Maximum. This shift in the location of deep-water formation persisted for at least 40,000 years, but eventually recovered to original circulation patterns. These results corroborate climate model inferences that a shift in deep-ocean circulation would deliver relatively warmer waters to the deep sea, thus producing further warming. Greenhouse conditions can thus initiate abrupt deep-ocean circulation changes in less than a few thousand years, but may have lasting effects; in this case taking 100,000 years to revert to background conditions. |
Mendeley readers
The data shown below were compiled from readership statistics for 300 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Germany | 4 | 1% |
| Canada | 4 | 1% |
| France | 3 | 1% |
| Belgium | 3 | 1% |
| South Africa | 2 | <1% |
| United States | 2 | <1% |
| United Kingdom | 2 | <1% |
| Brazil | 1 | <1% |
| Australia | 1 | <1% |
| Other | 3 | 1% |
| Unknown | 275 | 92% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Researcher | 68 | 23% |
| Student > Ph. D. Student | 55 | 18% |
| Student > Bachelor | 36 | 12% |
| Professor | 26 | 9% |
| Professor > Associate Professor | 24 | 8% |
| Other | 61 | 20% |
| Unknown | 30 | 10% |
| Readers by discipline | Count | As % |
|---|---|---|
| Earth and Planetary Sciences | 171 | 57% |
| Agricultural and Biological Sciences | 39 | 13% |
| Environmental Science | 18 | 6% |
| Physics and Astronomy | 7 | 2% |
| Social Sciences | 6 | 2% |
| Other | 22 | 7% |
| Unknown | 37 | 12% |
Attention Score in Context
This research output has an Altmetric Attention Score of 13. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 13 April 2023.
All research outputs
#2,386,483
of 23,567,572 outputs
Outputs from Nature
#44,186
of 92,666 outputs
Outputs of similar age
#7,468
of 157,120 outputs
Outputs of similar age from Nature
#142
of 450 outputs
Altmetric has tracked 23,567,572 research outputs across all sources so far. Compared to these this one has done well and is in the 89th percentile: it's in the top 25% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 92,666 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 100.5. This one has gotten more attention than average, scoring higher than 51% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 157,120 tracked outputs that were published within six weeks on either side of this one in any source. This one has done particularly well, scoring higher than 94% of its contemporaries.
We're also able to compare this research output to 450 others from the same source and published within six weeks on either side of this one. This one has gotten more attention than average, scoring higher than 66% of its contemporaries.