|
|
|
|
|
| Abbott, April N.; Haley, Brian A.; Tripati, Aradhna K.; Frank, Martin. |
| Global warming during the Paleocene Eocene Thermal Maximum (PETM) similar to 55 million years ago (Ma) coincided with a massive release of carbon to the ocean atmosphere system, as indicated by carbon isotopic data. Previous studies have argued for a role of changing ocean circulation, possibly as a trigger or response to climatic changes. We use neodymium (Nd) isotopic data to reconstruct short high-resolution records of deep -water circulation across the PETM. These records are derived by reductively leaching sediments from seven globally distributed sites to reconstruct past deep-ocean circulation across the PETM. The Nd data for the leachates are interpreted to be consistent with previous studies that have used fish teeth Nd isotopes and benthic... |
| Tipo: Text |
|
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00639/75106/75520.pdf |
| |
|
|
| Tripati, Aradhna K.; Sahany, Sandeep; Pittman, Dustin; Eagle, Robert A.; Neelin, J. David; Mitchell, Jonathan L.; Beaufort, Luc. |
| During the Last Glacial Maximum, tropical sea surface temperatures were 1 to 3 degrees C cooler than present(1-4), but the altitude of the snowlines of tropical glaciers(5,6) was lower than would be expected in light of these sea surface temperatures. Indeed, both glacial and twentieth-century snowlines seem to require lapse rates that are steeper than a moist adiabat(7,8). Here we use estimates of Last Glacial Maximum sea surface temperature in the Indo-Pacific warm pool based on the clumped isotope palaeotemperature proxy in planktonic foraminifera and coccoliths, along with radiative-convective calculations of vertical atmospheric thermal structure, to assess the controls on tropical glacier snowlines. Using extensive new data sets for the region, we... |
| Tipo: Text |
|
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00290/40169/39048.pdf |
| |
|
|
|
