Global ocean heat content in the Last Interglacial
| Autor: | Jochen Schmitt, Hubertus Fischer, Thomas Kellerhals, Joseph R. McConnell, Edward J. Brook, S. Shackleton, Vasilii V. Petrenko, J. A. Menking, Bernhard Bereiter, Daniel Baggenstos, M. Häberli, T. K. Bauska, Jeffrey P. Severinghaus, M. Dyonisius, Rachael H. Rhodes |
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| Přispěvatelé: | Shackleton, S [0000-0001-5927-1954], Baggenstos, D [0000-0001-9756-6884], Bereiter, B [0000-0002-1500-8617], Bauska, TK [0000-0003-1901-0367], Rhodes, RH [0000-0001-7511-1969], Schmitt, J [0000-0003-4695-3029], Fischer, H [0000-0002-2787-4221], Apollo - University of Cambridge Repository |
| Rok vydání: | 2020 |
| Předmět: |
13 Climate Action
010504 meteorology & atmospheric sciences Atmospheric circulation sub-01 010502 geochemistry & geophysics 14 Life Below Water 01 natural sciences Climate Action Sea surface temperature Ice core 13. Climate action Climatology Interglacial Deglaciation General Earth and Planetary Sciences Meteorology & Atmospheric Sciences 14. Life underwater Ocean heat content Mean radiant temperature Life Below Water Geology Sea level 0105 earth and related environmental sciences |
| Zdroj: | Nature Geoscience, vol 13, iss 1 |
| ISSN: | 1752-0894 |
| Popis: | The Last Interglacial (129–116 thousand years ago (ka)) represents one of the warmest climate intervals of the past 800,000 years and the most recent time when sea level was metres higher than today. However, the timing and magnitude of the peak warmth varies between reconstructions, and the relative importance of individual sources that contribute to the elevated sea level (mass gain versus seawater expansion) during the Last Interglacial remains uncertain. Here we present the first mean ocean temperature record for this interval from noble gas measurements in ice cores and constrain the thermal expansion contribution to sea level. Mean ocean temperature reached its maximum value of 1.1 ± 0.3 °C warmer-than-modern values at the end of the penultimate deglaciation at 129 ka, which resulted in 0.7 ± 0.3 m of thermosteric sea-level rise relative to present level. However, this maximum in ocean heat content was a transient feature; mean ocean temperature decreased in the first several thousand years of the interglacial and achieved a stable, comparable-to-modern value by ~127 ka. The synchroneity of the peak in mean ocean temperature with proxy records of abrupt transitions in the oceanic and atmospheric circulation suggests that the mean ocean temperature maximum is related to the accumulation of heat in the ocean interior during the preceding period of reduced overturning circulation. Rapid oceanic and atmospheric circulation shifts led to a transient peak in the mean temperature of the ocean at the start of the Last Interglacial, according to noble gas isotope records from an Antarctic ice core. |
| Databáze: | OpenAIRE |
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