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Santos, Thiago Pereira dos; Lessa, Douglas Villela de Oliveira; Venancio, Igor Martins; Chiessi, Cristiano Mazur; Mulitza, Stefan; Kuhnert, Henning; Albuquerque, Ana Luiza Spadano (2017): Oxygen isotope composition of surface, thermocline and mid-depth western South Atlantic during Termination I and II. PANGAEA, https://doi.org/10.1594/PANGAEA.884584, Supplement to: Santos, TP et al. (2017): The impact of the AMOC resumption in the Western South Atlantic thermocline at the onset of the last interglacial. Geophysical Research Letters, 44(22), 11,547-1,554, https://doi.org/10.1002/2017GL074457

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Abstract:
After glacial terminations, large amounts of heat and salt were transferred from low to high latitudes, which is a crucial phenomenon for the reestablishment of the Atlantic Meridional Overturning Circulation (AMOC). However, how different glacial terminations evolved in the (sub)tropics is still poorly documented. Here we use foraminifera oxygen (d18O) and carbon (d13C) stable isotopes to show that the North Atlantic heat piracy, following the AMOC resumption at the early Last Interglacial, affected the thermocline d18O levels of the subtropical western South Atlantic. Because of the cooling imposed by this process, glacial d18O persisted in the thermocline for ~7 kyr after the onset of the Last Interglacial, dampening the effect of sea level rise usually imprinted on foraminifera d18O during terminations. Faunal composition and d13C also suggest the existence of a colder and thicker South Atlantic Central Water coeval with the AMOC recovery. This process apparently did not occur during the last deglaciation.
Coverage:
Latitude: -24.920000 * Longitude: -42.510000
Event(s):
GL1090 (GL-1090) * Latitude: -24.920000 * Longitude: -42.510000 * Elevation: -2225.0 m * Location: western South Atlantic * Comment: collected by the Petrobras oil company
Size:
5 datasets

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