EGU21-10772, updated on 04 Mar 2021
https://doi.org/10.5194/egusphere-egu21-10772
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Northern Spain temperature constrained by fluid inclusion water isotopes in speleothems during the abrupt oscillations of the last deglaciation period

Juan Luis Bernal Wormull1, Ana Moreno Caballud1, Yuri Dubliansky2, Christoph Spötl2, Carlos Pérez-Mejías3, Miguel Bartolomé4, Eneko Iriarte5, Martin Arriolabengoa6, Arantza Aranburu6, Isabel Cacho7, Hai Cheng3,8, and R. Lawrence Edwards9
Juan Luis Bernal Wormull et al.
  • 1Pyrenean Institute of Ecology - CSIC, Zaragoza, Spain
  • 2Institute of Geology, University of Innsbruck, Innsbruck, Austria
  • 3Institute of Global Enviromental Change, Xi’an Jiaotong University, Xi’an, China
  • 4National Museum of Natural Sciences - CSIC, Madrid, Spain
  • 5University of Burgos, Burgos, Spain
  • 6University of the Basque Country, Leioa, Spain
  • 7GRC Geociències Marines, Universitat de Barcelona, Barcelona, Spain
  • 8Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, China
  • 9University of Minnesota, Minneapolis, MN, USA

The last deglaciation (from ≈19 kyr BP to the onset of the Holocene) is a time interval characterized by major and abrupt climate changes mostly caused by the Atlantic Meridional Overturning Circulation (AMOC) which is responsible for redistributing heat on a planetary scale, including the Iberian Peninsula. This study is focused in the Western Pyrenees, northern Spain, a southern European region key to understand Northern Hemisphere climate teleconnections associated to several warming and cooling events that took place abruptly. It is especially important to know when precisely these events occurred and what their amplitude was to better understand their causes and impacts on the regional environment.

The climatic events mentioned above are recorded in lake and marine sediments in the central and southern Europe denoting the importance of these records in the transitional zone between the Atlantic and the Mediterranean climatic realms. The glacial-interglacial transition was also identified in isotopic values of speleothems at this latitude, where differences and similarities with the patterns identified in the Greenland record during the last deglaciation are analysed. Even so, there is still no continental record of temperature reconstruction during part of the last deglaciation in the Iberian Peninsula that can be compared with the latest record of fluid inclusions in speleothems in central Europe (Affolter et al., 2019).

In this new study, three stalagmites from Ostolo Cave in the Western Pyrenees were analysed to identify and characterize the timing of the climate variability along the abrupt changes that punctuated the last deglaciation and subsequently generate a reconstruction of the past temperature with the help of fluid inclusion water isotopes. The samples were dated at high precision and cover almost continuously the same period (16.5-10 kyr BP) with a high degree of replication. The speleothem δ18O and fluid inclusion water isotopes (δD) records follow closely the well-known changes from high latitudes showing more negative values during GS-1 and H1, related to colder climates, while more positive values were reached during GI-1 and the Early Holocene, pointing towards warmer temperatures. Our Ostolo Cave fluid inclusion temperature record resembles Greenland and Mediterranean sea surface temperature trends and allows for the first time and from a continental record, a continuous reconstruction of temperature throughout the last deglaciation in southern Europe.

How to cite: Bernal Wormull, J. L., Moreno Caballud, A., Dubliansky, Y., Spötl, C., Pérez-Mejías, C., Bartolomé, M., Iriarte, E., Arriolabengoa, M., Aranburu, A., Cacho, I., Cheng, H., and Edwards, R. L.: Northern Spain temperature constrained by fluid inclusion water isotopes in speleothems during the abrupt oscillations of the last deglaciation period, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-10772, https://doi.org/10.5194/egusphere-egu21-10772, 2021.

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