60 years of scientific deep drilling in Colombia: the north Andean guide to the Quaternary
Henry Hooghiemstra
CORRESPONDING AUTHOR
Institute for Biodiversity and Ecosystem Dynamics, Department of
Ecosystem and Landscape Dynamics, University of Amsterdam, Science Park 904,
1098 XH Amsterdam, the Netherlands
Gustavo Sarmiento Pérez
Servicio Geológico de Colombia (Ingeominas), Bogotá, Colombia
currently at: Departamento de Geociencias, Universidad Nacional de Colombia, Bogotá, Colombia
Vladimir Torres Torres
Institute for Biodiversity and Ecosystem Dynamics, Department of
Ecosystem and Landscape Dynamics, University of Amsterdam, Science Park 904,
1098 XH Amsterdam, the Netherlands
Exploration and New Ventures, ExxonMobil, 22777 Springwoods Village Parkway, Spring, Texas 77389, USA
Juan-Carlos Berrío
Institute for Biodiversity and Ecosystem Dynamics, Department of
Ecosystem and Landscape Dynamics, University of Amsterdam, Science Park 904,
1098 XH Amsterdam, the Netherlands
Department of Geography, University of Leicester, Leicester, UK
Lucas Lourens
Department of Geosciences, Utrecht University, Utrecht, the Netherlands
Suzette G. A. Flantua
CORRESPONDING AUTHOR
Institute for Biodiversity and Ecosystem Dynamics, Department of
Ecosystem and Landscape Dynamics, University of Amsterdam, Science Park 904,
1098 XH Amsterdam, the Netherlands
Department of Biological Sciences, University of Bergen, 5020
Bergen, Norway
Bjerknes Centre for Climate Research, University of Bergen, 5020
Bergen, Norway
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Shruti Setty, Henk A. Dijkstra, Lucas J. Lourens, Egbert H. van Nes, Marlow J. Cramwinckel, Ingrid A. van de Leemput, and Appy Sluijs
EGUsphere, https://doi.org/10.5194/egusphere-2026-5433, https://doi.org/10.5194/egusphere-2026-5433, 2026
This preprint is open for discussion and under review for Earth System Dynamics (ESD).
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We studied the dynamic causal relationship in the climate-carbon cycle system in the past 66 million years using machine learning approaches in continuous high-resolution deep ocean climate and carbon cycle proxies. Our study suggests strong causality during warm climate states and insignificant causality in others. Our study also points towards an orbital influence and strengthening positive feedbacks towards both abrupt warming and cooling events hypothesized to be due to tipping points.
Suning Hou, Leonie Toebrock, Mart van der Linden, Fleur Rothstegge, Martin Ziegler, Lucas J. Lourens, and Peter K. Bijl
Clim. Past, 21, 79–93, https://doi.org/10.5194/cp-21-79-2025, https://doi.org/10.5194/cp-21-79-2025, 2025
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Based on dinoflagellate cyst assemblages and sea surface temperature records west of offshore Tasmania, we find a northward migration and freshening of the subtropical front, not at the M2 glacial maximum but at its deglaciation phase. This oceanographic change aligns well with trends in pCO2. We propose that iceberg discharge from the M2 deglaciation freshened the subtropical front, which together with the other oceanographic changes affected atmosphere–ocean CO2 exchange in the Southern Ocean.
David A. Hodell, Simon J. Crowhurst, Lucas Lourens, Vasiliki Margari, John Nicolson, James E. Rolfe, Luke C. Skinner, Nicola C. Thomas, Polychronis C. Tzedakis, Maryline J. Mleneck-Vautravers, and Eric W. Wolff
Clim. Past, 19, 607–636, https://doi.org/10.5194/cp-19-607-2023, https://doi.org/10.5194/cp-19-607-2023, 2023
Short summary
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We produced a 1.5-million-year-long history of climate change at International Ocean Discovery Program Site U1385 of the Iberian margin, a well-known location for rapidly accumulating sediments on the seafloor. Our record demonstrates that longer-term orbital changes in Earth's climate were persistently overprinted by abrupt millennial-to-centennial climate variability. The occurrence of abrupt climate change is modulated by the slower variations in Earth's orbit and climate background state.
Rick Hennekam, Katharine M. Grant, Eelco J. Rohling, Rik Tjallingii, David Heslop, Andrew P. Roberts, Lucas J. Lourens, and Gert-Jan Reichart
Clim. Past, 18, 2509–2521, https://doi.org/10.5194/cp-18-2509-2022, https://doi.org/10.5194/cp-18-2509-2022, 2022
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The ratio of titanium to aluminum (Ti/Al) is an established way to reconstruct North African climate in eastern Mediterranean Sea sediments. We demonstrate here how to obtain reliable Ti/Al data using an efficient scanning method that allows rapid acquisition of long climate records at low expense. Using this method, we reconstruct a 3-million-year North African climate record. African environmental variability was paced predominantly by low-latitude insolation from 3–1.2 million years ago.
Anna Joy Drury, Diederik Liebrand, Thomas Westerhold, Helen M. Beddow, David A. Hodell, Nina Rohlfs, Roy H. Wilkens, Mitchell Lyle, David B. Bell, Dick Kroon, Heiko Pälike, and Lucas J. Lourens
Clim. Past, 17, 2091–2117, https://doi.org/10.5194/cp-17-2091-2021, https://doi.org/10.5194/cp-17-2091-2021, 2021
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We use the first high-resolution southeast Atlantic carbonate record to see how climate dynamics evolved since 30 million years ago (Ma). During ~ 30–13 Ma, eccentricity (orbital circularity) paced carbonate deposition. After the mid-Miocene Climate Transition (~ 14 Ma), precession (Earth's tilt direction) increasingly drove carbonate variability. In the latest Miocene (~ 8 Ma), obliquity (Earth's tilt) pacing appeared, signalling increasing high-latitude influence.
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Short summary
This is a brief overview of long continental fossil pollen records globally in relationship with marine records. Specifically, the Northern Andes is a key area in developing and testing hypotheses in the fields of ecology, paleobiogeography, and climate change in tropical regions. We review 60 years of deep drilling experience in this region that have led to landmark records. We also highlight the early development of long continental pollen records from unique, deep, sediment-filled basins.
This is a brief overview of long continental fossil pollen records globally in relationship with...

