Articles | Volume 20, issue 4
https://doi.org/10.5194/cp-20-817-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-20-817-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
08 Apr 2024
Research article |
| 08 Apr 2024
| 08 Apr 2024
Holocene environmental and climate evolution of central west Patagonia as reconstructed from lacustrine sediments of Meseta Chile Chico (46.5° S, Chile)
Carolina Franco
CORRESPONDING AUTHOR
Institute of Geography, GEOPOLAR, University of Bremen, Bremen, Germany
Antonio Maldonado
Centro de Estudios Avanzados en Zonas Áridas (CEAZA), La Serena, Chile
Departamento de Biología Marina, Universidad Católica del Norte, Coquimbo, Chile
Christian Ohlendorf
Institute of Geography, GEOPOLAR, University of Bremen, Bremen, Germany
A. Catalina Gebhardt
Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research (AWI), Bremerhaven, Germany
María Eugenia de Porras
IANIGLA, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Mendoza, Argentina
Amalia Nuevo-Delaunay
Centro de Investigación en Ecosistemas de la Patagonia (CIEP), Coyhaique, Chile
César Méndez
Centro de Investigación en Ecosistemas de la Patagonia (CIEP), Coyhaique, Chile
Bernd Zolitschka
Institute of Geography, GEOPOLAR, University of Bremen, Bremen, Germany
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We analyzed Lake Holzmaar sediments using hyperspectral imaging and geochemistry to track ecosystem responses to rapid warming. We found that while rising temperatures enabled stratification, forest expansion was the decisive trigger for oxygen depletion by shielding the lake from wind. Holzmaar’s iron-rich geology prevented nutrient recycling, allowing immediate recovery once the climate cooled. This proves catchment traits can override climate impacts.
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We aim at testing and evaluating geochemical proxies and material for radiocarbon dating for their reliability and consistency at the Palaeolithic site Kammern-Grubgraben (Lower Austria). While carbonate and organic carbon contents are interpreted in terms of palaeoclimate variability, pedogenic carbonates turned out to be of Holocene age. As a consequence, the proxy data assessed here are differentially suitable for environmental reconstructions.
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Short summary
We present a continuous record of lake sediments spanning the Holocene from central west Patagonia. By examining various indicators like elemental composition and grain size data, we found that, around ~5500 years ago, the way sediments settled in the lake changed. On a regional scale, our results suggest that rainfall, influenced by changes in the Southern Hemisphere Westerly Winds, played a key role in shaping the environment of the region for the past ~10 000 years.
We present a continuous record of lake sediments spanning the Holocene from central west...
