A 15 000 cal a paleoclimatic record from Laguna del Viento (33°S), Subtropical Andes, central Chile

Subtropical zones are crucial for understanding climate dynamics, as they strongly control the subtropical anticyclone system and serve as a bridge between the tropical and temperate regions of the planet. Therefore, understanding the long‐term dynamics of these areas is vital on a hemispheric scale...

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Veröffentlicht in:Journal of quaternary science 2024-11
Hauptverfasser: Rodríguez‐Contreras, Diego, Maldonado, Antonio, Flores‐Aqueveque, Valentina, Villaseñor, Tania, de Porras, María Eugenia, Muñoz, Praxedes
Format: Artikel
Sprache:eng
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Zusammenfassung:Subtropical zones are crucial for understanding climate dynamics, as they strongly control the subtropical anticyclone system and serve as a bridge between the tropical and temperate regions of the planet. Therefore, understanding the long‐term dynamics of these areas is vital on a hemispheric scale. A continuous late Pleistocene climate record based on sedimentological proxies was reconstructed using a lacustrine core from the Chilean Subtropical Andes (~33°S). Since the late Pleistocene, high lake levels subjected to cold and wet conditions prevailed between ~15.4 and 14k cal a  bp , followed by glacier retreat between 14 and 13.7k cal a  bp . The Pleistocene–Holocene transition is marked by increasing sedimentological parameter values and organic matter content, recording a significant shift in the environmental conditions. Decreased lake levels and high‐energy events predominated until ~8.5k cal a  bp , followed by warm and arid conditions with high‐energy/runoff events from 8.5 to 5.2k cal a  bp , with the driest period occurring ~6.4k cal a  bp . Turbiditic flows appear between 5.2 and 2.6k cal a  bp , and cold conditions between 2.6 and 2.3k cal a  bp . From 1720 to 960 cal a  bp , cold and wet conditions predominated. Warm and wet conditions prevailed to the present, with a brief return to cold and dry conditions at 720 cal a  bp . Important widely represented events such as the Last Glacial termination, early to mid‐Holocene Transition and Little Ice Age are present in the core record.
ISSN:0267-8179
1099-1417
DOI:10.1002/jqs.3662