LUPO liliana concepcion
A high-altitude peatland record of environmental changes in the NW Argentine Andes (24 S) over the last 2100 years
SCHITTECK; KOCK; LUCKE; OHLENDORF; KULEMEYER; LUPO; SCHÄBITZ
CLIMATE OF THE PAST
Año: 2016 p. 1165 - 1180
High-altitude cushion peatlands are versatile archives for high-resolution palaeoenvironmental studies, due to their high accumulation rates, range of proxies and sensitivity to climatic and/or human-induced changes. Especially within the central Andes, 5 the knowledge about climate conditions during the Holocene is limited. In this study, we present the environmental and climatic history for the last 2100 years of Cerro Tuzgle peatland (CTP), which is located in the dry Puna of NW Argentina, based on a multi-proxy approach. X-ray fluorescence (XRF), stable isotope and element content analyses (δ 13C, δ 15N, TN and TOC) were conducted to analyse the inorganic geo- 10 chemistry throughout the sequence, revealing changes in the peatland?s past redox conditions. Pollen assemblages give an insight into substantial environmental changes on a regional scale. The palaeoclimate varied significantly during the last 2100 years. The results reflect prominent late Holocene climate anomalies and provide evidence that Northern Hemisphere temperature oscillations were extensive and affected the 15 southward migration of the Intertropical Convergence Zone (ITCZ), and hence, the intensity of moisture flux within the South American Summer Monsoon (SASM) belt. Volcanic forcing at the beginning of the 19th century (1815 Tambora eruption) seems to have had an impact on climatic settings in the central Andes. In the past, the peatland recovered from climatic perturbations. Nowadays, CTP is heavily degraded by human 20 interventions, and the peat deposit becomes increasingly susceptible to erosion and incision.