A high-altitude peatland record of environmental changes in the NW Argentine Andes (24 ° S) over the last 2100 years
A high-altitude peatland record of environmental changes in the NW Argentine Andes (24 ° S) over the last 2100 years
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DOI：
10.5194/cp-12-1165-2016
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发表时间：
2016-05
影响因子：
4.3
通讯作者：
K. Schittek;Sebastian T. Kock;A. Lücke;J. Hense;C. Ohlendorf;J. Kulemeyer;L. Lupo;F. Schäbitz
中科院分区：
文献类型：
--
作者：
K. Schittek;Sebastian T. Kock;A. Lücke;J. Hense;C. Ohlendorf;J. Kulemeyer;L. Lupo;F. Schäbitz
抽象的。高海拔缓冲泥炭地是高分辨率古环境研究的通用档案，因为它们的高积累速率、替代范围以及对气候和/或人类引起的变化的敏感性。特别是在中央安第斯山脉，关于全新世气候条件的知识有限。在这项研究中，我们介绍了过去2100年的环境和气候历史，位于阿根廷西北部干燥的普纳的Cerro Tuzgler泥炭地(CTP)，基于多代理方法。X射线荧光、稳定同位素和元素含量分析(δ13C、δ15N、TN和TOC)分析了整个层序的无机地球化学，揭示了泥炭地过去氧化还原条件的变化。花粉组合提供了区域尺度上的重大环境变化的洞察。在过去的2100年里，古气候变化很大。这些结果反映了全新世晚期显著的气候异常，并提供了原地湿度变化与热带辐合带(ITCZ)迁移相耦合的证据。从公元前150年左右到公元150年左右，有一段时间持续干旱。在公元200年至公元550年之间，出现了一个更潮湿的阶段。之后，气候的特点是更干燥和更潮湿的条件之间的变化，干旱大约在公元650-800年和公元1000-1100年。19世纪初(1815年坦博拉喷发)的火山强迫似乎对中安第斯山脉的气候环境产生了影响。在过去，泥炭地从气候扰动中恢复过来。今天，CTP被人为干预严重降解，泥炭沉积物越来越容易受到侵蚀和切割。
Abstract. 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, 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), located in the dry Puna of NW Argentina, based on a multi-proxy approach. X-ray fluorescence (XRF), stable isotope and element content analyses (δ13C, δ15N, TN and TOC) were conducted to analyse the inorganic geochemistry throughout the sequence, revealing changes in the peatlands' 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 in situ moisture changes were coupled to the migration of the Intertropical Convergence Zone (ITCZ). A period of sustained dry conditions prevailed from around 150 BC to around AD 150. A more humid phase dominated between AD 200 and AD 550. Afterwards, the climate was characterised by changes between drier and wetter conditions, with droughts at around AD 650–800 and AD 1000–1100. 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. Today, CTP is heavily degraded by human interventions, and the peat deposit is becoming increasingly susceptible to erosion and incision.