globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2016.08.003
论文题名:
Late Holocene environmental changes as recorded in the sediments of high Andean Laguna Chepical, Central Chile (32°S; 3050 m a.s.l.)
作者: Martel-Cea A.; Maldonado A.; Grosjean M.; Alvial I.; de Jong R.; Fritz S.C.; von Gunten L.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 461
起始页码: 44
结束页码: 54
语种: 英语
英文关键词: Andes ; Climate change ; Diatom ; ENSO ; Late Holocene ; Pollen
英文摘要: We present a reconstruction of environmental changes from sediments of high-altitude Laguna Chepical in the subtropical Andes of Central Chile (32°16′S; 70°30′W, 3050 m a.s.l.) for the past 3100 years. Based on subfossil pollen, microscopic charcoal and diatoms, we inferred changes in moisture (related to precipitation) and ice-cover/ice-free season (related to summer temperature) at decadal to millennial scales. Sustained wetter and colder summer temperatures than today prevailed between 1100 BC and ca. AD 1. Afterward, decreasing pollen accumulation rates and increased fire activity suggest drier conditions and possibly enhanced seasonality and/or inter-annual climate variability. Frequent changes between cold and warm summers were observed, particularly for the last 1000 years. About AD 1250 (during the Medieval Climate Anomaly), wet years and early break up of ice-cover occurred in central Chile, which is today typical for El Niño-like mean conditions. Conversely, and with the exception of a few wet pulses, a generally dry period with extended ice-cover (cool summers) was observed between AD 1400 and AD 1850 (Little Ice Age). This can be interpreted as a trend toward more La Niña-like mean conditions. Recent climate change and human disturbances during the last 100 years have prompted changes in diatom and plant communities that are unprecedented in the late Holocene. First, planktonic diatoms increased as a result of hydraulic interventions in the lake during the late 19th century, and secondly, the Andean vegetation shifted upward as result of recent warming, and the frequency of arboreal taxa was significantly reduced. At the same time peaks of fire activity were observed. © 2016 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68227
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作者单位: Escuela de Graduados, Facultad de Ciencias Forestales y Recursos Naturales, Universidad Austral de Chile, Transdisciplinary Center for Quaternary Research (TAQUACH), Independencia 631, Valdivia, Chile; Centro de Estudios Avanzados en Zonas Áridas, Universidad de La Serena, Raúl Bitrán 1305, La Serena, Chile; Departamento de Biología Marina, Universidad Católica del Norte, Larrondo 1281, Coquimbo, Chile; Oeschger Centre for Climate Change Research, Institute of Geography, University of Bern, Falkenplatz 16, Bern, Switzerland; Laboratorio de Ecología y Genética Poblacional, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Ñuñoa, Chile; Department of Earth and Atmospheric Sciences, University of Nebraska, Lincoln, NE, United States; PAGES International Project Office, Falkenplatz 16, Bern, Switzerland

Recommended Citation:
Martel-Cea A.,Maldonado A.,Grosjean M.,et al. Late Holocene environmental changes as recorded in the sediments of high Andean Laguna Chepical, Central Chile (32°S; 3050 m a.s.l.)[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,461
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