DOI: 10.1016/j.gloplacha.2015.12.006
论文题名: Recent temperature trends in the South Central Andes reconstructed from sedimentary chrysophyte stomatocysts in Laguna Escondida (1742ma.s.l., 38°28S, Chile)
作者: De Jong R. ; Schneider T. ; Hernández-Almeida I. ; Grosjean M.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2016
卷: 137 起始页码: 24
结束页码: 34
语种: 英语
英文关键词: Anthropogenic warming
; Golden algae
; Southern Hemisphere
; Transfer function
; Winter temperature
Scopus关键词: Lakes
; Meteorology
; Sea level
; Sedimentology
; Surface waters
; Transfer functions
; Anthropogenic warming
; Cooling temperature
; High-resolution reconstruction
; Meteorological measurements
; Meteorological station
; Northern Hemispheres
; Southern Hemisphere
; Surface water temperature
; Atmospheric temperature
; anthropogenic effect
; brown alga
; climate change
; climate modeling
; cyst
; global warming
; lacustrine deposit
; pristine environment
; sedimentary feature
; Southern Hemisphere
; temporal analysis
; transfer function
; water temperature
; winter
; Alps
; Argentina
; CALABARZON
; Chubut
; Escondida Island
; Laguna [Calabarzon]
; Philippines
; Pyrenees
; Chrysophyceae
英文摘要: In this study we present a quantitative, high resolution reconstruction of past austral winter length in the Chilean Andes at 38°S from AD 1920 to 2009. For Laguna Escondida, a nearly pristine lake situated on the flanks of the Andes at 1740m above sea level, past variability in the duration of the winter season (Days T4°C) was reconstructed. Because high elevation meteorological stations are absent in this region, the reconstruction provides novel insights into recent temperature trends in the central-southern Andes. As a cold-season temperature proxy, we used chrysophyte stomatocysts. This novel proxy for cold season temperature was so far applied successfully in the European Alps and Pyrenees but has not yet been tested in the Southern Hemisphere. The reconstruction in this study was based on a newly developed Transfer Function to estimate Days T4°C (number of consecutive days with surface water temperatures at or below 4°C) from sedimentary stomatocyst assemblages (R2 boot=0.8, RMSEPboot=28.7days (=half the standard deviation)). To develop a high quality TF model, sediment traps and thermistors were placed in thirty remote lakes along an altitude gradient (420-2040ma.s.l.). Complete materials and data were collected in 24 lakes after one year. Detailed statistical analyses indicate that modern stomatocysts primarily respond to the length of the cold season. The TF model was then applied to the sedimentary stomatocysts from a 210Pb-dated short core of L. Escondida. Comparison to independent reanalysis data showed that reconstructed changes in Days T4°C provides detailed information on winter-spring temperature variability since AD 1920. The reconstruction shows that recent warming (onset in AD 1980) in the southern Chilean Andes was not exceptional in the context of the past century. This is in strong contrast to studies from the Northern Hemisphere. The finding is also in contrast to the cooling temperature trends which were detected using meteorological measurement data in low altitude sites along the Chilean coast. This finding confirms that coastal meteorological station data in this region do not reliably reflect recent temperature trends at high altitudes. Moreover, it implies a southward shift of the northern border of the Westerlies wind belt. This study clearly illustrates the importance of quantitative, high resolution studies from remote sites, in particular at high elevation mountain areas. © 2015 . URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84952002960&doi=10.1016%2fj.gloplacha.2015.12.006&partnerID=40&md5=63003770981626e7716f636635ecb5c4
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11716
Appears in Collections: 全球变化的国际研究计划 气候变化与战略
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作者单位: Institute of Geography, University of Bern, Erlachstrasse 9a, Bern, Switzerland
Recommended Citation:
De Jong R.,Schneider T.,Hernández-Almeida I.,et al. Recent temperature trends in the South Central Andes reconstructed from sedimentary chrysophyte stomatocysts in Laguna Escondida (1742ma.s.l., 38°28S, Chile)[J]. Global and Planetary Change,2016-01-01,137.