首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Late Holocene sea-surface temperature and precipitation variability in northern Patagonia, Chile (Jacaf Fjord, 44°S)
Authors:Julio Sepúlveda  Silvio Pantoja  Konrad A Hughen  Sbastien Bertrand  Dante Figueroa  Tania Len  Nicholas J Drenzek  Carina Lange
Institution:Julio Sepúlveda, Silvio Pantoja, Konrad A. Hughen, Sébastien Bertrand, Dante Figueroa, Tania León, Nicholas J. Drenzek,Carina Lange
Abstract:A high-resolution multi-proxy study including the elemental and isotopic composition of bulk organic matter, land plant-derived biomarkers, and alkenone-based sea-surface temperature (SST) from a marine sedimentary record obtained from the Jacaf Fjord in northern Chilean Patagonia (not, vert, similar44°20′S) provided a detailed reconstruction of continental runoff, precipitation, and summer SST spanning the last 1750 yr. We observed two different regimes of climate variability in our record: a relatively dry/warm period before 900 cal yr BP (lower runoff and average SST 1°C warmer than present day) and a wet/cold period after 750 cal yr BP (higher runoff and average SST 1°C colder than present day). Relatively colder SSTs were found during 750–600 and 450–250 cal yr BP, where the latter period roughly corresponds to the interval defined for the Little Ice Age (LIA). Similar climatic swings have been observed previously in continental and marine archives of the last two millennia from central and southern Chile, suggesting a strong latitudinal sensitivity to changes in the Southern Westerly Winds, the main source of precipitation in southern Chile, and validating the regional nature of the LIA. Our results reveal the importance of the Chilean fjord system for recording climate changes of regional and global significance.
Keywords:Holocene  Westerly Winds  Chile  Northern Patagonia  Jacaf Fjord  Precipitation  Sea-surface temperature  Lipid biomarkers
本文献已被 ScienceDirect 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号