DOI: 10.1016/j.quascirev.2012.05.025
Scopus记录号: 2-s2.0-84878919582
论文题名: The last Glacial-Interglacial transition in Patagonia, Argentina: The stable isotope record of bulk sedimentary organic matter from Laguna Potrok Aike
作者: Zhu J. ; Lücke A. ; Wissel H. ; Müller D. ; Mayr C. ; Ohlendorf C. ; Zolitschka B.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 71 起始页码: 205
结束页码: 218
语种: 英语
英文关键词: ICDP
; Lake sediments
; Last deglaciation
; PASADO
; Primary productivity
; South America
; Stable carbon and nitrogen isotopes
Scopus关键词: ICDP
; Lake sediments
; Last deglaciation
; PASADO
; Primary productivity
; South America
; Stable carbon and nitrogen isotopes
; Biogeochemistry
; Biological materials
; Cluster analysis
; Isotopes
; Lakes
; Nitrates
; Nutrients
; Organic compounds
; Photosynthesis
; Sedimentology
; Phytoplankton
; carbon isotope
; cluster analysis
; deglaciation
; environmental conditions
; glacial-interglacial cycle
; growing season
; Last Glacial Maximum
; macrophyte
; nitrogen isotope
; organic matter
; phytoplankton
; primary production
; proxy climate record
; sediment chemistry
; sediment core
; stable isotope
; Argentina
; Laguna Potrok Aike
; Patagonia
; Santa Cruz [Argentina]
英文摘要: An investigation of stable isotope (δ13CTOC and δ15NTN) and elemental parameters (TOC, TN contents and TOC/TN ratios) of bulk organic matter (<200μm) from sediment cores recovered from the Patagonian lake Laguna Potrok Aike (Argentina) in the framework of the ICDP deep drilling project PASADO provided insights into past changes in lake primary productivity and environmental conditions in South Patagonia throughout the last Glacial-Interglacial transition. Stratigraphically constrained cluster analyses of all proxy parameters suggest four main phases. From ca 26,100 to 17,300cal.yearsBP, lacustrine phytoplankton was presumably the predominant organic matter source in an aquatic environment with low primary productivity rates. At around 17,300cal.years BP, abrupt and distinct shifts of isotopic and elemental values indicate that the lacustrine system underwent a rapid reorganization. Lake primary productivity (phytoplankton and aquatic macrophytes) shows higher levels albeit with large variations during most of the deglaciation until 13,000cal.yearsBP. The main causes for this development can be seen in improved growing conditions for primary producers because of deglacial warming in combination with expedient availability of nutrients and likely calm wind conditions. After 13,000cal.yearsBP, decreased δ13CTOC values, TOC, TN contents and TOC/TN ratios indicate that the lake approached a new state with reduced primary productivity probably induced by unfavourable growing conditions for primary producers like strengthened winds and reduced nutrient availability. The steady increase in δ15NTN values presumably suggests limitation of nitrate supply for growth of primary producers resulting from a nutrient shortage after the preceding phase with high productivity. Nitrate limitation and consequent decreased lacustrine primary productivity continued into the early Holocene (10,970-8400cal.yearsBP) as reflected by isotopic and elemental values. © 2012 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60617
Appears in Collections: 过去全球变化的重建
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作者单位: Institute of Bio- and Geosciences, Research Center Jülich, IBG-3: Agrosphere, D-52428 Jülich, Germany; Institute of Geography, University of Erlangen-Nürnberg, D-91054 Erlangen, Germany; GeoBio-Center and Dept. of Earth and Environmental Sciences, University of Munich, D-80333 Munich, Germany; GEOPOLAR, Institute of Geography, University of Bremen, D-28359 Bremen, Germany
Recommended Citation:
Zhu J.,Lücke A.,Wissel H.,et al. The last Glacial-Interglacial transition in Patagonia, Argentina: The stable isotope record of bulk sedimentary organic matter from Laguna Potrok Aike[J]. Quaternary Science Reviews,2013-01-01,71