DOI: 10.1016/j.quascirev.2015.02.006
Scopus记录号: 2-s2.0-84924232224
论文题名: Lateglacial and Holocene climatic changes in south-eastern Patagonia inferred from carbonate isotope records of Laguna Potrok Aike (Argentina)
作者: Oehlerich M. ; Mayr C. ; Gussone N. ; Hahn A. ; Hölzl S. ; Lücke A. ; Ohlendorf C. ; Rummel S. ; Teichert B.M.A. ; Zolitschka B.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 114 起始页码: 189
结束页码: 202
语种: 英语
英文关键词: Calcite
; Calcium isotopes
; Carbon isotopes
; ICDP
; Ikaite
; Lake sediment
; Oxygen isotopes
; PASADO
; Southern South America
; Strontium isotopes
Scopus关键词: Budget control
; Calcite
; Calcium
; Calcium carbonate
; Carbon
; Carbonation
; Climate change
; Glacial geology
; Isotopes
; Lakes
; Oxygen
; Sediments
; Calcium isotopes
; Carbon isotopes
; ICDP
; Ikaite
; Lake sediments
; Oxygen isotopes
; PASADO
; Southern south america
; Strontium isotopes
; Strontium
; carbonate
; climate variation
; evaporation
; Holocene
; ikaite
; isotopic composition
; lacustrine deposit
; late glacial
; oxygen isotope
; paleoclimate
; paleotemperature
; proxy climate record
; strontium isotope
; westerly
; Argentina
; Laguna Potrok Aike
; Patagonia
; Santa Cruz [Argentina]
英文摘要: First results of strontium, calcium, carbon and oxygen isotope analyses of bulk carbonates from a 106m long sediment record of Laguna Potrok Aike, located in southern Patagonia are presented. Morphological and isotopic investigations of μm-sized carbonate crystals in the sediment reveal an endogenic origin for the entire Holocene. During this time period the calcium carbonate record of Laguna Potrok Aike turned out to be most likely ikaite-derived. As ikaite precipitation in nature has only been observed in a narrow temperature window between 0 and 7°C, the respective carbonate oxygen isotope ratios serve as a proxy of hydrological variations rather than of palaeotemperatures. We suggest that oxygen isotope ratios are sensitive to changes of the lake water balance induced by intensity variations of the Southern Hemisphere Westerlies and discuss the role of this wind belt as a driver for climate change in southern South America. In combination with other proxy records the evolution of westerly wind intensities is reconstructed. Our data suggest that weak SHW prevailed during the Lateglacial and the early Holocene, interrupted by an interval with strengthened Westerlies between 13.4 and 11.3kacalBP. Wind strength increased at 9.2kacalBP and significantly intensified until 7.0kacalBP. Subsequently, the wind intensity diminished and stabilised to conditions similar to present day after a period of reduced evaporation during the "Little Ice Age". Strontium isotopes (87Sr/86Sr ratio) were identified as a potential lake-level indicator and point to a lowering from overflow conditions during the Glacial (~17kacalBP) to lowest lake levels around 8kacalBP. Thereafter the strontium isotope curve resembles the lake-level curve which is stepwise rising until the "Little Ice Age". The variability of the Ca isotope composition of the sediment reflects changes in the Ca budget of the lake, indicating higher degrees of Ca utilisation during the period with lowest lake level. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59975
Appears in Collections: 过去全球变化的重建
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作者单位: Department für Geo- und Umweltwissenschaften, Ludwig-Maximilians Universität München, Munich, Germany; Geo-Bio-Center, Ludwig-Maximilians Universität München, Munich, Germany; Institut für Mineralogie, Universität Münster, Münster, Germany; GEOPOLAR, Institut für Geographie, Universität Bremen, Bremen, Germany; RiesKraterMuseum, Nördlingen, Germany; Institut für Bio- und Geowissenschaften, IBG-3: Agrosphere, Forschungszentrum Jülich, Jülich, Germany; Institut für Geologie und Paläontologie, Universität Münster, Münster, Germany
Recommended Citation:
Oehlerich M.,Mayr C.,Gussone N.,et al. Lateglacial and Holocene climatic changes in south-eastern Patagonia inferred from carbonate isotope records of Laguna Potrok Aike (Argentina)[J]. Quaternary Science Reviews,2015-01-01,114