Arid
DOI10.1016/j.epsl.2016.07.049
Elevation-dependent changes in n-alkane delta D and soil GDGTs across the South Central Andes
Nieto-Moreno, Vanesa1; Rohrmann, Alexander2; van der Meer, Marcel T. J.3,4; Damste, Jaap S. Sinninghe3,4,5; Sachse, Dirk2,6; Tofelde, Stefanie2,6; Niedermeyer, Eva M.1; Strecker, Manfred R.2; Mulch, Andreas1,7
通讯作者Nieto-Moreno, Vanesa
来源期刊EARTH AND PLANETARY SCIENCE LETTERS
ISSN0012-821X
EISSN1385-013X
出版年2016
卷号453页码:234-242
英文摘要

Surface uplift of large plateaus may significantly influence regional climate and more specifically precipitation patterns and temperature, sometimes complicating paleoaltimetry interpretations. Thus, understanding the topographic evolution of tectonically active mountain belts benefits from continued development of reliable proxies to reduce uncertainties in paleoaltimetry reconstructions. Lipid biomarker-based proxies provide a novel approach to stable isotope paleoaltimetry and complement authigenic or pedogenic mineral proxy materials, in particular outside semi-arid climate zones where soil carbonates are not abundant but (soil) organic matter has a high preservation potential. Here we present delta D values of soil-derived n-alkanes and mean annual air temperature (MAT) estimates based on branched glycerol dialkyl glycerol tetraether (brGDGT) distributions to assess their potential for paleoelevation reconstructions in the southern central Andes. We analyzed soil samples across two environmental and hydrological gradients that include a hillslope (26-28 degrees S) and a valley (22-24 degrees S) transect on the windward flanks of Central Andean Eastern Cordillera in NW Argentina. Our results show that present-day n-alkane delta D values and brGDGT-based MAT estimates are both linearly related with elevation and in good agreement with present-day climate conditions. Soil n-alkanes show a delta D lapse rate (A(delta D)) of -1.64 parts per thousand/100 m (R-2 = 0.91, p < 0.01) at the hillslope transect, within the range of delta D lapse rates from precipitation and surface waters in other tropical regions in the Andes like the Eastern Cordillera in Colombia and Bolivia and the Equatorial and Peruvian Andes. BrGDGT-derived soil temperatures are similar to monitored winter temperatures in the region and show a lapse rate of Delta T = -0.51 degrees C/100 m (R-2 = 0.91, p < 0.01), comparable with lapse rates from in situ soil temperature measurements, satellite derived land-surface temperatures at this transect, and weather stations from the Eastern Cordillera at similar latitude. As a result of an increasing leeward sampling position along the valley transect lapse rates are biased towards lower values and display higher scatter (Delta(delta D) = -0.9 parts per thousand/100 m, R-2 = 0.76, p < 0.01 and Delta T = -0.19 degrees C/100 m, R-2 = 0.48, p < 0.05). Despite this higher complexity, they are in line with lapse rates from stream-water samples and in situ soil temperature measurements along the same transect. Our results demonstrate that both soil n-alkane delta D values and MAT reconstructions based on brGDGTs distributions from the hillslope transect (Delta(delta D) = -1.64 parts per thousand/100 m, R-2 = 0.91, p < 0.01 and Delta T = -0.51 degrees C/100 m, R-2 = 0.91, p < 0.01) track the direct effects of orography on precipitation and temperature and hence the combined effects of local and regional hydrology as well as elevation. (C) 2016 Elsevier B.V. All rights reserved.


英文关键词South Central Andes leaf-wax n-alkane delta D branched GDGTs MAT(mr) paleothermometer paleoaltimetry proxies attitudinal transects
类型Article
语种英语
国家Germany ; Netherlands
收录类别SCI-E
WOS记录号WOS:000383932300023
WOS关键词DIALKYL GLYCEROL TETRAETHERS ; ISOTOPE-BASED PALEOALTIMETRY ; STABLE-ISOTOPES ; LATE MIOCENE ; ALTITUDINAL TRANSECT ; LIPID DISTRIBUTION ; MEMBRANE-LIPIDS ; SIERRA-NEVADA ; CLIMATE ; PROXY
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/192297
作者单位1.Senckenberg Biodivers & Climate Res Ctr, Senckenberganlage 25, D-60325 Frankfurt, Germany;
2.Univ Potsdam, Inst Erd & Umweltwisssensch, D-14476 Potsdam, Germany;
3.NIOZ Royal Netherlands Inst Sea Res, Dept Marine Microbiol & Biogeochem, POB 59, NL-1790 AB Den Burg, Texel, Netherlands;
4.Univ Utrecht, POB 59, NL-1790 AB Den Burg, Texel, Netherlands;
5.Univ Utrecht, Fac Geosci, Dept Earth Sci, POB 80-121, NL-3508 TA Utrecht, Netherlands;
6.GFZ German Res Ctr Geosci, Sect Geomorphol 51, D-14473 Potsdam, Germany;
7.Goethe Univ Frankfurt, Inst Geowissensch, D-60438 Frankfurt, Germany
推荐引用方式
GB/T 7714
Nieto-Moreno, Vanesa,Rohrmann, Alexander,van der Meer, Marcel T. J.,et al. Elevation-dependent changes in n-alkane delta D and soil GDGTs across the South Central Andes[J],2016,453:234-242.
APA Nieto-Moreno, Vanesa.,Rohrmann, Alexander.,van der Meer, Marcel T. J..,Damste, Jaap S. Sinninghe.,Sachse, Dirk.,...&Mulch, Andreas.(2016).Elevation-dependent changes in n-alkane delta D and soil GDGTs across the South Central Andes.EARTH AND PLANETARY SCIENCE LETTERS,453,234-242.
MLA Nieto-Moreno, Vanesa,et al."Elevation-dependent changes in n-alkane delta D and soil GDGTs across the South Central Andes".EARTH AND PLANETARY SCIENCE LETTERS 453(2016):234-242.
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