Mid-Holocene Iberian hydroclimate variability and paleoenvironmental change: molecular and isotopic insights from Praia Rei Cortico, Portugal

被引:10
作者
Taylor, Audrey K. [1 ]
Benedetti, Michael M. [1 ]
Haws, Jonathan A. [2 ]
Lane, Chad S. [1 ]
机构
[1] Univ North Carolina Wilmington, Dept Earth & Ocean Sci, Wilmington, NC 28403 USA
[2] Univ Louisville, Dept Anthropol, Louisville, KY 40292 USA
基金
美国国家科学基金会;
关键词
ecotone; hydroclimate; Iberia; isotope; North Atlantic Oscillation; NORTH-ATLANTIC OSCILLATION; N-ALKANE DISTRIBUTIONS; GEOLOGICAL RECORD; ATMOSPHERIC CIRCULATION; ENVIRONMENTAL-CHANGES; STORMINESS VARIATION; VEGETATION CHANGES; LATE PLEISTOCENE; SAND INVASION; PROXY RECORD;
D O I
10.1002/jqs.3000
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
At Praia Rei Cortico (PRC), coastal Portugal, we analyzed compound-specific isotopes of plant wax-derived n-alkanes in combination with molecular distribution proxies and C/N ratios to reconstruct hydrologic and environmental change in a mid-Holocene wetland. During this relatively brief segment of the Holocene (6.6-5.4k cal a BP), substantial shifts in the stable hydrogen isotope composition of terrestrially sourced C(29)n-alkanes (delta Dn-C29) record significant multi-decadal changes in precipitation origin and storm trajectory. Wetland formation at PRC occurred during a humid interval (6.6-6.5kcalaBP) with a dominantly tropical precipitation source, likely the result of a persistent negative phase of the North Atlantic Oscillation, which permitted the establishment and dominance of Sphagnum moss. A subsequent decrease in precipitation significantly reduced Sphagnum abundance at PRC, which is evidenced by decreased sedimentary C/N ratios and reduced mid-chain n-alkane abundances. From 5.9 to 5.4k cal a BP, relatively low delta Dn-C29 values coincide with sand invasion along the Iberian coast and cooling in the North Atlantic. Strong correspondence between Dn-C29 values and the occurrence of ice-rafted debris recorded in deep sea sediment cores during this period illustrate a marked North Atlantic control on the trajectory of mid-latitude storms and precipitation regimes in Iberia. (C) 2017 John Wiley & Sons, Ltd.
引用
收藏
页码:79 / 92
页数:14
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