Orbital-to-millennial scale climate variability during Marine Isotope Stages 5 to 3 in northeast Iberia

QUATERNARY SCIENCE REVIEWS

卷:224

Article

Perez-Mejias, Carlos^1,2,3  Moreno, Ana²  Sancho, Carlos³  Martin-Garcia, Rebeca⁴  Spoetl, Christoph⁵  Cacho, Isabel⁶  Cheng, Hai^1,7  Edwards, R. Lawrence⁷ 

[1] Xi An Jiao Tong Univ, Inst Global Environm Change, Xian 710049, Shaanxi, Peoples R China

[2] CSIC, Pyrenean Inst Ecol, Dept Geoenvironm Proc & Global Change, Avda Montanana 1005, Zaragoza 50059, Spain

[3] Univ Zaragoza, Dept Earth Sci, C Pedro Cerbuna 12, E-50009 Zaragoza, Spain

[4] CNRS, UMR 5321, Stn Ecol Theor & Expt, 2 Route CNRS, F-09200 Moulis, France

[5] Univ Innsbruck, Inst Geol, Innrain 52, A-6020 Innsbruck, Austria

[6] Univ Barcelona, Fac Ciencies Terra, Dept Dinam Terra & Ocea, C Marti Franques S-N, E-08028 Barcelona, Spain

[7] Univ Minnesota, Dept Earth & Environm Sci, John T Tate Hall,116 Church St SE, Minneapolis, MN 55455 USA

关键词: Stalagmite;    Stable isotopes;    Orbital-millennial scale;    Last glacial period;    Western mediterranean;   

DOI  :  10.1016/j.quascirev.2019.105946

来源: Elsevier

【 摘 要 】

The climate during the last glacial cycle was characterized by abrupt millennial-scale changes superimposed on long-term orbital control. This study examines this climate variability for northeast Iberia for the time interval 118.9 to 36.9 kyr using a multi-proxy approach (delta O-18, delta C-13 and Mg/Ca) applied to a stalagmite that covers this period continuously. During Marine Isotope Stage (MIS) 5 and 4, delta O-18 is controlled by orbital pacing, whereby more humid conditions prevailed during minima in boreal summer precession. In contrast, during MIS 3 delta O-18 lags precession and co-varies with delta C-13 (rho = 0.53, p-value < 0.001, n = 500), suggesting a common control of both isotopes by reduced precipitation during dry periods. delta C-13 shows a positive correlation with Mg/Ca, reflecting water availability, vegetation productivity and microbial activity in the catchment of the cave's drip water. The delta C-13 values exhibit a response to Heinrich Stadials (HS) and other cold marine events (e.g. C26 to C23), as well as Dansgaard-Oeschger oscillations (D-O). The Last Interglacial ended at 108.6 +/- 0.3 kyr at this site. Two periods with a marked W-shape pattern in delta C-13 can be recognized between 70 and 50 kyr (hereafter multi-event). The older multi-event (including HS-6 and D-O 18) is characterized in the North Atlantic by high IRD discharges and cold sea-surface temperatures, while the two phases attending to the hydrology in the study area suggest dry conditions prior to HS-6. A dry climate prevailed during the younger multi-event (including HS-5a and D-O 15), coincident with an increase in productivity-related foraminifera species at lower latitudes, suggesting a reinforcement of the trade winds associated with a stronger Hadley Cell. (C) 2019 Elsevier Ltd. All rights reserved.

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