North Iberian temperature and rainfall seasonality over the Younger Dryas and Holocene

QUATERNARY SCIENCE REVIEWS

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Article

Baldini, Lisa M.¹  Baldini, James U. L.²  McDermott, Frank^3,4  Arias, Pablo⁵  Cueto, Marian⁵  Fairchild, Ian J.⁶  Hoffmann, Dirk L.^7,8,9  Mattey, David P.¹⁰  Mueler, Wolfgang^10,11  Nita, Dan Constantin^7,12  Ontanon, Roberto⁵  Garcia-Monco, Cristina⁵  Richards, David A.⁷ 

[1] Univ Durham, Dept Geog, Sci Labs, South Rd, Durham DH1 3LE, England

[2] Univ Durham, Dept Earth Sci, Sci Labs, South Rd, Durham DH1 3LE, England

[3] Univ Coll Dublin, UCD Sch Geol Sci, Dublin 4, Ireland

[4] Univ Coll Dublin, UCD Earth Inst, Dublin 4, Ireland

[5] Univ Cantabria, Govt Cantabria Santander, Int Inst Prehisto Res Cantabria, Ave Los Castros 52, Santander, Spain

[6] Univ Birmingham, Sch Geog Earth & Environm Sci, Birmingham B15 2TT, W Midlands, England

[7] Univ Bristol, Sch Geog Sci, Univ Rd, Bristol BS8 1SS, Avon, England

[8] CENIEH, Paseo Sierra de Atapuerca S-N, Burgos 09002, Spain

[9] Max Planck Inst Evolutionary Anthropol, Dept Human Evolut, Deutsch Pl 6, D-04103 Leipzig, Germany

[10] Royal Holloway Univ London, Dept Earth Sci, Egham TW20 0EX, Surrey, England

[11] Goethe Univ Frankfurt, Inst Geowissensch, Altenhoferallee 1, D-60438 Frankfurt, Germany

[12] Babes Bolyai Univ, Fac Environm Sci & Engn, Cluj Napoca, Romania

关键词: Holocene;    Younger Dryas;    Palaeoclimatology;    Western Europe;    Speleothems;    Stalagmites;    Oxygen isotopes;    Trace elements;    Seasonality;   

DOI  :  10.1016/j.quascirev.2019.105998

来源: Elsevier

【 摘 要 】

Several stalagmite records have yielded important but discontinuous insights into northern Iberian climate since the Last Glacial. Here we present the first continuous Iberian stalagmite-based reconstruction of climate since the Bolling-Allered interstadial, from a single stalagmite sample (GAR-01 from La Garma Cave, Cantabria). The similar to 13.5 ka GAR-01 record provides the opportunity for replication, continuation, and aggregation of previously published records from northern Spain. The GAR-01 record reveals shifts in oxygen isotope ratios that are inexplicable by appealing to a single control (i.e., exclusively temperature, rainfall amount, etc.). Herein we explore the potential role of rainfall and temperature seasonality shifts on the new delta O-18 record using a simple Monte Carlo approach to estimate the seasonal distribution of rainfall and the annual temperature range at 100-year timeslices across the record. This model is corroborated by intervals of monthly-resolved laser ablation trace element data, providing glimpses into past Iberian seasonality shifts. The most salient features of the modelled results include extremely dry Younger Dryas winters (similar to 12.9-11.6 ka BP) and several intervals during the mid-Holocene with almost no summer rainfall (e.g., at 4.2 and 9.0 ka BP). By 1.6 ka BP, a near-modern rainfall seasonality was established. According to the modelling results, seasonal rainfall and temperature distribution variability can account for 95% of the record. The model presented here provides a new tool for extracting critical missing seasonality information from stalagmite delta O-18 records. Intervals where the model does not converge may represent transient climate anomalies with unusual origins that warrant further investigation. (C) 2019 Published by Elsevier Ltd.

【 授权许可】

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