Major lake level fluctuations and climate changes for the past 16,000 years as reflected by diatoms and chironomids preserved in the sediment of Laguna Potrok Aike, southern Patagonia

QUATERNARY SCIENCE REVIEWS

卷:71

Article

Massaferro, J.¹  Recasens, C.²  Larocque-Tobler, I.³  Zolitschka, B.⁵  Maidana, N. I.⁴ 

[1] Consejo Nacl Invest Cient & Tecn, CENAC, APN, San Carlos De Bariloche, Rio Negro, Argentina

[2] Univ Geneva, Dept Geol & Paleontol, CH-1211 Geneva, Switzerland

[3] LimnoPaleoServ, Lyss, Switzerland

[4] Univ Buenos Aires, CONICET, DBBE FCEN, Buenos Aires, DF, Argentina

[5] Univ Bremen, Inst Geog, GEOPOLAR, D-28359 Bremen, Germany

关键词: Diatoms;    Chironomids;    Paleoclimatic reconstruction;    Lateglacial;    Holocene;   

DOI  :  10.1016/j.quascirev.2012.07.026

来源: Elsevier

【 摘 要 】

Laguna Potrok Aike is a maar lake located in southernmost Argentina and is one of the few permanent lakes preserving a continuous climatic record from the semiarid Patagonian steppe. Furthermore, its location close to Antarctica provides a unique opportunity to compare paleoclimate from continental South America with the polar records. The analysis of subfossil chironomids and diatoms throughout a 16-m sedimentary record retrieved from this lake, combined with a well-constrained chronology of the last ca 16 ka BP, provided a high resolution paleoenvironmental reconstruction of the limnology of the lake and regional climate conditions. The combination of both bioproxies showed humid conditions during the Lateglacial, followed by drier conditions during the Holocene, resulting in large variations in lake level. Despite not showing a clear evidence of a cold reversal similar to the Antarctic Cold Reversal and/or the Younger Dryas, both records suggest high water levels and oligotrophic conditions between 16.4 and 11.5 cal. ka BP. The lake level drop that occurred at ca 8.7 ka BP is well documented by both bioproxies. (c) 2012 Elsevier Ltd. All rights reserved.

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