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A multi-proxy paleolimnological reconstruction of Holocene climate conditions in the Great Basin, United States

Published online by Cambridge University Press:  20 January 2017

Scott A. Reinemann ,
David F. Porinchu ,
Amy M. Bloom ,
Bryan G. Mark  and
Jason E. Box
Scott A. Reinemann*
Affiliation:
Department of Geography, The Ohio State University, Columbus, OH 43210, USA
David F. Porinchu
Affiliation:
Department of Geography, The Ohio State University, Columbus, OH 43210, USA
Amy M. Bloom
Affiliation:
Department of Geography–Geology, Illinois State University, Normal, IL 61790-4400, USA
Bryan G. Mark
Affiliation:
Department of Geography, The Ohio State University, Columbus, OH 43210, USA
Jason E. Box
Affiliation:
Department of Geography, The Ohio State University, Columbus, OH 43210, USA
*
⁎Corresponding author. Fax: +1 614 292 6213. E-mail address:[email protected] (S.A. Reinemann).
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Abstract

A sediment core spanning ∼ 7000 cal yr BP recovered from Stella Lake, a small sub-alpine lake located in Great Basin National Park, Nevada, was analyzed for subfossil chironomids (non-biting midges), diatoms, and organic content (estimated by loss-on-ignition (LOI)). Subfossil chironomid analysis indicates that Stella Lake was characterized by a warm, middle Holocene, followed by a cool “Neoglacial” period, with the last two millennia characterized by a return to warmer conditions. Throughout the majority of the core the Stella Lake diatom-community composition is dominated by small, periphytic taxa which are suggestive of shallow, cool, alkaline, oligotrophic waters with extensive seasonal ice cover. A reconstruction of mean July air temperature (MJAT) was developed by applying a midge-based inference model for MJAT (two-component WA-PLS) consisting of 79 lakes and 54 midge taxa (rjack2 = 0.55, RMSEP = 0.9°C). Comparison of the chironomid-inferred temperature record to existing regional paleoclimate reconstructions suggests that the midge-inferred temperatures correspond well to regional patterns. This multi-proxy record provides valuable insight into regional Holocene climate and environmental conditions by providing a quantitative reconstruction of peak Holocene warmth and aquatic ecosystem response to these changes in the Great Basin, a region projected to experience increased aridity and higher temperatures.

Keywords

Climate changeChironomidsDiatomsPaleolimnologyAlpinePaleoclimatologyHoloceneTemperaturewestern United StatesGreat BasinGreat Basin National Park
Type
Research Article
Information
Quaternary Research , Volume 72 , Issue 3 , November 2009 , pp. 347 - 358
Copyright
University of Washington

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