A multi-proxy paleolimnological reconstruction of Holocene climate conditions in the Great Basin, United States |
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Authors: | Scott A Reinemann David F Porinchu Amy M Bloom Bryan G Mark Jason E Box |
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Institution: | aDepartment of Geography, The Ohio State University, Columbus, OH 43210, USA;bDepartment of Geography–Geology, Illinois State University, Normal, IL 61790-4400, USA |
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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. |
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Keywords: | Climate change Chironomids Diatoms Paleolimnology Alpine Paleoclimatology Holocene Temperature western United States Great Basin Great Basin National Park |
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