Journal
QUATERNARY RESEARCH
Volume 84, Issue 2, Pages 174-186Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1016/j.yqres.2015.07.003
Keywords
Mojave Desert Silver Lake; Holocene; Late Glacial; Sediments; Insolation; Sea-surface temperatures; Monsoon; Pluvial; Drought; Pacific
Funding
- CSUF Junior/Senior Mini Grant
- National Science Foundation STEP Program [0757113]
- Department of Education STEM2 Grant [P031C110116]
- Div Atmospheric & Geospace Sciences
- Directorate For Geosciences [1405546] Funding Source: National Science Foundation
- Division Of Undergraduate Education
- Direct For Education and Human Resources [0757113] Funding Source: National Science Foundation
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Silver Lake is the modern terminal playa of the Mojave River in southern California (USA). As a result, it is well located to record both influences from the winter precipitation dominated San Bernardino Mountains - the source of the Mojave River - and from the late summer to early fall North American monsoon at Silver Lake. Here, we present various physical, chemical and biological data from a new radiocarbon-dated, 8.2 m sediment core taken from Silver Lake that spans modern through 14.8 cal ka BP. Texturally, the core varies between sandy clay, clayey sand, and sand-silt-clay, often with abrupt sedimentological transitions. These grain-size changes are used to divide the core into six lake status intervals over the past 14.8 cal ka BP. Notable intervals include a dry Younger Dryas chronozone, a wet early Holocene terminating 7.8 - 7.4 cal ka BP, a distinct mid-Holocene arid interval, and a late Holocene return to ephemeral lake conditions. A comparison to potential climatic forcings implicates a combination of changing summer - winter insolation and tropical and N Pacific sea-surface temperature dynamics as the primary drivers of Holocene climate in the central Mojave Desert. (C) 2015 University of Washington. Published by Elsevier Inc. All rights reserved.
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