Evidence for insolation and Pacific forcing of late glacial through Holocene climate in the Central Mojave Desert (Silver Lake, CA)

Autor: Andrea Arevalo, Jennifer Palermo, Matthew E. Kirby, Rosa Murrieta, Holly Eeg, Ricardo Lucero, Christine A. Hiner, Matthew S. Lachniet, William T. Anderson, Emily Silveira, Edward J. Knell
Rok vydání: 2015
Předmět:
Zdroj: Quaternary Research. 84:174-186
ISSN: 1096-0287
0033-5894
DOI: 10.1016/j.yqres.2015.07.003
Popis: 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.
Databáze: OpenAIRE
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