Desert wetlands record hydrologic variability within the Younger Dryas chronozone, Mojave Desert, USA

Quaternary Research
By: , and 

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Abstract

One of the enduring questions in the field of paleohydrology is how quickly desert wetland ecosystems responded to past episodes of abrupt climate change. Recent investigations in the Las Vegas Valley of southern Nevada have revealed that wetlands expanded and contracted on millennial and sub-millennial timescales in response to changes in climate during the late Quaternary. Here, we evaluate geologic evidence from multiple localities in the Mojave Desert and southern Great Basin that suggests the response of wetland systems to climate change is even faster, occurring at centennial, and possibly decadal, timescales. Paleowetland deposits at Dove Springs Wash, Mesquite Springs, and Little Dixie Wash, California, contain evidence of multiple wet and dry cycles in the form of organic-rich black mats, representing periods of past groundwater discharge and wet conditions, interbedded with colluvial, alluvial, and aeolian sediments, each representing dry conditions. Many of these wet-dry cycles date to within the Younger Dryas (YD) chronozone (12.9–11.7 ka), marking the first time intra-YD hydrologic variability has been documented in paleowetland deposits. Our results illustrate that desert wetland ecosystems are exceptionally sensitive to climate change and respond to climatic perturbations on timescales that are relevant to human society.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Desert wetlands record hydrologic variability within the Younger Dryas chronozone, Mojave Desert, USA
Series title Quaternary Research
DOI 10.1017/qua.2018.14
Edition Online First
Year Published 2018
Language English
Publisher Cambridge University Press
Contributing office(s) Geosciences and Environmental Change Science Center
Description 12 p.
First page 1
Last page 12
Country United States
Other Geospatial Mojave Desert