Activation of a small ephemeral lake in southern Jordan during the last full glacial period and its paleoclimatic implications

Quaternary Research
By: , and 

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Abstract

Playas, or ephemeral lakes, are one of the most common depositional environments in arid and semiarid lands worldwide. Playa deposits, however, have mostly been avoided as paleoclimatic archives because they typically contain exceptionally low concentrations of organic material, making 14C dating difficult. Here, we describe a technique for concentrating organic matter in sediments for radiocarbon dating and apply it to playa sediments recovered from a 2.35m sediment core from a small playa in southern Jordan. Based on 14C ages of the organic concentrate fraction, the playa was active from ~29 to 21 ka, coincident with the last major high stand of Paleolake Lisan and wet conditions recorded by other paleoclimatic proxies in the southernmost Levant during the last full glacial period (35–20 ka). The timing and spatial pattern of these records suggests that the increased moisture was likely derived from more frequent and deeper eastern Mediterranean (EM) cyclones associated with the intensification of the westerlies. The presence of full glacial pluvial deposits in southern Jordan (29°N), and the lack of similarly aged deposits in the northern Arabian Peninsula to the south, suggests that the southerly limit of the incursion of EM cyclones during last full glacial period was ~28°N.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Activation of a small ephemeral lake in southern Jordan during the last full glacial period and its paleoclimatic implications
Series title Quaternary Research
DOI 10.1017/qua.2017.29
Volume 88
Issue 1
Year Published 2017
Language English
Publisher Cambridge University Press
Contributing office(s) Geosciences and Environmental Change Science Center
Description 12 p.
First page 98
Last page 109
Country Jordan
Other Geospatial Khabrat Ratiya