Resolving seasonal rainfall changes in the Middle East during the last interglacial period

Citation

Material Information

Title:
Resolving seasonal rainfall changes in the Middle East during the last interglacial period
Series Title:
PNAS
Creator:
Orland, Ian J.
He, Feng
Bar-Matthews, Miryam
Chen, Guangshan
Ayalon, Avner
Kutzbach, John E.
Publication Date:
Language:
English

Subjects

Subjects / Keywords:
Paleoclimate ( local )
Seasonal-Resolution ( local )
Oxygen Isotopes ( local )
Data-Model Comparison ( local )
Genre:
serial ( sobekcm )

Notes

Abstract:
Paleorainfall proxy records from the Middle East have revealed remarkable patterns of variability since the penultimate glacial period (140 ka), but the seasonality of this signal has been unresolvable. Here, seasonal-resolution oxygen isotope data from Soreq Cave speleothems suggest that summer monsoon rainfall periodically reaches as far north as Israel—well removed from the modern monsoon—at times (∼125, 105 ka) that overlap with evidence for some of the earliest modern human migrations out of Africa. These seasonal proxy data are corroborated by seasonal-resolution model output of the amount and oxygen-isotope ratio of rainfall from an isotope-enabled climate model. In contrast to the modern regional climate where rainfall is delivered predominantly in winter months along westerly storm tracks, the model suggests that during extreme peaks of summer insolation—as occurs during the last interglacial (e.g., 125, 105 ka)—regional rainfall increases due to both wetter winters and the incursion of summer monsoons. This interpretation brings clarity to regional paleoproxy records and provides important environmental context along one potential pathway of early modern human migration.

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Source Institution:
University of South Florida Library
Holding Location:
University of South Florida
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This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.

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