Anomalous widespread arid events in Asia over the past 550,000 years

Abstract

Records of element ratios obtained from the Maldives Inner Sea sediments provide a detailed view on how the Indian Monsoon System has varied at high-resolution time scales. Here, we present records from International Ocean Discovery Program (IODP) Site U1471 based on a refined chronology through the past 550,000 years. The record's high resolution and a proper approach to set the chronology allowed us to reconstruct changes in the Indian Monsoon System on a scale of anomalies and to verify their relationships with established records from the East Asian Monsoon System. On the basis of Fe/sum and Fe/Si records, it can be demonstrated that the Asia continental aridity tracks sea-level changes, while the intensity of winter monsoon winds responds to changes in Northern Hemisphere summer insolation. Furthermore, the anomalies of continental aridity and intensity of winter monsoon winds at millennial-scale events exhibit power in the precession band, nearly in antiphase with Northern Hemisphere summer insolation. These observations indicate that the insolation drove the anomalies in the Indian Summer Monsoon. The good correspondence between our record and the East Asian monsoon anomaly records suggests the occurrence of anomalous widespread arid events in Asia.

Description
Advisor
Degree
Type
Journal article
Keywords
Citation

Carrasqueira, I. G. da F., Jovane, L., Droxler, A. W., Alvarez Zarikian, C. A., Lanci, L., Alonso-Garcia, M., Laya, J. C., & Kroon, D. (2023). Anomalous widespread arid events in Asia over the past 550,000 years. PNAS Nexus, 2(6), pgad175. https://doi.org/10.1093/pnasnexus/pgad175

Has part(s)
Forms part of
Rights
Except where otherwise noted, this work is licensed under a Creative Commons Attribution (CC BY) license. Permission to reuse, publish, or reproduce the work beyond the terms of the license or beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.
Citable link to this page