A contracting Intertropical Convergence Zone during the Early Heinrich Stadial 1

Despite the fact that the response of tropical hydroclimate to North Atlantic cooling events during the Heinrich Stadial 1 (HS1) has been extensively studied in African, South American and Indonesia, the nature of such responses remains debated. Here we investigate the tropical hydroclimate pattern...

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Bibliographic Details
Published in:Nature Communications
Main Authors: Yang, Yiping, Zhang, Lanlan, Yi, Liang, Zhong, Fuchang, Lu, Zhengyao, Wan, Sui, Du, Yan, Xiang, Rong
Format: Article in Journal/Newspaper
Language:English
Published: Nature Publishing Group 2023
Subjects:
Climate Research
North Atlantic
Online Access:https://lup.lub.lu.se/record/1a2b2d20-2aab-449f-b477-a4cdc72f370d
https://doi.org/10.1038/s41467-023-40377-9
Description
Summary:Despite the fact that the response of tropical hydroclimate to North Atlantic cooling events during the Heinrich Stadial 1 (HS1) has been extensively studied in African, South American and Indonesia, the nature of such responses remains debated. Here we investigate the tropical hydroclimate pattern over the Indo-Asian-Australian monsoon region during the HS1 by integrating hydroclimatic records, and examining a δ18Oseawater record from Globigerinoides ruber (white) in the tropical Indian Ocean. Our findings indicate that tropical hydrological conditions were synchronously arid in both hemispheres during the early HS1 (~18.3-16.3 ka) in the Indo-Asian-Australian monsoon region, except for a narrow, wet hydrological belt in northern low latitudes, suggesting the existence of a contracted tropical precipitation belt at that time. This study reveals that the meltwater discharge and resulting changes in global temperatures and El Niño exerted a profound influence on the tropical hydroclimate in the Indo-Asian-Australian monsoon region during the early HS1.

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