Nature Communications (Aug 2023)

A contracting Intertropical Convergence Zone during the Early Heinrich Stadial 1

  • Yiping Yang,
  • Lanlan Zhang,
  • Liang Yi,
  • Fuchang Zhong,
  • Zhengyao Lu,
  • Sui Wan,
  • Yan Du,
  • Rong Xiang

DOI
https://doi.org/10.1038/s41467-023-40377-9
Journal volume & issue
Vol. 14, no. 1
pp. 1 – 8

Abstract

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Abstract 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.