A contracting Intertropical Convergence Zone during the Early Heinrich Stadial 1

作者：Yiping Yang, Lanlan Zhang, Yi Liang, Fuchang Zhong, Zhengyao Lu, Sui Wan, Yan Du, Rong Xiang · 发表于：Nature Communications · 年份：2023 · DOI：10.1038/s41467-023-40377-9 · 被引用次数：22 · 研究领域：Geology and Paleoclimatology Research、Climate variability and models、Geomagnetism and Paleomagnetism Studies

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 δ 18 O seawater 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.