本文研究了过去280个千万年(kyr)期间轨道尺度的ASM动态及其对早期H. sapiens向东亚疏散的可能影响，通过独特的整合数据，包括：1)来自中国黄土高原新的百年分辨率ASM记录，2)基于模型的东亚水文气候重建，3)古人类资料汇编，和4)全球H. sapiens栖息地适宜性模拟。研究基于代理和模式的综合重建表明，ASM降水对北半球冰量、温室气体和区域夏季日照作用力的综合响应，伴随着约100-kyr、41-kyr，和20-kyr的主要轨道周期。
在大约125-70kyr前，夏季季风降雨和温度在亚洲大部分地区呈现上升趋势。这一事件与东亚多个地方的发现的最早的H. sapiens化石相吻合。随着模拟栖息地适宜性的跨洲增加，研究人员认为，在末次间冰期，ASM的加强和东南非洲气候的恶化可能促进了最初的H. sapiens从其非洲的家园向遥远的东亚的疏散。
据介绍，由于缺乏对亚洲古人类和古气候数据的协调综合，早期Homo sapiens从非洲到东亚的疏散与亚洲夏季风(ASM)的轨道演变(目前最大的季风系统)，之间的关系仍未得到充分的探索。
附：英文原文
Title: Concurrent Asian monsoon strengthening and early modern human dispersal to East Asia during the last interglacial
Author: Ao, Hong, Ruan, Jiaoyang, Martinón-Torres, María, Krapp, Mario, Liebrand, Diederik, Dekkers, Mark J., Caley, Thibaut, Jonell, Tara N., Zhu, Zongmin, Huang, Chunju, Li, Xinxia, Zhang, Ziyun, Sun, Qiang, Yang, Pingguo, Jiang, Jiali, Li, Xinzhou, Xie, Xiaoxun, Song, Yougui, Qiang, Xiaoke, Zhang, Peng, An, Zhisheng
Issue&Volume: 2024-1-8
Abstract: The relationship between initial Homo sapiens dispersal from Africa to East Asia and the orbitally paced evolution of the Asian summer monsoon (ASM)—currently the largest monsoon system—remains underexplored due to lack of coordinated synthesis of both Asian paleoanthropological and paleoclimatic data. Here, we investigate orbital-scale ASM dynamics during the last 280 thousand years (kyr) and their likely influences on early H. sapiens dispersal to East Asia, through a unique integration of i) new centennial-resolution ASM records from the Chinese Loess Plateau, ii) model-based East Asian hydroclimatic reconstructions, iii) paleoanthropological data compilations, and iv) global H. sapiens habitat suitability simulations. Our combined proxy- and model-based reconstructions suggest that ASM precipitation responded to a combination of Northern Hemisphere ice volume, greenhouse gas, and regional summer insolation forcing, with cooccurring primary orbital cycles of ~100-kyr, 41-kyr, and ~20-kyr. Between ~125 and 70 kyr ago, summer monsoon rains and temperatures increased in vast areas across Asia. This episode coincides with the earliest H. sapiens fossil occurrence at multiple localities in East Asia. Following the transcontinental increase in simulated habitat suitability, we suggest that ASM strengthening together with Southeast African climate deterioration may have promoted the initial H. sapiens dispersal from their African homeland to remote East Asia during the last interglacial.
DOI: 10.1073/pnas.2308994121
Source: https://www.pnas.org/doi/abs/10.1073/pnas.2308994121