据了解，东亚冬季风(EAWM)活动对整个东亚和西太平洋的环境变化产生了深远的影响。第四纪EAWM的演化受到了广泛关注，但EAWM的长期波动特征及其驱动因素尚不清楚，特别是在全球气候和亚洲古地理发生显著变化的中新世晚期。
为了阐明晚中新世EAWM的演化，研究人员基于环境磁学、沉积学和地球化学的综合分析，建立了西北太平洋深海沉积物900万年EAWM的高精度叠加记录，揭示了晚中新世EAWM的强化。古气候模拟显示，与中亚造山带、青藏高原东北部隆升和南极冰盖扩张等因素相比，大气CO2下降对西北太平洋EAWM的增强起着至关重要的作用。
研究结果扩大了对从内陆地区到开阔海洋的EAWM演变的认识，并表明了大气CO2波动对过去大空间尺度上EAWM变化的重要性。
附：英文原文
Title: East Asian winter monsoon intensification over the Northwest Pacific Ocean driven by late Miocene atmospheric CO2 decline
Author: Qiang Zhang, Ran Zhang, Qingzhen Hao, Peter D. Clift, Andrew P. Roberts, Fabio Florindo, Qian Li, Jianxing Liu, Ze Liu, Ke Gui, Huizheng Che, Shuangchi Liu, Qingqing Qiao, Lixia Ju, Chunsheng Jin, Chuanzhou Liu, Qingsong Liu, Wenjiao Xiao, Zhengtang Guo
Issue&Volume: 2024-06-21
Abstract: East Asian winter monsoon (EAWM) activity has had profound effects on environmental change throughout East Asia and the western Pacific. Much attention has been paid to Quaternary EAWM evolution, while long-term EAWM fluctuation characteristics and drivers remain unclear, particularly during the late Miocene when marked global climate and Asian paleogeographic changes occurred. To clarify understanding of late Miocene EAWM evolution, we developed a high-precision 9-million-year-long stacked EAWM record from Northwest Pacific Ocean abyssal sediments based on environmental magnetism, sedimentology, and geochemistry, which reveals a strengthened late Miocene EAWM. Our paleoclimate simulations also indicate that atmospheric CO2 decline played a vital role in this EAWM intensification over the Northwest Pacific Ocean compared to other factors, including central Asian orogenic belt and northeastern Tibetan Plateau uplift and Antarctic ice-sheet expansion. Our results expand understanding of EAWM evolution from inland areas to the open ocean and indicate the importance of atmospheric CO2fluctuations on past EAWM variability over large spatial scales.
DOI: adm8270
Source: https://www.science.org/doi/10.1126/sciadv.adm8270