Northern Hemisphere Summer Insolation and Ice Volume Driven Variations in Hydrological Environment in Southwest China

作者：Yao Wu, Sophie Warken, Norbert Frank, Aaron Mielke, Chao‐Jun Chen, Jun‐Yun Li, Ting‐Yong Li · 发表于：Geophysical Research Letters · 年份：2023 · DOI：10.1029/2023gl105664 · 被引用次数：22 · 研究领域：Geology and Paleoclimatology Research、Geological formations and processes、Methane Hydrates and Related Phenomena

Abstract The interpretation of stalagmite δ 18 O in terms of reflecting Asian summer monsoon (ASM) precipitation is still elusive. Here, we present high‐resolution stalagmite trace element ratios (X/Ca, X = Mg, Sr, Ba) records from southwest China covering 116.09 to 4.07 ka BP. δ 18 O, δ 13 C, and X/Ca values exhibit clear precessional cycles, with δ 18 O values reflecting ASM circulation/intensity, while X/Ca ratios capture local precipitation or evapotranspiration variations. Our results show that Northern Hemisphere summer insolation (NHSI) is the main driver of ASM intensity and precipitation phase variation, but global ice volume modulates the response magnitude of summer precipitation to insolation. During the Last Glacial Maximum, high ice volumes caused significant monsoon precipitation to decrease. In contrast to modern observations of the tripolar distribution of precipitation in China, our record is consistent with paleo‐precipitation records in southern and northern China.