Changes in the relationship between temperature and precipitation during the Holocene recorded by the sediments of Yangying Co, eastern Tibetan Plateau

作者：Peiyao Xu, Duo Wu, Qili Xiao, Tao Wang, Shilong Guo, Jinghua Huang, Lili Pan, Mengjing Li · 发表于：Palaeogeography Palaeoclimatology Palaeoecology · 年份：2025 · DOI：10.1016/j.palaeo.2025.112937 · 被引用次数：5 · 研究领域：Geology and Paleoclimatology Research、Pleistocene-Era Hominins and Archaeology、Geological formations and processes

The Indian summer monsoon (ISM) is an important component of the Asian monsoon system. It transports moisture and heat from the ocean to mid- and low-latitude regions, which influence their climate and ecology. Under the influence of the Asian summer monsoon, temperature and precipitation in East Asia vary synchronously on the seasonal scale; however, this relationship was decoupled on the decadal scale over the past century, and on millennial or even longer time scales. In the context of the “Holocene temperature conundrum” and seasonal temperature reconstructions, the relationship between temperature and precipitation variations in the ISM region during the Holocene has been found to be increasingly complex. This study focuses on Yangying Co on Haizi Mountain, on the southeastern Tibetan Plateau . We obtained a high-quality, 475-cm-long, continuous sediment core (Yangying Co 2022B) from the lake center, which was dated using analyses of 137 Cs, 210 Pb, and AMS 14 C. After evaluating the carbon reservoir effect, a reliable chronology was established for this core since 15 ka (1 ka = 1000 years). Sedimentological proxies (grain size) and geochemical proxies (XRF elements, TOC , TN, organic matter content) were used to reconstruct the history of glacier activity during the last deglaciation , and temperature and precipitation changes during the Holocene. The changes in TOC, TN, organic matter content, and Br (reflecting biomass variations) reveal a gradual increase in biomass ...