Response characteristics of high-resolution sedimentation and palynostratigraphy to paleoenvironmental changes in the coastal area of eastern Fujian during the MIS3—MIS1 period

To explore the response characteristics of sediments and ancient vegetation under the background of drastic climate and environmental changes, based on previous research, we provided more detailed sedimentary and pollen stratigraphic data from the MIS3 period to the early and middle stages of MIS1, reconstructed the sequence of ancient vegetation and sedimentary evolution, and discussed the relationship between ancient vegetation and sedimentary characteristics and climate and environmental evolution processes. Results show that the lithology of this section is mainly sandy silt and silty sand, and there are four sporopollen zones in each borehole, indicating different climate and environmental stages. In the transitional stage between early MIS3 and early-mid MIS1, marine dinoflagellate cysts and foraminiferal linings appeared. Comparative analyses in stratigraphy sedimentology, palynology, and global sea level and stalagmite ^δ18O curves showed significant fluctuations in the depositional environment of the Ningde coastal cores during the period from MIS3 to MIS1, which resulted in depositional discontinuities in different regions. The mid-MIS3 cooling indicated by sporo-pollen characteristics might be influenced by the H4 event, while H3 event responded to sedimentary characteristics, indicating that the environment in Ningde region was affected by the global climate and environmental changes, which was controlled by the glacial interglacial cycle driven by summer solar radiation in the northern hemisphere on a ten-thousand-year scale, and by the Asian monsoon and the Heinrich events on a thousand-year scale.