Abstract
Abstract The Yellow River Delta adjacent to the Bohai Sea is located in the monsoon region of northern China, which is sensitive to global climate change. The core data of KY-01 borehole in the Yellow River Delta and the published records were used to reconstruct the climate environment. Based on the analysis of carbonate content, magnetic susceptibility, Ostracoda, foraminifera, sporopollenin and AMS 14C dating on the KY-01 borehole sediment core, the evolution of both the climate and sedimentary environment has been discussed. The results show that: 7656–4145 cal.aBP, seawater moved toward the land surface and the climate was generally warm and humid, when there were small-scale extreme climate fluctuations; 4145–2544 cal.aBP, transgression and recession occurred, the climate changed from warm-wet to dry-cold and there were small-scale extreme climatic events; and 2544 cal.aBP–1855 AD, the sea level was relatively low, transgression and retreat alternately occurred, the climate was drier and colder than the previous stage and the warming and cooling alternated. During the middle Holocene, cold-dry events occurred between 5737–5422 and 4451–4081 cal.aBP, which is consistent with both Chinese and worldwide climate records.
Highlights
Holocene is an important geological period in geology, known as the post-glacial period
Due to the comprehensive influence of solar radiation, atmospheric circulation, physical and geographical environments in different regions, the climate change in different regions has its own characteristics since Holocene, and there are some differences among regions, so the regional research of Holocene climate change is worthy of attention
To establish a time series for the Yellow River Delta, two samples selected from depths of 1,850 and 2,085 cm in the KY-01 sediment core were used as test materials for 14C dating (Table 1)
Summary
Holocene is an important geological period in geology, known as the post-glacial period It is a geological period most affected by human activities and closely related to human evolution and development. In terms of research methods of environmental proxy indicators, Zhu used a variety of proxy indicators to reveal the important role of climate change and natural disasters such as floods and transgressions in cultural evolution (interruption, extinction) since the mid-Holocen (Zhu et al 2006). In the application of new technical means, the emergence of analysis methods, such as stalagmite record (Huang et al 2019), Phytolith record (Zhang et al 2019), bone carbon/hydrogen/oxygen isotope (Ma et al 2019) and biological mitochondrial DNA (Railsback 2018), provided more perfect ideas for the study of climate and environmental changes
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