Most pollen analysis in Korea has focused on the Holocene Epoch, because pre-last glacial maximum terrestrial archives suitable for palynological study in the Korean Peninsula are limited. Thus, to verify the responses of vegetation to climate changes over the orbital timescales, analysis of pollen in marine sediments is needed. Here, we present the pollen record of hemipelagic sediments of core DD09-ST21 obtained from the northern Ulleung Basin in the East Sea. The palynofloral assemblages were dominated by warm temperate broadleaved trees and boreal conifers during interglacial and glacial periods, respectively. We also demonstrated that bisaccate pollen and herbaceous pollen in the palynological sequence can be used as indicators of the variation in the East Asian winter monsoon (EAWM) intensity during the last glacial period and freshwater inflow into the East Sea, respectively. During glacial periods, the EAWM intensified in response to weakening of the summer insolation at 60° N, while freshwater influx into the East Sea decreased due to a decrease in precipitation.

韩国的大多数花粉分析都集中在全新世，因为适合朝鲜半岛孢粉学研究的前冰期最大陆生档案数量有限。因此，为了验证植被在轨道时间尺度上对气候变化的响应，需要分析海洋沉积物中的花粉。在这里，我们介绍了从东海北部Ulleung盆地获得的DD09-ST21岩心的半海岸沉积物的花粉记录。在冰间期和冰川期，古植物群主要由温带温带阔叶树和针叶树组成。我们还证明了在孢粉学序列中的双针状花粉和草本花粉可以分别用作最后一次冰川期东亚冬季风（EAWM）强度变化和淡水流入东海的指标。在冰川期，由于夏季在60°N的日照减弱，EAWM加剧，而由于降水减少，流入东海的淡水减少了。