Late Holocene diatom abundaces in sediment core HC-11

The study of diatoms in core HC11 collected from the southwestern part of Chukchi Sea, allowed to distinguish 3 diatoms ecological zones, reflecting paleoenvironmental changes during the last 2300 years. The sediment age was based on the sedimentation rates, determined by 210Pb and radiocarbon dating of mollusk shells. The environmental changes of Chukchi Sea revealed by examination of diatoms correlates with global climate changes - the warming of the early and middle Subatlantic and cooling of the late Subatlantic (Little Ice Age). Warming early and middle Subatlantic in the Chukchi Sea was probably stronger than the warming of the late 20th century and was not accompanied by significant changes in sea level.对采自楚科奇海西南部HC11岩芯的硅藻（diatoms）进行研究，可划分出3个硅藻生态带，这些生态带反映了过去2300年的古环境演变。沉积物年代学框架基于由210Pb测年与软体动物壳体放射性碳测年确定的沉积速率构建。通过硅藻分析揭示的楚科奇海环境变化与全球气候变化高度相关：亚大西洋期（Subatlantic）早中期发生升温，亚大西洋期晚期则出现降温（小冰期，Little Ice Age）。楚科奇海在亚大西洋期早中期的升温幅度可能高于20世纪晚期的升温幅度，且未伴随海平面的显著变化。