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Late holocene environmental changes in the Southwestern Chukchi Sea inferred from diatom analysis

机译:根据硅藻分析推断楚科奇海西南部全新世晚期环境变化

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摘要

The environmental changes in the southern part of the Chukchi Sea over the last 2300 years (two warmings during the 262 BC-630 AD and 630-1300 periods AD and 1 cooling 1300-1840 AD) were inferred from changes in the content of diatoms in sediments (per gram), the ratio of dominant species, and the ecological structure of diatom assemblages. The sediment age was determined based on the recent Pb-210 sedimentation rates at the sampling point (0.43 mm/yr) and radiocarbon dating of mollusk shells. The environmental changes in the southern Chukchi Sea that were inferred from the diatom analysis correlate with global climate changes, viz., the warming events of the early (Roman) and the middle (Medieval) Subatlantic and the cooling of the late (Little Ice Age) Subatlantic.
机译:根据楚科奇海南部过去2300年的环境变化(公元前262年至630年和公元630-1300年两次升温,以及1300年至1840年的一次降温)推断出楚科奇海南部的硅藻含量发生了变化。沉积物(每克),优势种的比率以及硅藻组合的生态结构。根据最近在采样点的Pb-210沉积速率(0.43 mm / yr)和软体动物壳的放射性碳测年来确定沉积物的年龄。通过硅藻分析推断出的楚科奇海南部的环境变化与全球气候变化有关,即早大西洋(罗马)和中大西洋(中世纪)的变暖事件以及晚期(小冰河时期)的降温。 )。

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