近日，自然资源部第一海洋研究所石学法团队研究了近3万年多因素控制下鄂霍次克海海盆尺度环境演化。该研究于2025年11月4日发表在《中国科学：地球科学》杂志上。

鄂霍次克海位于东亚夏季风影响北缘，是现代北半球季节性海冰的最南边界及北太平洋中层水的通风源区，对全球气候变化的响应与反馈高度敏感，是研究环境变化的天然实验室。受单一研究材料限制，目前对该海域盆地尺度环境演化规律的认识仍显不足。

研究组整合鄂霍次克海30个站位的古环境记录，重新标定了这些岩芯的年代框架，据此重建了末次冰盛期以来（过去3万年）鄂霍次克海海表温度、海冰活动、表层生产力和中层水通风作用的盆地尺度演化历史，提出了海冰主导的“冰期型”与海冰-洋流共控的“间冰期型”两种环境演化模式。末次冰盛期（30–18 ka），研究区具有低海表温度、海冰扩张、中层水通风减弱和低表层生产力的特征；晚全新世（<6 ka）则呈现高海表温度、海冰退缩、中层水通风增强和高表层生产力，沉积物以硅质组分为主。

在Bølling-Allerød（14.7–12.9 ka）和Preboreal（11–9.7 ka）暖期，研究区海洋环境格局总体类似“间冰期型”，但中层水显著缺氧；而在Heinrich Stadial 1（18–15 ka）及新仙女木事件（12.9–11.7 ka）期间，海洋环境格局近似“冰期型”，但中层水通风作用增强。过去3万年来鄂霍次克海各环境要素的演化受外部强迫、内部反馈及高低纬度气候过程共同驱动。

附：英文原文

Title: Basin-scale environmental evolution in the Okhotsk Sea controlled by multiple factors over the past 30000 years

Author: Qingchao WANG, Jianjun ZOU, Xuguang FENG, Ruxi DOU, Zhi DONG, Aimei ZHU, Yanguang LIU, Xuefa SHI

Issue&Volume: 2025/11/04

Abstract: The Okhotsk Sea, located at the northern margin of the influence of the East Asian Summer Monsoon, is the southernmost boundary of the modern Northern Hemisphere seasonal sea-ice and a ventilation source of the North Pacific Intermediate Water. It is highly sensitive to the responses and feedbacks of global climate change, serving as a natural laboratory for investigating environmental changes. Due to limitations in individual research materials, our understanding of the basin-scale environmental evolution in the Okhotsk Sea remains insufficient. Here, we integrated paleoenvironmental records from 30 stations in the Okhotsk Sea and rephased the chronological scales of these cores. On this basis, we reconstructed the basin-scale evolutionary histories of sea surface temperature, sea-ice activity, surface productivity, and intermediate water ventilation in the Okhotsk Sea over the past 30 thousand years (kyr), and proposed two conceptual models of environmental evolution: the “glacial-type” dominated by sea ice and the “interglacial-type” co-dominated by sea ice and ocean currents. During the last glacial period (30–18kyr), the marine environment in the study area was characterized by low sea surface temperature, expanded sea ice, weak intermediate water ventilation, and low surface productivity. The late Holocene (<6kyr) exhibited high sea surface temperature, retreated sea ice, strong intermediate water ventilation, and high surface productivity, with sediments dominated by siliceous components. During the Blling-Allerd (BA, 14.7–12.9kyr) and Preboreal (11–9.7kyr) warm periods, the marine environmental pattern in the study area was generally similar to the “interglacial-type”, but the intermediate water was significantly hypoxic. During Heinrich Stadial 1 (HS1, 18–15kyr) and the Younger Dryas (YD, 12.9–11.7kyr), the marine environmental pattern was similar to the “glacial-type”, but with enhanced intermediate water ventilation. The evolution of environmental elements in the Okhotsk Sea over the past 30kyr has been jointly shaped by external forcings, internal feedbacks, and climate processes in high and low latitudes.

DOI: 10.1007/s11430-024-1700-y

Source: https://www.sciengine.com/SCES/doi/10.1007/s11430-024-1700-y