东南波罗的海近千年环境条件重建
DOI:
https://doi.org/10.29006/1564-2291.JOR-2025.53(4).9关键词:
X射线荧光分析, 短沉积柱样, 中世纪气候适宜期, 现代增温期, 缺氧, 富营养化摘要
通过使用密封式小型取样管在格但斯克海盆和哥特兰海盆斜坡获取的三根短沉积柱样，重建了波罗的海 近1000年来的古环境状况。研究显示，在表面生产力均较高的两个温暖气候时期——中世纪气候适宜期 与现代增温期，其底层水体的氧环境存在显著差异。 在中世纪气候适宜期，人类活动影响低于现代，自然气候变异对海域生态系统具有重要影响。频繁流入 的富氧北海水体有效阻止了底层缺氧的发展。而在现代增温期，人为源营养盐过量输入加速了富营养化 进程，同时北海水体入侵的频率和规模下降，共同导致了广泛缺氧现象的发展。在较冷的小冰期，尽管水 体入侵减少，但生产力下降保证了底层水体的充分氧饱和。
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2025-12-21
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海洋地质学、地球物理学与地球化学
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