峡湾
冰川
海洋学
北极的
环境科学
硅藻
气候变化
全球变暖
总有机碳
沉积物
地质学
自然地理学
生态学
地理
生物
地貌学
作者
Fu-Tao Fang,⎜Zhuoyi Zhu,Fred Wenger,Jianzhong Ge,Jinzhou Du,Bing Deng,Hongmei Ma,Ruifeng Zhang,Yukui Zhang
标识
DOI:10.1016/j.scitotenv.2024.175757
摘要
Arctic fjords are hotspots of marine carbon burial, with diatoms playing an essential role in the biological carbon pump. Under the background of global warming, the proportion of diatoms in total phytoplankton communities has been declining in many high-latitude fjords due to increased turbidity and oligotrophication resulting from glacier melting. However, due to the habitat heterogeneity among Svalbard fjords, diatom responses to glacier melting are also expected to be complex, which will further lead to changes in the biological carbon pumping and carbon sequestration. To address the complexity, three short sediment cores were collected from three contrasting fjords in Svalbard (Krossfjorden, Kongsfjorden, Gronfjorden), recording the history of fjord changes in recent decades during significant glacier melting. The amino acid molecular indicators in cores K4 and KF1 suggested similar organic matter degradation states between these two sites. In contrast to the turbid Kongsfjorden and Gronfjorden, preserved fucoxanthin in Krossfjorden indicated a continuous increase in diatoms since the mid-1980s, corresponding to a 59 % increase in biological carbon pumping, as quantified by the δ
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