广东工业大学蒋晓东的研究团队取得一项新突破。他们的最新研究探明了古新世—始新世极热时期赤道东太平洋中层水域铁肥化引起的脱氧作用。该研究于2024年2月5日发表于国际一流学术期刊《地质学》杂志上。

在这里，研究介绍了赤道东太平洋沉积物的磁性和地球化学分析结果。结果表明，在PETM期间，风成期和火山喷发产生的铁肥化促进了赤道东太平洋的生产力。这一过程导致中间水域中有机物降解和耗氧量增加，从而导致脱氧。研究结果表明，作为全球变暖的副作用，铁肥化可能是开阔海洋中氧气损失的重要驱动因素。

据研究人员介绍，古新世—始新世极热时期(PETM)是一个全球变暖的过渡时期，被认为是未来温室效应条件的重要模拟。它伴随着显著的碳循环扰动。尽管PETM的海洋脱氧现象已被广泛报道，但其在开放海洋中的机制仍不确定。

附：英文原文

Title: Iron fertilization–induced deoxygenation of eastern equatorial Pacific Ocean intermediate waters during the Paleocene–Eocene thermal maximum

Author: Xiaodong Jiang, Xiangyu Zhao, Xiaoming Sun, Andrew P. Roberts, Appy Sluijs, Yu-Min Chou, Weiqi Yao, Jieqi Xing, Weijie Zhang, Qingsong Liu

Issue&Volume: 2024-02-05

Abstract: The Paleocene–Eocene thermal maximum (PETM), a transient period of global warming, is considered to be an important analog for future greenhouse conditions. It was accompanied by a significant carbon cycle perturbation. Although ocean deoxygenation across the PETM is reported widely, its mechanism in the open ocean remains uncertain. Here, we present magnetic and geochemical analyses of sediments from the eastern equatorial Pacific Ocean. We found that iron fertilization during the PETM by eolian dust and volcanic eruptions fueled eastern equatorial Pacific Ocean productivity. This process led to increased organic matter degradation and oxygen consumption in intermediate waters, leading to deoxygenation. Our findings suggest that iron fertilization could be an important driver of open-ocean oxygen loss, as a side effect of global warming.

DOI: 10.1130/G51770.1

Source: https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G51770.1/633946/Iron-fertilization-induced-deoxygenation-ofredirectedFrom=fulltext