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南大洋植物浮游生物中铁压力增加的多十年趋势

Thomas J Ryan-Keogh¹, Sandy J Thomalla^1,2, Pedro M S Monteiro^1,3

¹Southern Ocean Carbon-Climate Observatory, CSIR, Cape Town 7700, South Africa.

Science (New York, N.Y.)

|February 23, 2023

概括

南洋的初级生产力正在下降, 这种在1996年至2022年期间观察到的趋势表明南大洋碳循环发生了重大变化.

科学领域:

海洋地质化学
海洋学
植物浮游生物生态

背景情况:

南洋的初级生产力主要受到光和铁的限制.
影响铁的可用性,可获得性和需求的确切因素仍然不清楚,使长期预测变得复杂.
了解这些动态对于预测南大洋碳循环的未来变化至关重要.

研究的目的:

分析南大洋植物浮游生物的多十年趋势.
研究铁应力与净初级生产之间的关系.
确定铁变压的驱动因素及其对碳循环的影响.

主要方法:

从生物地球化学Argo (BGC-Argo) 浮动器和船舶平台使用的历史现场数据集涵盖了1996-2022年.
分析了植物浮游生物的光生理学,特别是辐射正常化的非光化学火,作为铁应力的指标.
光生理学与区域净初级生产和混合层物理学的相关变化.

主要成果:

通过非光化学火的变化,发现了铁应力增加的多十年趋势.
与此同时,该地区的初级净产量也出现下降.
观察到越来越多的铁应力与南洋混合层物理和复杂的生态化学反有关.

结论:

南大洋的浮游生物正面临越来越多的铁缺乏.
这种越来越严重的铁力压力直接影响了区域的初级净产量.
这些发现表明南大洋碳循环正在发生重大变化,

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