Jet stream poleward migration leads to marine primary production decrease

Júlia Crespin

doi:10.1016/j.pocean.2025.103494

2025-07-01

Júlia Crespin *

Jordi Solé

Miquel Canals

DOI：10.1016/j.pocean.2025.103494

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急流（JS）是强大的对流层上部风，对天气和气候产生显著影响。随着人为气候变化改变温度梯度，副热带JS预计将向极地方向移动，这可能对中纬度地球系统产生不可预见的后果。在此，我们首次展示了北半球副热带JS稳定向极地方向迁移对海洋初级生产力（MPP）的影响。利用超过二十年的数据（2000-2023年），我们确立了JS纬度位置与西北地中海MPP变率之间的直接关系。研究期间观测到的约75公里的北向迁移与叶绿素浓度持续下降一致，降幅达40%，年降幅最高达-5%。这归因于JS位置的稳定北向季节性移动，它驱动了北部风应力与埃克曼泵送的变化，进而减少了上升流的频率和强度。尽管JS位置对MPP的主要影响是季节性的，但我们的研究证明其影响也延伸至非季节性组分。与将JS移动与短期风应力变化和孤立上升流事件联系起来的其他研究不同，我们的发现强调了其对MPP的长期影响。我们的发现表明，JS动力学是西北地中海MPP变率的主导驱动因素，并指出其他全球海洋区域存在类似情况。MPP减少的级联效应有可能显著影响海洋生态系统和资源，对渔业和碳循环产生更广泛的影响。

Keyword:

Jet Stream 1

Marine Primary Production 2

Atmosphere-Ocean Interactions 3

Climate Change 4

Climate Change Impacts 5

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