Assessing N2 fixation flux and its controlling factors in the (sub)tropical western North Pacific through high‐resolution observations

IF 5.1 2区地球科学 Q1 LIMNOLOGY

Limnology and Oceanography Letters Pub Date : 2024-05-03 DOI:10.1002/lol2.10404

Xinran Yu, Zuozhu Wen, Ruotong Jiang, Jin‐Yu Terence Yang, Zhimian Cao, Haizheng Hong, Yuntao Zhou, Dalin Shi

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引用次数: 0

Abstract

The (sub)tropical western North Pacific is potentially an area of intense nitrogen (N2) fixation in the global ocean, despite limited understanding of the flux and controlling factors. We conducted high‐resolution observations from 2016 to 2021 in this region and used machine learning algorithms to simulate N2 fixation flux. Models estimated an N2 fixation flux from 5.72 to 6.45 Tg N yr−1, with strong seasonal variation and peak rates in summer. The western North Pacific Subtropical Gyre and the Kuroshio Current contributed more to N2 fixation flux than did the adjacent areas. Models suggested that sea surface temperature, photosynthetically available radiation, and nutrient supply were most strongly correlated with seasonal and spatial variations in N2 fixation. This study provides an improved estimation of N2 fixation in the western North Pacific and advances our understanding of its role in ocean productivity.

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通过高分辨率观测评估（亚）热带北太平洋西部的 N2 固定通量及其控制因素

尽管对氮通量和控制因素的了解有限，但（亚）热带北太平洋西部可能是全球海洋氮（N2）强化固定的区域。我们从 2016 年到 2021 年对这一区域进行了高分辨率观测，并使用机器学习算法模拟 N2 固定通量。模型估计的 N2 固定通量为 5.72-6.45 Tg N yr-1，具有很强的季节性变化，夏季达到峰值。北太平洋西部亚热带环流和黑潮对 N2 固定通量的贡献大于邻近地区。模型表明，海面温度、光合可用辐射和营养供应与 N2 固定的季节和空间变化关系最为密切。这项研究改进了对北太平洋西部 N2 固定的估计，并加深了我们对其在海洋生产力中作用的理解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Limnology and Oceanography Letters Multiple-

CiteScore

10.00

自引率

3.80%

发文量

审稿时长

25 weeks

期刊介绍： Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.