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.

中文翻译：

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通过高分辨率观测评估北太平洋（亚）热带地区的 N2 固定通量及其控制因素

北太平洋（亚）热带西部地区可能是一个富含氮（N2）尽管对通量和控制因素的了解有限，但仍固定在全球海洋中。我们对该地区进行了2016年至2021年的高分辨率观测，并利用机器学习算法模拟了N个2固定通量。模型估计 N2固定通量从 5.72 到 6.45 Tg N yr−1，季节变化较大，夏季费率高峰。西北太平洋副热带环流和黑潮洋流对N的贡献较大2固定通量高于邻近区域。模型表明，海面温度、光合有效辐射和养分供应与氮的季节和空间变化密切相关。2固定。这项研究提供了 N 的改进估计2固定在北太平洋西部，并加深了我们对其在海洋生产力中的作用的理解。