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Lagrangian fronts and saury catch locations in the Northwestern Pacific in 2004–2019
Journal of Marine Systems ( IF 2.8 ) Pub Date : 2021-06-17 , DOI: 10.1016/j.jmarsys.2021.103605
S.V. Prants , M.V. Budyansky , M.Yu. Uleysky , V.V. Kulik

A database with Pacific saury catch locations in 2004–2019 fishing seasons in the region of the Kuril and Hokkaido islands was created to study a connection of favorable fishing grounds with mesoscale fronts in the area. The locations of the fronts have been identified with the help of daily altimetry-based Lagrangian maps computed for a large number of artificial particles. Based on the Lagrangian analysis of the multi-year simulation results, we distinguished persistent Lagrangian fronts with accumulation of catches, which were associated with the Soya Warm Current, the 1st, 2nd and 3rd Oyashio branches and with quasi-stationary Hokkaido and Bussol anticyclones. The simulated Lagrangian fronts, which are accessible practically in the real time, have been shown to be useful proxies for locations of hydrological fronts with potential fishing grounds. The proximity of catch sites to locations of strong Lagrangian fronts has been shown statistically using the maximal gradients of the Lyapunov field as an indicator of fronts. The origin maps have been used for analysis of interannual variation in the spatial distribution of the nutrient-rich Oyashio and Okhotsk Sea water masses. Calculating surface Oyashio transport in the altimetry era, we connected the catastrophic decrease in saury catches in traditional fishing places in 2015–2019 with a change in the pathways of the Oyashio water. The significant increase of the Oyashio transport in the recent years was supposed to be favorable for formation of potential fishing grounds far east off Kurils and Hokkaido coasts. This factor together with a smaller stock-size saury immigration was supposed to explain a decrease in the actual catches after 2014 and a displacement of the fishing grounds to the open ocean.



中文翻译:

2004-2019 年西北太平洋拉格朗日锋和秋刀鱼捕捞地点

创建了一个包含千岛群岛和北海道群岛地区 2004-2019 年捕鱼季节太平洋刀鱼捕捞地点的数据库,以研究有利渔场与该地区中尺度锋的联系。前沿的位置已在每日测高的拉格朗日地图的帮助下确定,该地图为大量人工粒子计算。基于多年模拟结果的拉格朗日分析,我们区分了与大豆暖流、第 1、2 和 3 亲潮分支以及准静止的北海道和 Bussol 反气旋相关的持续性拉格朗日锋,并具有捕获量的积累。模拟的拉格朗日前沿,几乎可以实时访问,已被证明是具有潜在渔场的水文前沿位置的有用代理。使用 Lyapunov 场的最大梯度作为锋面的指标,已在统计上显示了捕获点与强拉格朗日锋面位置的接近程度。原点图已用于分析富含营养的亲潮和鄂霍次克海水团空间分布的年际变化。计算测高时代的表面亲潮传输,我们将 2015-2019 年传统捕鱼场所秋刀鱼捕获量的灾难性减少与亲潮水路径的变化联系起来。近年来亲潮运输的显着增加被认为有利于在远东千岛群岛和北海道海岸形成潜在渔场。

更新日期:2021-06-19
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