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Runoff- and monsoon-driven variability of fish production in East China Seas

机译：东海鱼类产量的径流和季风驱动变化

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摘要

To understand the confounding fishing effect and physical influence on fish production, catch time series in the East China Seas were analyzed. Principal component analysis partitioned 18 catch time series into interannual trends and variations. While the trends were attributed to growth in fishing effort, variations in catches were related to precipitation and monsoon wind speed. Correlations of catch variations with the physical variables suggest that land-based runoff and monsoon circulation of the diluted coastal water masses are the physical forces dominating catch variability and the influences are largely through the associated nutrient supply on primary production. Runoff inputs nutrients to the coastal ecosystem, while monsoons drive their distribution. Offshore diffusion of the coastal water masses by the summer monsoon increases distribution and efficiency of nutrients and has a positive effect on fish production. Southerly transport of coastal currents alongshore by the winter monsoon confines nutrient distribution and induces nutrient loss from the northern waters. This process reduces overall and northern production, but increases production to the south. A long-term variation in catches was identified, which corresponds to a trend in the local winter monsoon as well as large-scale atmospheric changes. Prediction of the catch variation by the local wind speed suggests that large-scale atmospheric circulation determines the trend in the local winter monsoon, and the local winter monsoon that drives nutrient distribution should be directly responsible for the long-term variation of fish production in the East China Seas.
机译：为了了解混杂的捕捞效果和物理影响对鱼类生产的影响，分析了东海捕捞时间序列。主成分分析将18个捕获时间序列划分为年际趋势和变化。虽然趋势归因于捕捞努力的增加，但渔获量的变化与降水和季风风速有关。渔获量变化与物理变量的相关性表明，稀释后的沿海水团的陆基径流和季风环流是支配渔获量变化的物理力，其影响主要是通过相关的养分供应对初级生产造成的。径流将营养物输入沿海生态系统，而季风则驱动其分布。夏季风使沿海水团在海上扩散，增加了养分的分布和效率，对鱼类生产产生了积极影响。冬季季风使沿海水流向南向南运输，限制了养分分布并导致养分从北部水域流失。此过程减少了北部和北部的总产量，但增加了南部的产量。确定了渔获量的长期变化，这与当地冬季风和大范围大气变化的趋势相对应。根据当地风速对渔获量变化的预测表明，大规模的大气环流决定了当地冬季季风的趋势，而驱动营养成分分布的当地冬季季风应该直接导致该地区鱼类产量的长期变化。东海。

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