A Lagrangian plankton model (LPM) is developed, in which the motion of a large number of Lagrangian particles, representing a parcel of plankton, is calculated under the turbulence field simulated by large‐eddy simulation. A spring phytoplankton bloom is realized using the LPM, and the mechanism for its 1 generation is investigated. The criterion based on these results is proposed as , where δ _E (= u _∗/f) is the scale for the Ekman boundary layer, δ _S (= ) is the scale for the depth of a seasonal thermocline, u _∗ is the wind stress, Q ₀ is the surface buoyancy flux, f is the Coriolis parameter, and C ₁ and C ₂ are constants. The critical depth hypothesis can be applied for the onset of a spring bloom, when , using the mixing layer depth instead of the mixed layer depth, as z _c  > C ₂ δ _S , but the critical turbulence hypothesis can be applied, as z _c  > C ₁ δ _E , when . A spring bloom is more likely to occur at higher latitudes, even if the atmospheric forcing is the same. The diurnal variation of Q ₀ tends to increase the strength of the spring bloom at small u _∗. Furthermore, various statistics of Lagrangian particles, such as the mixing length of plankton, the residence time of plankton within the euphotic zone, and the growth of plankton clarify the movement and growth of plankton cells.

中文翻译：

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拉格朗日浮游生物模型模拟的春季浮游植物绽放途径

建立了拉格朗日浮游生物模型（LPM），其中在大涡模拟所模拟的湍流场下，计算了代表拉格朗日小块的大量拉格朗日粒子的运动。使用LPM实现了春季浮游植物的开花，并研究了其第一代的机理。基于这些结果的准则被提议为，其中δ _È（= û _* / ˚F）是埃克曼边界层规模，δ_小号（= ）为季节性跃层的深度规模，ü _*是风应力Q ₀是表面浮力通量f 是科里奥利参数，C ₁和C ₂是常数。临界深度假设可以应用于一个弹簧开花的开始，当使用混合层深度而不是混合层深度，ž _ç  >  c ^ ₂ δ_小号，但是关键的湍流假说可以应用，如ž _Ç  >  c ^ ₁ δ _ê，当。即使大气强迫相同，在较高纬度下也更可能发生春季开花。Q ₀的昼夜变化趋向于增加春季开花的强度 u _∗。此外，拉格朗日粒子的各种统计数据，例如浮游生物的混合长度，浮游生物在富营养区中的停留时间以及浮游生物的生长阐明了浮游生物细胞的运动和生长。