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Ship plume dispersion rates in convective boundary layers for chemistry models

机译：化学模型对流边界层中船羽的扩散速率

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Detailed ship plume simulations in various convective boundary layersituations have been performed using a Lagrangian Dispersion Model driven bya Large Eddy Simulation Model. The simulations focus on the early stage (1–2 h)of plume dispersion regime and take into account the effects of plumerise on dispersion. Results are presented in an attempt to provide toatmospheric chemistry modellers a realistic description of characteristicdispersion impact on exhaust ship plume chemistry. Plume dispersionsimulations are used to derive analytical dilution rate functions. Eventhough results exhibit striking effects of plume rise parameter ondispersion patterns, it is shown that initial buoyancy fluxes at ship stackhave a minor effect on plume dilution rate. After initial high dispersionregimes a simple characteristic dilution time scale can be used toparameterize the subgrid plume dilution effect in large-scale chemistrymodels. The results show that this parameter is directly related to thetypical turn-over time scale of the convective boundary layer.
机译：已经使用由大涡流仿真模型驱动的拉格朗日色散模型对各种对流边界层位置中的船羽进行了详细的仿真。模拟着重于羽流弥散状态的早期阶段（1-2小时），并考虑了羽状流对弥散的影响。提出结果以试图为大气化学建模者提供对特征分散对排气船羽流化学影响的现实描述。羽流分散模拟用于得出分析稀释率函数。尽管结果显示出羽流上升参数对分散模式的显着影响，但结果表明，船舶堆叠处的初始浮力通量对羽流稀释率的影响较小。在最初的高分散体系之后，可以使用简单的特征稀释时间尺度来参数化大型化学模型中亚网格羽流稀释效果。结果表明，该参数与对流边界层的典型周转时间尺度直接相关。

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