Turbulent transport of sea-spray in the coastal region

IF 4.5 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research Pub Date : 2024-11-07 DOI:10.1016/j.atmosres.2024.107769

Benjamin Luce , Isabelle Calmet , Boris Conan , Alexander M.J. Van Eijk

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Abstract

A realistic three-dimensionnal large-eddy simulation is performed for the study of turbulent transport of sea spray aerosol in the coastal region of Le Croisic, France. A new transport model for the aerosol is implemented in the ARPS code. Simulation results are compared with field measurements, both for the mean wind field and aerosol concentration. The numerical results fit well with the observations. The mean vertical concentration profile takes an exponential shape when the data is averaged over sufficiently long timeframe, whereas the 15-min averaged profiles vary and deviate from the theory. The transport of the aerosols is analyzed in relation to the sea-land transition and the changes in thermal stability of the atmosphere during the diurnal cycle. Turbulence is found to play an important role in the mixing of aerosols in the unstable surface layer. The turbulent vertical transport of aerosols is enhanced through convective cells over the land during the day, whereas, at night, aerosols remain trapped near the surface and are transported over appreciable horizontal distances under quasi-neutral or stable thermal conditions.

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沿海地区海雾的湍流输送

为研究法国勒克罗伊西克沿海地区海雾气溶胶的湍流输运，进行了逼真的三维大涡流模拟。ARPS 代码中采用了一种新的气溶胶传输模型。模拟结果与实地测量结果进行了比较，包括平均风场和气溶胶浓度。数值结果与观测结果非常吻合。在足够长的时间范围内对数据进行平均时，平均垂直浓度剖面呈指数形状，而 15 分钟平均剖面则各不相同，偏离了理论。分析了气溶胶的迁移与海陆过渡和昼夜周期大气热稳定性变化的关系。研究发现，湍流在不稳定表层气溶胶的混合过程中发挥了重要作用。气溶胶的湍流垂直输送在白天通过陆地上空的对流单元得到加强，而在夜间，气溶胶仍被困在地表附近，并在准中性或稳定的热条件下被输送到相当长的水平距离。

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来源期刊

Atmospheric Research 地学-气象与大气科学

CiteScore

9.40

自引率

10.90%

发文量

460

审稿时长

47 days

期刊介绍： The journal publishes scientific papers (research papers, review articles, letters and notes) dealing with the part of the atmosphere where meteorological events occur. Attention is given to all processes extending from the earth surface to the tropopause, but special emphasis continues to be devoted to the physics of clouds, mesoscale meteorology and air pollution, i.e. atmospheric aerosols; microphysical processes; cloud dynamics and thermodynamics; numerical simulation, climatology, climate change and weather modification.