Abstract Soil deposition is an essential pathway for tropospheric ozone (O3) removal, but its controlling factors remain unclear. Here, we explored the variability of soil O3 resistance in response to soil texture. To this aim, data of O3 deposition over bare soil obtained from micrometeorological measurements under contrasted meteorological conditions for five sites were used. The results obtained are twofold: (i) soil resistance (Rsoil) increased with soil surface relative humidity (RHsurf), but (ii) this relationship exhibited large site-by-site variability. Further analysis showed that the minimum soil resistance (corresponding to completely dry soil surface or RHsurf = 0%) and the increase of Rsoil with RHsurf are both linked to soil clay content. These results can be explained by (i) the soil surface available for O3 deposition at a microscopic scale which is a function of the soil specific surface area, and (ii) the capacity of a soil to adsorb water according to its clay content and therefore to reduce the surface active for O3 deposition. From these results, a new parameterization has been established to estimate Rsoil as a function of RHsurf and soil clay fraction.

中文翻译：

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土壤臭氧沉积：土壤抵抗力对土壤质地的依赖性

摘要 土壤沉积是对流层臭氧（O3）去除的重要途径，但其控制因素尚不清楚。在这里，我们探讨了响应土壤质地的土壤 O3 抗性的可变性。为此，使用了五个地点在对比气象条件下通过微气象测量获得的裸土上的 O3 沉积数据。获得的结果是双重的：(i) 土壤阻力 (Rsoil) 随土壤表面相对湿度 (RHsurf) 而增加，但 (ii) 这种关系表现出较大的站点间变异性。进一步分析表明，最小土壤阻力（对应于完全干燥的土壤表面或 RHsurf = 0%）和 Rsoil 随着 RHsurf 的增加都与土壤粘土含量有关。这些结果可以解释为 (i) 在微观尺度上可用于 O3 沉积的土壤表面，这是土壤比表面积的函数，以及 (ii) 土壤根据其粘土含量吸收水分的能力，因此以降低 O3 沉积的表面活性。根据这些结果，建立了一个新的参数化方法来估计 Rsoil 作为 RHsurf 和土壤粘土分数的函数。