Levitation of single trapped particles enables the exploration of fundamental physicochemical aerosol properties never previously achieved. Experimental measurements showed that (NH₄)₂SO₄’s particle shape deviated from sphericity during the crystallization process. Despite that, salt aerosols are assumed to be spheres even in low relative humidity (RH) in most climate models. In the analysis performed here, Mie and T-Matrix codes were operated to simulate crucial parameters needed to estimate the radiative forcing efficiency: extinction efficiency, asymmetry parameter and backscattering fraction. The incorporation of non-spherical effects in (NH₄)₂SO₄ particles can cause a difference of up to 46% radiative forcing efficiency compared to the assumption of sphericity in the 0.3–0.6 µm particle radius range.

中文翻译：

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颗粒形状对单个悬浮 (NH4)2SO4 颗粒估计的辐射强迫效率的影响

单个被捕获粒子的悬浮能够探索以前从未实现的基本物理化学气溶胶特性。实验测量表明，(NH ₄ ) ₂ SO ₄的颗粒形状在结晶过程中偏离了球形。尽管如此，在大多数气候模型中，即使在低相对湿度 (RH) 下，盐气溶胶也被假定为球体。在这里进行的分析中，使用 Mie 和 T-Matrix 代码来模拟估计辐射强迫效率所需的关键参数：消光效率、不对称参数和反向散射分数。(NH ₄ ) ₂ SO ₄中非球形效应的结合 与 0.3–0.6 µm 粒子半径范围内的球形假设相比，粒子可导致高达 46% 的辐射强迫效率差异。