美国弗吉尼亚理工学院Isaacman-VanWertz Gabriel团队在最新研究中，报道了晚期大气化合物的形成受到快速沉积的抑制。相关论文于2025年2月17日发表于国际顶尖学术期刊《自然—地球科学》杂志上。

研究人员表示，活性有机碳是大气化学反应的重要燃料，包括二次有机气溶胶的形成。然而，与大气氧化过程并行，沉积可以从大气中去除化合物并影响下游环境。

为了了解沉积对大气氧化的影响，研究组提出了一个基于化合物的物理化学性质（亨利定律常数、蒸汽压力和反应速率常数），来预测和可视化分子命运的框架，这些框架以估计氧化和沉积的时间尺度为主题。

通过在化学模型中实现它们的沉积速率，研究组表明，沉积通过去除早期产物和防止下游晚期化合物的大量（高达90%）形成，实质上抑制了大气反应性和气溶胶的形成。在实验室实验和详细的化学模拟中经常缺少沉积，这可能会影响他们对大气成分的理解。

附：英文原文

Title: Formation of late-generation atmospheric compounds inhibited by rapid deposition

Author: Bi, Chenyang, Isaacman-VanWertz, Gabriel

Issue&Volume: 2025-02-17

Abstract: Reactive organic carbon species are important fuel for atmospheric chemical reactions, including the formation of secondary organic aerosol. However, in parallel to atmospheric oxidation processes, deposition can remove compounds from the atmosphere and impact downstream environments. To understand the impact of deposition on atmospheric oxidation, we present a framework for predicting and visualizing the fate of a molecule on the basis of the physicochemical properties of compounds (Henry’s law constant, vapour pressure and reaction rate constants), which are used to estimate timescales for oxidation and deposition. By implementing our deposition rates in chemical models, we show that deposition substantially suppresses atmospheric reactivity and aerosol formation by removing early-generation products and preventing the formation of large fractions (up to 90%) of downstream, late-generation compounds. Deposition is frequently missing in the laboratory experiments and detailed chemical modelling, which probably biases our understanding of atmospheric composition.

DOI: 10.1038/s41561-025-01650-2

Source: https://www.nature.com/articles/s41561-025-01650-2