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Stratospheric air intrusions promote global-scale new particle formation （ 由于标题字数限制， 中文标题为自翻，以原标题为准） Editor’s summary Aerosol particle production from gas-phase precursors, a process called new particle formation (NPF), creates approximately half of the cloud condensation nuclei that form in the atmosphere. This process is a major control on cloudiness, Earth’s radiative balance, and climate. Zhang et al. present evidence that the intrusion of ozone-rich stratospheric air into the underlying troposphere leads to mixing and generation of sulfuric acid from sulfur dioxide, leading to NPF (see the Perspective by Coe). This discovery identifies another mechanism for NPF that is distinct from the main mechanism known so far, which involves outflow from convective clouds. —Jesse Smith Abstract New particle formation in the free troposphere is a major source of cloud condensation nuclei globally. The prevailing view is that in the free t
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