Detecting supramolecular organic nanoparticles during heat wave

作者：Renyi Zhang, Yixin Li, Jiayun Zhao, Bianca P. Aridjis-Olivos, Lijun Zhao, Veronica Kowalewski, Maisha Kabir, Natalie M. Johnson, Erik R. Nielsen, Sarah D. Brooks, Yue Zhang, Arnold Vedlitz, Weston W. Porter, Simon W. North, Wanhe Li, Michael W. Young, John H. Seinfeld, Yuhan Wang, Yuan Wang · 发表于：Science · 年份：2026 · DOI：10.1126/science.ady5192 · 被引用次数：4 · 研究领域：Atmospheric chemistry and aerosols、Air Quality and Health Impacts、Atmospheric aerosols and clouds

New particle formation (NPF) represents a major source of tropospheric fine aerosols. A common viewpoint is that NPF hinges thermodynamically on the volatility of condensing species and is unfavorable at high temperatures. From an intensive field campaign, we observed frequent NPF events during a heat wave. Size-resolved chemical composition of nanoparticles down to 3 nanometers was first measured, unraveling a dominant presence of carboxylic acids. Our work uncovers a spontaneous mechanism to produce supramolecular nanoparticles through self-assembly of organic acids. This discovery explains not only the unexpected NPF at high temperatures but also its ubiquitous occurrence under diverse atmospheric conditions. As global warming leads to more frequent and intense heat waves, our findings open avenues for assessing the impacts of aerosols on cloud formation, public health, and climate.