Science (New York, N.Y.) · 2024
Stratospheric air intrusions promote global-scale new particle formation.
СтатьяНазвание и аннотация: Перевод в очереди
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Zhang Jiaoshi, Gong Xianda, Crosbie Ewan, Diskin Glenn, Froyd Karl, Hall Samuel, Kupc Agnieszka, Moore Richard, Peischl Jeff, Rollins Andrew, Schwarz Joshua, Shook Michael, Thompson Chelsea, Ullmann Kirk, Williamson Christina, Wisthaler Armin, Xu Lu, Ziemba Luke, Brock Charles A, Wang Jian
Аннотация
New particle formation in the free troposphere is a major source of cloud condensation nuclei globally. The prevailing view is that in the free troposphere, new particles are formed predominantly in convective cloud outflows. We present another mechanism using global observations. We find that during stratospheric air intrusion events, the mixing of descending ozone-rich stratospheric air with more moist free tropospheric background results in elevated hydroxyl radical (OH) concentrations. Such mixing is most prevalent near the tropopause where the sulfur dioxide (SO2) mixing ratios are high. The combination of elevated SO2 and OH levels leads to enhanced sulfuric acid concentrations, promoting particle formation. Such new particle formation occurs frequently and over large geographic regions, representing an important particle source in the midlatitude free troposphere.