Abstract The particle number concentrations, size distributions, and new particle formation (NPF) events were investigated in the South Asian outflow over the southeastern Arabian Sea (SEAS), the northern (NIO) and equatorial Indian Ocean (EIO) during the winter of 2018 based on the extensive measurements of particle number size distributions in size range 10–414 nm in the marine atmospheric boundary layer (MABL) as part of the Integrated Campaign for Aerosols, gases, and Radiation Budget (ICARB - 2018) experiment. The total particle concentrations were higher (as high as 106 cm−3; mean ~8857 ± 13425 cm−3) over the SEAS in the proximity to the continental outflow, which gradually decreased to reach the lowest values over the remote EIO (~3206 ± 4406 cm−3). Several NPF events with conspicuous bimodal size distributions and 3–10 times enhancement in nucleation particle (

中文翻译：

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大陆流出期间北印度洋上空的粒子数大小分布和新粒子形成事件

摘要 研究了 2018 年冬季在阿拉伯海东南部 (SEAS)、北部 (NIO) 和赤道印度洋 (EIO) 的南亚外流中的粒子数浓度、尺寸分布和新粒子形成 (NPF) 事件。作为气溶胶、气体和辐射收支综合运动 (ICARB - 2018) 实验的一部分，对海洋大气边界层 (MABL) 中粒径范围为 10-414 nm 的粒子数大小分布进行了广泛测量。在大陆流出附近的 SEAS 上，总粒子浓度较高（高达 106 cm−3；平均 ~8857 ± 13425 cm−3），在远程 EIO（~3206 ± 4406 cm−3)。