Dominant Role of Arctic Dust With High Ice Nucleating Ability in the Arctic Lower Troposphere

• DOI: 10.1029/2022gl102470
• Publication Date: 2023-04-25T23:29:55Z
• Authors: Kei Kawai; Hitoshi Matsui; Yutaka Tobo
• Keywords: Arctic geoengineering; Ice nucleus

Abstract Recent observations show that dust emitted within the Arctic (Arctic dust) has a remarkably high ice nucleating ability, especially between −20°C and −5°C, but its impacts on number concentrations of particles (INPs) radiative balance in are not well understood. Here we incorporate an observation‐based ice‐nucleation parameterization indicating ability into global aerosol‐climate model. A simulation using this better reproduces INP estimates >100 times higher with ∼100% contribution from lower troposphere (>60°N >700 hPa) during summer fall (June–November) than applying standard suitable for desert to dust. Our results demonstrate importance considering when simulating INPs their effects aerosol‐cloud interactions Arctic.