期刊
GEOPHYSICAL RESEARCH LETTERS
卷 50, 期 8, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2022GL102470
关键词
aerosol; Arctic dust; ice nucleating particles; mixed-phase clouds; aerosol-cloud interactions; radiative effect
Recent observations have shown that dust emitted within the Arctic has a high ice nucleating ability, especially in the temperature range of -20°C to -5°C. This study incorporates an observation-based ice-nucleation parameterization into a global aerosol-climate model to better understand the impacts of Arctic dust on ice nucleating particles (INPs) and radiative balance in the Arctic. The results highlight the importance of using an ice-nucleation parameterization suitable for Arctic dust to accurately simulate INPs and their effects on aerosol-cloud interactions in the Arctic.
Recent observations show that dust emitted within the Arctic (Arctic dust) has a remarkably high ice nucleating ability, especially between -20 degrees C and -5 degrees C, but its impacts on the number concentrations of ice nucleating particles (INPs) and radiative balance in the Arctic are not well understood. Here we incorporate an observation-based ice-nucleation parameterization indicating the high ice nucleating ability of Arctic dust into a global aerosol-climate model. A simulation using this parameterization better reproduces INP observations in the Arctic and estimates >100 times higher dust INP number concentrations with similar to 100% contribution from Arctic dust in the Arctic lower troposphere (>60 degrees N and >700 hPa) during summer and fall (June-November) than a simulation applying a standard ice-nucleation parameterization suitable for desert dust to Arctic dust. Our results demonstrate the importance of considering an ice-nucleation parameterization suitable for Arctic dust when simulating INPs and their effects on aerosol-cloud interactions in the Arctic.
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