研究人员表明，在阿拉斯加南部收集的冰川尘埃，在混合相云的相关条件下是一种有效的冰核材料，并且比低纬度的尘埃更活跃，因为有一种生物成分增强了它的活性。研究使用扩散模型来表明，这种来源有助于区域性的 INP 总量，并且所排放的尘埃被输送到北美的广大地区，到达可能导致云冰川的高度。
研究结果强调了量化高纬度尘埃的排放和冰核化特征的重要性，并建议在这些区域排放的尘埃的冰核化能力应该在模型中使用低纬度尘埃的不同参数来表示。
据了解，冰核粒子影响云的辐射特性和气候；然而，特别是在高纬度地区。INP 源和浓度很少受到限制。阿拉斯加南部是一个已知的高纬度尘埃源，但它对大气矿物尘埃和INP浓度的影响尚未被量化。
附：英文原文
Title: Southern Alaska as a source of atmospheric mineral dust and ice-nucleating particles
Author: Sarah L. Barr, Bethany Wyld, James B. McQuaid, Ryan R. Neely III, Benjamin J. Murray
Issue&Volume: 2023-08-16
Abstract: Ice-nucleating particles (INPs) influence cloud radiative properties and climate; however, INP sources and concentrations are poorly constrained, particularly in high-latitude regions. Southern Alaska is a known source of high-latitude dust, but its contribution to atmospheric mineral dust and INP concentrations has not been quantified. We show that glacial dust collected in southern Alaska is an effective ice-nucleating material under conditions relevant for mixed-phase clouds and is more active than low-latitude dust because of a biological component that enhances its activity. We use dispersion modeling to show that this source contributes to the regional INP population and that the dust emitted is transported over a broad area of North America, reaching altitudes where it could cause cloud glaciation. Our results highlight the importance of quantifying emissions and ice-nucleating characteristics of high-latitude dusts and suggest that the ice-nucleating ability of emitted dust in these regions should be represented in models using different parametrizations to low-latitude dust.
DOI: adg3708
Source: https://www.science.org/doi/full/10.1126/sciadv.adg3708