Southern Alaska as a source of atmospheric mineral dust and ice-nucleating particles.
Southern Alaska as a source of atmospheric mineral dust and ice-nucleating particles.
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DOI：
10.1126/sciadv.adg3708
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发表时间：
2023-08-18
期刊：
影响因子：
13.6
通讯作者：
Murray, Benjamin J.
中科院分区：
文献类型：
--
作者：
Barr, Sarah L.;Wyld, Bethany;McQuaid, James B.;Neely III, Ryan R. R.;Murray, Benjamin J.
冰核粒子（INPs）影响云的辐射特性和气候，然而，INP的来源和浓度的限制很差，特别是在高纬度地区。阿拉斯加南部是已知的高纬度尘埃来源，但其对大气矿物尘埃和INP浓度的贡献尚未量化。我们发现，在阿拉斯加南部收集的冰川尘埃是一种有效的冰成核材料的条件下相关的混合相云，是更活跃的比低纬度的灰尘，因为生物成分，提高其活动。我们使用分散模型表明，该来源有助于区域INP人口和粉尘排放的北美地区广泛的运输，达到海拔高度，它可能会导致云冰川。我们的研究结果强调了量化高纬度尘埃的排放和冰成核特性的重要性，并建议在这些地区排放的尘埃的冰成核能力应代表在模型中使用不同的参数化低纬度尘埃。来自阿拉斯加的冰川尘埃使冰成核，并被输送到可能在混合云中开始冰形成的地区
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. Glacial dust from Alaska nucleates ice and is transported to regions where it could initiate ice formation in mixed-phase clouds
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