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First Observational Evidence That Dust-Driven Cloud Phase Changes Cool the Surface Over Summertime Arctic Sea Ice
Geophysical Research Letters ( IF 4.6 ) Pub Date : 2024-10-05 , DOI: 10.1029/2024gl110423
L. M. Zamora, R. A. Kahn

Cloud phase has important impacts on Arctic surface temperatures, and circumstantial evidence suggests that dust aerosols have strong regional impacts on Arctic cloud phase. We used 7 years of satellite observations and model and reanalysis products to control for co-varying meteorology, and to assess how dust and other aerosols impact cloud phase and cloud radiative effects over the summertime sea ice. We focus on clouds at 3 km, where dust modeling is most accurate. There is strong indication that dust aerosols caused about 4.5% of clouds below −15°C to change phase, with smaller effects at higher temperatures. Sulfate has a smaller impact on cloud phase. Dust is associated with cloud-mediated surface cooling of up to a 6.3 W m−2 below single-layer clouds at ∼3 km in June. This is the first observational study to constrain likely dust-related cloud radiative effects over the summertime Arctic sea ice.

中文翻译:


第一个观测证据表明尘埃驱动的云相变化使夏季北极海冰表面冷却



云相对北极表面温度有重要影响,间接证据表明沙尘气溶胶对北极云相有强烈的区域影响。我们使用了 7 年的卫星观测、模型和再分析产品来控制共同变化的气象,并评估灰尘和其他气溶胶如何影响夏季海冰上的云相和云辐射效应。我们重点关注 3 公里处的云,那里的尘埃建模最为准确。有强有力的迹象表明,尘埃气溶胶导致约 4.5% 低于 -15°C 的云发生相变,在较高温度下影响较小。硫酸盐对云相的影响较小。 6 月份,尘埃与云介导的表面冷却有关,单层云下方约 3 公里处的表面冷却高达 6.3 W m -2 。这是第一项旨在限制夏季北极海冰上可能与尘埃相关的云辐射影响的观测研究。
更新日期:2024-10-05
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