High Flux of Small Sulfate Aerosols During the 1970s Reconstructed From the SE‐Dome Ice Core in Greenland
High Flux of Small Sulfate Aerosols During the 1970s Reconstructed From the SE‐Dome Ice Core in Greenland
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DOI：
10.1029/2022jd036880
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发表时间：
2022-08
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影响因子：
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通讯作者：
Y. Iizuka;R. Uemura;H. Matsui;N. Oshima;K. Kawakami;S. Hattori;H. Ohno;S. Matoba
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作者：
Y. Iizuka;R. Uemura;H. Matsui;N. Oshima;K. Kawakami;S. Hattori;H. Ohno;S. Matoba
气溶胶显著影响地球的辐射收支，从而影响全球气候。在北极，硫酸盐气溶胶被认为减缓了世纪的变暖。然而，过去硫酸盐气溶胶的趋势知之甚少，特别是气溶胶的大小和组成。在这里，我们分析了格陵兰岛东南部的高分辨率冰芯，比较了人为硫酸盐最大值（1973-1975）和硫排放控制（2010-2012）之间大硫酸盐颗粒和小硫化合物（包括非中和硫酸）的季节性沉积通量。在这两个时期之间，我们发现大直径（>0.4 μm）的通量基本保持不变，而小直径（<0.4 μm）的气溶胶通量显著减少。结果表明，在20世纪70年代，小硫酸盐被有效地激活为云凝结核，从而可能增加云的凝结，抵消变暖。
Aerosols significantly affect Earth's radiation budget, thus influencing global climate. In the Arctic, sulfate aerosols are thought to have reduced the warming during the twentieth century. However, trends in past sulfate aerosols are poorly known, especially the aerosol sizes and compositions. Here, we analyze a high‐resolution ice core from southeastern Greenland, comparing the seasonal deposition flux of large sulfate salt particles and small sulfur compounds, including non‐neutralized sulfuric acid, between the anthropogenic sulfate maximum (1973–1975) and after sulfur emissions control (2010–2012). Between these periods, we find that the large‐diameter (>0.4 μm) flux remains roughly unchanged, yet the small‐diameter (<0.4 μm) aerosol flux significantly decreases. The results indicate that small sulfates were efficiently activated as cloud condensation nuclei during the 1970s, and thus likely increased cloud albedo, offsetting the warming.