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High Flux of Small Sulfate Aerosols During the 1970s Reconstructed From the SE-Dome Ice Core in Greenland

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Title: High Flux of Small Sulfate Aerosols During the 1970s Reconstructed From the SE-Dome Ice Core in Greenland
Authors: Iizuka, Y. Browse this author →KAKEN DB
Uemura, R. Browse this author →KAKEN DB
Matsui, H. Browse this author →KAKEN DB
Oshima, N. Browse this author →KAKEN DB
Kawakami, K. Browse this author
Hattori, S. Browse this author →KAKEN DB
Ohno, H. Browse this author
Matoba, S. Browse this author →KAKEN DB
Keywords: ice core
anthropogenic sulfate maximum
Issue Date: 16-Sep-2022
Publisher: American Geophysical Union
Journal Title: Journal of geophysical research atmospheres
Volume: 127
Issue: 17
Start Page: e2022JD036880
Publisher DOI: 10.1029/2022JD036880
Abstract: 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 mu m) flux remains roughly unchanged, yet the small-diameter (<0.4 mu m) 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.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 飯塚 芳徳

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