2014 Fiscal Year Final Research Report
Past atmospheric characteristics of glacial and interglacial periods reconstructed from aerosol compositions preserved in bipolar ice cores.
| Project/Area Number |
23681001
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Project Period (FY) |
2011-04-01 – 2015-03-31
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| Keywords | アイスコア / 古環境復元 / エアロゾル / 南極 / 北極 / 硫酸塩 |
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| Outline of Final Research Achievements |
Sulphate aerosols, particularly micron-sized particles of sulphate salt and sulphate-adhered dust, can act as cloud condensation nuclei, leading to increased solar scattering. Evidence for sulphate-climate coupling in the current era has not been found, but may be revealed in the long-term sulphate record from polar ice cores. Melted ice-core samples have previously provided only sulphate-ion concentrations, which may be due to sulphuric acid. We present profiles of sulphate-salt fluxes over the past 300,000 years from the Dome Fuji ice core in inland Antarctica. Results show the sulphate-salt flux correlates inversely with temperature, suggesting a climatic coupling between particulate sulphur and temperature. Although based on a model with serious uncertainties when applied to the ice core record, this analysis indicates that the glacial-to-interglacial decrease in sulphate would lessen the aerosol indirect effects on cloud albedo, leading to an Antarctic warming of 0.1 to 5.2 K.
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| Free Research Field |
雪氷学
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