期刊
NATURE
卷 490, 期 7418, 页码 81-84出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nature11359
关键词
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资金
- Ministry of Education, Culture, Sports, Science and Technology(MEXT) [14GS0202, 23680001, 21221002]
- Japan Society for the Promotion of Science (JSPS)
- Institute of Low Temperature Science, Hokkaido University
- Grants-in-Aid for Scientific Research [23680001, 21221002, 23681001] Funding Source: KAKEN
Sulphate aerosols, particularly micrometre-sized particles of sulphate salt and sulphate-adhered dust, can act as cloud condensation nuclei, leading to increased solar scattering that cools Earth's climate(1,2). Evidence for such a coupling may lie in the sulphate record from polar ice cores, but previous analyses of melted ice-core samples have provided only sulphate ion concentrations, which may be due to sulphuric acid(3). Here we present profiles of sulphate salt and sulphate-adhered dust fluxes over the past 300,000 years from the Dome Fuji ice core in inland Antarctica. Our results show a nearly constant flux of sulphate-adhered dust through glacial and interglacial periods despite the large increases in total dust flux during glacial maxima(4). The sulphate salt flux, however, correlates inversely with temperature, suggesting a climatic coupling between particulate sulphur and temperature. For example, the total sulphate salt flux during the Last Glacial Maximum averages 5.78 mg m(-2) yr(-1), which is almost twice the Holocene value. Although it is based on a modern analogue with considerable 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 lifetime and albedo, leading to an Antarctic warming of 0.1 to 5 kelvin.
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