globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2353
论文题名:
Aerosol forcing of the position of the intertropical convergence zone since ad 1550
作者: Ridley H.E.; Asmerom Y.; Baldini J.U.L.; Breitenbach S.F.M.; Aquino V.V.; Prufer K.M.; Culleton B.J.; Polyak V.; Lechleitner F.A.; Kennett D.J.; Zhang M.; Marwan N.; Macpherson C.G.; Baldini L.M.; Xiao T.; Peterkin J.L.; Awe J.; Haug G.H.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期:3
起始页码: 195
结束页码: 200
语种: 英语
Scopus关键词: aerosol composition ; carbon isotope ; human activity ; intertropical convergence zone ; isotopic composition ; Northern Hemisphere ; precipitation (climatology) ; Southern Hemisphere ; speleothem ; twentieth century ; volcanic eruption ; Belize [Central America]
英文摘要: The position of the intertropical convergence zone is an important control on the distribution of low-latitude precipitation. Its position is largely controlled by hemisphere temperature contrasts. The release of aerosols by human activities may have resulted in a southward shift of the intertropical convergence zone since the early 1900s (refs,) by muting the warming of the Northern Hemisphere relative to the Southern Hemisphere over this interval, but this proposed shift remains equivocal. Here we reconstruct monthly rainfall over Belize for the past 456 years from variations in the carbon isotope composition of a well-dated, monthly resolved speleothem. We identify an unprecedented drying trend since ad 1850 that indicates a southward displacement of the intertropical convergence zone. This drying coincides with increasing aerosol emissions in the Northern Hemisphere and also marks a breakdown in the relationship between Northern Hemisphere temperatures and the position of the intertropical convergence zone observed earlier in the record. We also identify nine short-lived drying events since ad 1550 each following a large volcanic eruption in the Northern Hemisphere. We conclude that anthropogenic aerosol emissions have led to a reduction of rainfall in the northern tropics during the twentieth century, and suggest that geographic changes in aerosol emissions should be considered when assessing potential future rainfall shifts in the tropics. © 2015 Macmillan Publishers Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106253
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: Department of Earth Sciences, University of Durham, Durham, United Kingdom; Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM, United States; Department of Earth Science, Eidgenössische Technische Hochschule (ETH), Zürich, Switzerland; Department of Anthropology, University of New Mexico, Albuquerque, NM, United States; Department of Anthropology, Pennsylvania State University, University Park, PA, United States; Institute for Terrestrial and Planetary Atmospheres, School of Marine and Atmospheric Sciences, Stony Brook, NY, United States; Potsdam Institute for Climate Impact Research, PO Box 60 12 03, Potsdam, Germany; Department of Anthropology, Northern Arizona University, Flagsta, AZ, United States

Recommended Citation:
Ridley H.E.,Asmerom Y.,Baldini J.U.L.,et al. Aerosol forcing of the position of the intertropical convergence zone since ad 1550[J]. Nature Geoscience,2015-01-01,8(3)
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