globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2329
论文题名:
The time-transgressive termination of the African humid period
作者: Shanahan T.M.; Mckay N.P.; Hughen K.A.; Overpeck J.T.; Otto-Bliesner B.; Heil C.W.; King J.; Scholz C.A.; Peck J.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期:2
起始页码: 140
结束页码: 144
语种: 英语
Scopus关键词: climate forcing ; humid environment ; insolation ; land surface ; radiative forcing ; solar radiation ; transgression ; Africa
英文摘要: During the African Humid Period about 14,800 to 5,500 years ago, changes in incoming solar radiation during Northern Hemisphere summers led to the large-scale expansion and subsequent collapse of the African monsoon. Hydrologic reconstructions from arid North Africa show an abrupt onset and termination of the African Humid Period. These abrupt transitions have been invoked in arguments that the African monsoon responds rapidly to gradual forcing as a result of nonlinear land surface feedbacks. Here we present a reconstruction of precipitation in humid tropical West Africa for the past 20,000 years using the hydrogen isotope composition of leaf waxes preserved in sediments from Lake Bosumtwi, Ghana. We show that over much of tropical and subtropical Africa the monsoon responded synchronously and predictably to glacial reorganizations of overturning circulation in the Atlantic Ocean, but the response to the relatively weaker radiative forcing during the African Humid Period was more spatially and temporally complex. A synthesis of hydrologic reconstructions from across Africa shows that the termination of the African Humid Period was locally abrupt, but occurred progressively later at lower latitudes. We propose that this time-transgressive termination of the African Humid Period reflects declining rainfall intensity induced directly by decreasing summer insolation as well as the gradual southward migration of the tropical rainbelt that occurred during this interval. © 2015 Macmillan Publishers Limited. All rights reserved
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106215
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: University of Texas at Austin, Department of Geological Sciences, 1 University Station C9000, Austin, TX, United States; Northern Arizona University, School of Earth Sciences and Environmental Sustainability, Box 4099, Flagstaff, AZ, United States; Woods Hole Oceanographic Institution, Marine Chemistry and Geochemistry, 360 Woods Hole Road, Woods Hole, MA, United States; Institute of the Environment, University of Arizona, Tucson, AZ, United States; National Center for Atmospheric Research, Climate Change Research, 1850 Table Mesa Drive, Boulder, CO, United States; University of Rhode Island, Graduate School of Oceanography, South Ferry Road, Narragansett, RI, United States; Syracuse University, Department of Earth Sciences, Heroy Geology Laboratory, Syracuse, NY, United States; University of Akron, Department of Earth Sciences, 126 Crouse Hall, Akron, OH, United States

Recommended Citation:
Shanahan T.M.,Mckay N.P.,Hughen K.A.,et al. The time-transgressive termination of the African humid period[J]. Nature Geoscience,2015-01-01,8(2)
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