globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2452
论文题名:
Stable runoff and weathering fluxes into the oceans over Quaternary climate cycles
作者: Von Blanckenburg F.; Bouchez J.; Ibarra D.E.; Maher K.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期:7
起始页码: 538
结束页码: 542
语种: 英语
英文摘要: Throughout the Quaternary period, the Earthâ €™ s surface has been subject to large changes in temperature and precipitation associated with fluctuations between glacial and interglacial states that have affected biogeochemical cycling. However, the effect of these climate oscillations on weathering is debated, with climate modelling efforts using empirical relationships between measures of climate and weathering suggesting minimal changes in global weathering rates between these two climate states. The ratio of the cosmogenic isotope 10 Be, which is produced in the atmosphere and deposited to the oceans and the land surface, to 9 Be, which is introduced to the oceans by the riverine silicate weathering flux, can be used to track relative weathering fluxes. Here we apply this proxy to marine sediment beryllium records spanning the past two million years, and find no detectable shifts in inputs from global silicate weathering into the oceans. Using climate model simulations of the Last Glacial Maximum along with a model for silicate weathering, we find that there was large regional variability in runoff between glacial and interglacial periods, but that this regional variability was insufficient to shift global weathering fluxes. We suggest that this stability in weathering explains the observation that the removal of CO 2 from the atmosphere by silicate weathering has been in approximate balance with CO 2 degassing over the past 600,000 years. © 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/106238
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: Earth Surface Geochemistry, Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Telegraphenberg, Potsdam, Germany; Institute of Geological Sciences, Freie Universität Berlin, Berlin, Germany; Department of Environmental Earth System Science, Stanford University, Stanford, CA, United States; Department of Geological and Environmental Sciences, Stanford University, Stanford, CA, United States; Institut de Physique du Globe de Paris, 1 rue Jussieu, Paris 05, France

Recommended Citation:
Von Blanckenburg F.,Bouchez J.,Ibarra D.E.,et al. Stable runoff and weathering fluxes into the oceans over Quaternary climate cycles[J]. Nature Geoscience,2015-01-01,8(7)
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