DOI: 10.1038/ngeo2813
论文题名: Late Miocene global cooling and the rise of modern ecosystems
作者: Herbert T.D. ; Lawrence K.T. ; Tzanova A. ; Peterson L.C. ; Caballero-Gill R. ; Kelly C.S.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期: 11 起始页码: 843
结束页码: 847
语种: 英语
Scopus关键词: aridity
; carbon dioxide
; climate forcing
; cooling
; global change
; Miocene
; Northern Hemisphere
; paleoceanography
; paleoclimate
; plant community
; proxy climate record
; sea surface temperature
; subtropical region
; temperature gradient
; terrestrial ecosystem
; Animalia
英文摘要: During the late Miocene epoch, about seven million years ago, large areas of the continents experienced drying, enhanced seasonality, and a restructuring of terrestrial plant and animal communities. These changes are seen throughout the subtropics, but have typically been attributed to regional tectonic forcing. Here we present a set of globally distributed sea surface temperature records spanning the past 12 million years based on the alkenone unsaturation method. We find that a sustained late Miocene cooling occurred synchronously in both hemispheres, and culminated with ocean temperatures dipping to near-modern values between about 7 and 5.4 million years ago. The period of maximum cooling coincides with evidence for transient glaciations in the Northern Hemisphere and with a steepening of the pole-to-equator temperature gradient, as well. We thus infer that late Miocene aridity and terrestrial ecosystem changes occurred in a global context of increasing meridional temperature gradients. We conclude that a global forcing mechanism, such as the previously hypothesized decline in atmospheric CO2 levels between eight and six million years ago, is required to explain the late Miocene changes in temperature, climate and ecosystems. © 2016 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105903
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, Environmental and Planetary Sciences, Brown University, Providence, RI, United States; Department of Geology and Environmental Geosciences, Lafayette College, Easton, PA, United States; Environmental Studies, Luther College, 700 College Drive, Decorah, IA, United States
Recommended Citation:
Herbert T.D.,Lawrence K.T.,Tzanova A.,et al. Late Miocene global cooling and the rise of modern ecosystems[J]. Nature Geoscience,2016-01-01,9(11)