DOI: 10.1038/ngeo2147
论文题名: An ice core record of near-synchronous global climate changes at the Bølling transition
作者: Rosen J.L. ; Brook E.J. ; Severinghaus J.P. ; Blunier T. ; Mitchell L.E. ; Lee J.E. ; Edwards J.S. ; Gkinis V.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期: 6 起始页码: 459
结束页码: 463
语种: 英语
Scopus关键词: atmospheric modeling
; climate variation
; cryosphere
; Dansgaard-Oeschger cycle
; global climate
; ice core
; interstadial
; methane
; paleoclimate
; proxy climate record
; warming
; Arctic
; Greenland
英文摘要: The abrupt warming that initiated the Bølling-Allerød interstadial was the penultimate warming in a series of climate variations known as Dansgaard-Oeschger events. Despite the clear expression of this transition in numerous palaeoclimate records, the relative timing of climate shifts in different regions of the world and their causes are subject to debate. Here we explore the phasing of global climate change at the onset of the Bølling-Allerød using air preserved in bubbles in the North Greenland Eemian ice core. Specifically, we measured methane concentrations, which act as a proxy for low-latitude climate, and the 15N/ 14N ratio of N2, which reflects Greenland surface temperature, over the same interval of time. We use an atmospheric box model and a firn air model to account for potential uncertainties in the data, and find that changes in Greenland temperature and atmospheric methane emissions at the Bølling onset occurred essentially synchronously, with temperature leading by 4.5+21 -24 years. We cannot exclude the possibility that tropical climate could lag changing methane concentrations by up to several decades, if the initial methane rise came from boreal sources alone. However, because even boreal methane-producing regions lie far from Greenland, we conclude that the mechanism that drove abrupt change at this time must be capable of rapidly transmitting climate changes across the globe. © 2014 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106504
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: College of Earth, Ocean, and Atmospheric Science, Oregon State University, Corvallis, OR 97331, United States; Scripps Institution for Oceanography, University of California-San Diego, San Diego, CA 92093, United States; Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark
Recommended Citation:
Rosen J.L.,Brook E.J.,Severinghaus J.P.,et al. An ice core record of near-synchronous global climate changes at the Bølling transition[J]. Nature Geoscience,2014-01-01,7(6)