DOI: 10.1016/j.gloplacha.2012.10.013
论文题名: Milankovitch tuning of deep-sea records: Implications for maximum rates of change of sea level
作者: Berger W.H.
刊名: Global and Planetary Change
ISSN: 0921-8325
出版年: 2013
卷: 101 起始页码: 131
结束页码: 143
语种: 英语
英文关键词: Ice age
Scopus关键词: Abundance distribution
; Certain hypothesis
; Deep-sea floor
; Deglaciations
; Ice age
; Ice mass
; Milankovitch
; Milankovitch forcing
; Polar ice
; Sea level rise
; Standard deviation
; Time span
; Typical values
; Younger Dryas
; Feedback
; Sea level
; Ice
; climate feedback
; climate forcing
; deep sea
; deglaciation
; melting
; Milankovitch cycle
; Pleistocene
; polar region
; sea ice
; sea level change
; threshold
; Younger Dryas
英文摘要: The analysis of several stacked and tuned records from the deep-sea floor yields two rather different sets of values for rates of sea-level rise. One of these reflects "regular" growth and decay and the other represents rapid decay of polar ice. Typical rise rates during rapid decay are near 1.2 m per century; with higher values seemingly following an abundance distribution that may be described by a standard deviation of 0.4 m per century (one third of the typical value). Distributions are based on a millennium resolution, leaving room for higher values for selected centuries within any millennium. Nevertheless, rise values beyond 5 m per century seem highly unusual. The quality of the match between deep-sea record (taken as differential) and Milankovitch forcing is excellent for the last 400,000 years (that is, the time since the "mid-Brunhes Event," a period that may be referred to as the "Emiliani Chron") but is poor in certain time spans before that. Difficulties associated with precise dating and a changing level of instability of polar ice prevent identification of trigger events for deglaciation. What is observable is that during periods of rapid decay, once sea level started to rise, it kept doing so for millennia (presumably till suitable ice masses were used up). Thus, it seems that a rise of sea level is itself a positive feedback on rapid melting of ice. Negative feedback, if real (as assumed in certain hypotheses about the origin of the Younger Dryas) is an unexpected exception that presumably relies on a high threshold value of sea-level rise. © 2012. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84873264866&doi=10.1016%2fj.gloplacha.2012.10.013&partnerID=40&md5=d35815183bc892dca5da268c1526659a
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11231
Appears in Collections: 全球变化的国际研究计划
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作者单位: Scripps Institution of Oceanography, University of California, San Diego, CA, United States
Recommended Citation:
Berger W.H.. Milankovitch tuning of deep-sea records: Implications for maximum rates of change of sea level[J]. Global and Planetary Change,2013-01-01,101.