DOI: 10.1002/gbc.20035
Scopus记录号: 2-s2.0-84881103326
论文题名: Atmospheric Δ14C reduction in simulations of Atlantic overturning circulation shutdown
作者: Matsumoto K ; , Yokoyama Y
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2013
卷: 27, 期: 2 起始页码: 296
结束页码: 304
语种: 英语
英文关键词: abrupt climate change
; carbon cycle
; numerical model
; radiocarbon
Scopus关键词: Abrupt climate change
; Atlantic meridional overturning circulations
; Carbon cycles
; Dynamical response
; Earth system model
; Last glacial cycles
; Overturning circulation
; radiocarbon
; Carbon
; Carbon dioxide
; Climate change
; Earth atmosphere
; Numerical models
; Oceanography
; carbon isotope
; climate variation
; deep sea
; heat transfer
; Last Glacial
; numerical model
; overturn
; paleoceanography
; teleconnection
; venting
; Younger Dryas
; Atlantic Ocean
; Atlantic Ocean (North)
; Southern Ocean
英文摘要: A rapid reduction in the Atlantic meridional overturning circulation (AMOC) can significantly disrupt the global heat transport and likely triggered abrupt climate change during the last glacial cycle. A slowdown in AMOC has long been assumed to inhibit the exchange of carbon between the atmosphere and the deep ocean and thus cause radiocarbon (14C), which is produced in the atmosphere, to accumulate in the atmosphere. Indeed previous model studies have demonstrated that a reduction in AMOC leads to higher atmospheric 14C abundance (Δ14C). However, this seems inconsistent with the observed rise in atmospheric pCO2 during Heinrich 1 and the Younger Dryas stadial events and the emerging view that this CO2 rise resulted from the deep ocean venting "old" carbon. Using an Earth system model, we offer an alternative scenario that AMOC slowdown and an accompanying dynamical response in the south (i.e., the bipolar seesaw) can in fact lead to a decline in atmospheric Δ14C. This decline is realized in the model when the bipolar seesaw and thus the flux of old carbon from the Southern Ocean are sufficiently large so as to overcome the accumulation of 14C in the atmosphere as AMOC is reduced. The bipolar seesaw we describe invokes an oceanic teleconnection, whereby a freshwater perturbation in the North Atlantic drives a southern Δ14C response, but this does not necessarily preclude an atmospheric teleconnection. ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77613
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Earth Sciences, University of Minnesota, 310 Pillsbury Dr., SE, Minneapolis, MN 55455, United States; Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa, Japan
Recommended Citation:
Matsumoto K,, Yokoyama Y. Atmospheric Δ14C reduction in simulations of Atlantic overturning circulation shutdown[J]. Global Biogeochemical Cycles,2013-01-01,27(2)