globalchange  > 过去全球变化的重建
DOI: 10.1007/s00382-013-1706-z
Scopus记录号: 2-s2.0-84888065660
论文题名:
Model support for forcing of the 8.2 ka event by meltwater from the Hudson Bay ice dome
作者: Wagner A.J.; Morrill C.; Otto-Bliesner B.L.; Rosenbloom N.; Watkins K.R.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 41, 期:2017-11-12
起始页码: 2855
结束页码: 2873
语种: 英语
英文关键词: 8.2 ka event ; Abrupt climate change ; Atlantic Meridional Overturning Circulation ; Coupled climate model ; Freshwater forcing
英文摘要: Previous model experiments of the 8.2 ka event forced by the drainage of Lake Agassiz often do not produce climate anomalies as long as those inferred from proxies. In addition to the Agassiz forcing, there is new evidence for significant amounts of freshwater entering the ocean at 8.2 ka from the disintegration of the Laurentide ice sheet (LIS). We use the Community Climate System Model version 3 (CCSM3) to test the contribution of this additional meltwater flux. Similar to previous model experiments, we find that the estimated freshwater forcing from Lake Agassiz is capable of sustaining ocean and climate anomalies for only two to three decades, much shorter than the event duration of ~150 years in proxies. Using new estimates of the LIS freshwater flux (~0.13 Sv for 100 years) from the collapse of the Hudson Bay ice dome in addition to the Agassiz drainage, the CCSM3 generates climate anomalies with a magnitude and duration that match within error those from proxies. This result is insensitive to the duration of freshwater release, a major uncertainty, if the total volume remains the same. An analysis of the modeled North Atlantic freshwater budget indicates that the Agassiz drainage is rapidly transported out of the North Atlantic while the LIS contribution generates longer-lasting freshwater anomalies that are also subject to recirculation by the subtropical gyre back into the North Atlantic. Thus, the meltwater flux originating from the LIS appears to be more important than the Agassiz drainage in generating 8.2 ka climate anomalies and is one way to reconcile some model-data discrepancies. © 2013 Springer-Verlag Berlin Heidelberg.
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被引频次[WOS]:31   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54707
Appears in Collections:过去全球变化的重建

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作者单位: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, 80309, United States; Paleoclimatology Branch, NOAA's National Climatic Data Center, Boulder, CO, 80305, United States; Climate and Global Dynamics Division, National Center for Atmospheric Research, Boulder, CO, 80305, United States; Department of Atmospheric and Oceanic Sciences, University of Wisconsin-Madison, Madison, WI, 53706, United States; Center for Marine Science, University of North Carolina Wilmington, 601 South College Road, Wilmington, NC, 28403, United States

Recommended Citation:
Wagner A.J.,Morrill C.,Otto-Bliesner B.L.,et al. Model support for forcing of the 8.2 ka event by meltwater from the Hudson Bay ice dome[J]. Climate Dynamics,2013-01-01,41(2017-11-12)
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