Bayesian modelling the retreat of the Irish Sea Ice Stream

Bayesian modelling the retreat of the Irish Sea Ice Stream
复制标题

贝叶斯模型对爱尔兰海冰流的消退进行建模

DOI:
10.1002/jqs.2616
复制
发表时间:
2013
影响因子:
2.3
通讯作者:
Chiverrell R
Chiverrell R
中科院分区:
地球科学3区
文献类型:
--
作者:
Chiverrell R

文献摘要

参考文献

被引文献

相似文献

我们展示了8000年的历史,跨越650公里的冰缘退缩,为最大的海洋终止冰流排水前英国-爱尔兰冰盖。地质年代学数据的贝叶斯模型显示,ISIS扩张34.0-25.3 ka,加速进入凯尔特海,达到25.3-24.5 ka的最大值,然后崩溃,边缘迅速退缩到北爱尔兰海盆地(ISB)。由于气候变暖、海平面上升、巨潮振幅和北大西洋经向环流的重新激活,这种退缩是迅速的。撤退虽然迅速,但不均匀,阶梯式撤退模式可能是冰流在正、逆冰床梯度之间通过和冰流几何形状变化的函数。最初,宽的产犊边缘和不利的斜坡促进了快速后退(~ 550 ma - 1),在爱尔兰南部和威尔士之间的地形收缩和水深高峰处减缓了后退(~ 100 ma - 1),然后在ISB北部的不利河床斜坡和更宽更深的盆地构造上加速(~ 200 ma - 1)。这些数据表明,在预测快速崩塌阶段较长期(bbb101000a)冰边缘退缩的模式和速率时,冰床坡度和横向范围的重要性,这对预测当前冰流快速退缩的建模具有重要意义。版权所有©2013 John Wiley & Sons, Ltd
We present an 8000‐year history spanning 650 km of ice margin retreat for the largest marine‐terminating ice stream draining the former British–Irish Ice Sheet. Bayesian modelling of the geochronological data shows the ISIS expanded 34.0–25.3 ka, accelerating into the Celtic Sea to reach maximum limits 25.3–24.5 ka before a collapse with rapid marginal retreat to the northern Irish Sea Basin (ISB). This retreat was rapid and driven by climatic warming, sea‐level rise, mega‐tidal amplitudes and reactivation of meridional circulation in the North Atlantic. The retreat, though rapid, is uneven, with the stepped retreat pattern possibly a function of the passage of the ice stream between normal and adverse ice bed gradients and changing ice stream geometry. Initially, wide calving margins and adverse slopes encouraged rapid retreat (∼550 m a−1) that slowed (∼100 m a−1) at the topographic constriction and bathymetric high between southern Ireland and Wales before rates increased (∼200 m a−1) across adverse bed slopes and wider and deeper basin configuration in the northern ISB. These data point to the importance of the ice bed slope and lateral extent in predicting the longer‐term (>1000 a) patterns and rates of ice‐marginal retreat during phases of rapid collapse, which has implications for the modelling of projected rapid retreat of present‐day ice streams. Copyright © 2013 John Wiley & Sons, Ltd.
DOI: --
发表时间: 2007
期刊:
影响因子: --
作者:
C. Stokes;C. Clark;O. Lian;S. Tulaczyk
通讯作者: S. Tulaczyk
马林大陆架冰盖扩张和衰退的海洋地球物理证据:英属爱尔兰冰盖西部界限的新证据
DOI: --
发表时间: 2010
期刊:
影响因子: --
作者:
P. Dunlop;Rachel Shannon;M. McCabe;R. Quinn;E. Doyle
通讯作者: E. Doyle
英国北爱尔兰海盆地全新世海平面、末次盛冰期冰川海洋环境和地球物理模型
DOI: 10.1016/j.margeo.2006.05.005
发表时间: 2006
期刊: Marine Geology
影响因子: 2.9
作者:
D. Roberts;R. Chiverrell;J. Innes;B. Horton;A. Brooks;G. Thomas;S. Turner;S. González
通讯作者: S. González
英国-爱尔兰最后一个冰盖的生长、动态和消融:深海冰筏碎屑记录
DOI: --
发表时间: 2009
期刊:
影响因子: --
作者:
J. Scourse;Anna I. Haapaniemi;E. Colmenero;V. Peck;I. Hall;W. Austin;P. Knutz;R. Zahn
通讯作者: R. Zahn
DOI: 10.5860/choice.34-4522
发表时间: 1996-08
期刊: --
影响因子: --
作者:
C. Buck;William G. Cavanagh;C. Litton
通讯作者: C. Buck;William G. Cavanagh;C. Litton