Reference list is under construction.
by Shaun A. Marcott, Peter U. Clark, Laurie Padman, Gary P. Klinkhammer, Scott R. Springer, Zhengyu Liu, Bette L. Otto-Bliesner, Anders E. Carlson, Andy Ungerer, June Padman, Feng He, Jun Cheng, Andreas Schmittner
Abstract:
Episodic iceberg-discharge events from the Hudson Strait Ice Stream (HSIS) of the Laurentide Ice Sheet, referred to as Heinrich events, are commonly attributed to internal ice-sheet instabilities, but their systematic occurrence at the culmination of a large reduction in the Atlantic meridional overturning circulation (AMOC) indicates a climate control. We report Mg/Ca data on benthic foraminifera from an intermediate-depth site in the northwest Atlantic and results from a climate-model simulation that reveal basin-wide subsurface warming at the same time as large reductions in the AMOC, with temperature increasing by approximately 2â°C over a 1â2 kyr interval prior to a Heinrich event. In simulations with an ocean model coupled to a thermodynamically active ice shelf, the increase in subsurface temperature increases basal melt rate under an ice shelf fronting the HSIS by a factor of approximately 6. By analogy with recent observations in Antarctica, the resulting ice-shelf loss and attendant HSIS acceleration would produce a Heinrich event.
Reference:
Ice-shelf collapse from subsurface warming as a trigger for Heinrich events (Shaun A. Marcott, Peter U. Clark, Laurie Padman, Gary P. Klinkhammer, Scott R. Springer, Zhengyu Liu, Bette L. Otto-Bliesner, Anders E. Carlson, Andy Ungerer, June Padman, Feng He, Jun Cheng, Andreas Schmittner), In Proceedings of the National Academy of Sciences, volume 108, 2011.
Bibtex Entry:
@article{citeulike:9856287,
abstract = {{Episodic iceberg-discharge events from the Hudson Strait Ice Stream (HSIS) of the Laurentide Ice Sheet, referred to as Heinrich events, are commonly attributed to internal ice-sheet instabilities, but their systematic occurrence at the culmination of a large reduction in the Atlantic meridional overturning circulation (AMOC) indicates a climate control. We report Mg/Ca data on benthic foraminifera from an intermediate-depth site in the northwest Atlantic and results from a climate-model simulation that reveal basin-wide subsurface warming at the same time as large reductions in the AMOC, with temperature increasing by approximately 2â°C over a 1â2 kyr interval prior to a Heinrich event. In simulations with an ocean model coupled to a thermodynamically active ice shelf, the increase in subsurface temperature increases basal melt rate under an ice shelf fronting the HSIS by a factor of approximately 6. By analogy with recent observations in Antarctica, the resulting ice-shelf loss and attendant HSIS acceleration would produce a Heinrich event.}},
author = {Marcott, Shaun A. and Clark, Peter U. and Padman, Laurie and Klinkhammer, Gary P. and Springer, Scott R. and Liu, Zhengyu and Otto-Bliesner, Bette L. and Carlson, Anders E. and Ungerer, Andy and Padman, June and He, Feng and Cheng, Jun and Schmittner, Andreas},
citeulike-article-id = {9856287},
citeulike-linkout-0 = {http://dx.doi.org/10.1073/pnas.1104772108},
citeulike-linkout-1 = {http://www.pnas.org/content/108/33/13415.abstract},
citeulike-linkout-2 = {http://www.pnas.org/content/108/33/13415.full.pdf},
citeulike-linkout-3 = {http://view.ncbi.nlm.nih.gov/pubmed/21808034},
citeulike-linkout-4 = {http://www.hubmed.org/display.cgi?uids=21808034},
day = {16},
doi = {10.1073/pnas.1104772108},
journal = {Proceedings of the National Academy of Sciences},
keywords = {abrupt, climate, do-event, heinrich, ice, paleoclimate, shelf, threshold},
month = aug,
number = {33},
pages = {13415--13419},
pmid = {21808034},
posted-at = {2011-10-05 16:45:31},
priority = {2},
title = {{Ice-shelf collapse from subsurface warming as a trigger for Heinrich events}},
url = {http://dx.doi.org/10.1073/pnas.1104772108},
volume = {108},
year = {2011}
}
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