CGRG Bibliography of Canadian Geomorphology
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Author : Carlson, A.E.
Date : 2009.
Title : Geochemical constraints on the Laurentide Ice Sheet contribution to Meltwater Pulse 1A.
Publication : Quaternary Science Reviews
Issue : 28(17-18):
Page(s) : 1625-1630.
Abstract
Planktonic and benthic d18O records adjacent to the runoff outlets of the Laurentide Ice Sheet (LIS) indicate that the LIS contributed to the abrupt 20 m rise in sea level 14.6 ka, Meltwater Pulse 1A (MWP-1A). However, the magnitude of the LIS contribution still remains unresolved. Here, I use a freshwater runoff–ocean mixing model to calculate the LIS meltwater required to explain the decreases in planktonic and benthic d18O observed during MWP-1A at the southern, eastern and northern runoff outlets of the LIS. Maximum LIS contributions in equivalent sea level rise for a 500-year long MWP-1A are 2.7 m discharged into the Gulf of Mexico as a combined hyperpycnal and hypopycnal flow, 2.1 m discharged into the North Atlantic, and 0.5 m into the Arctic Ocean, for a total LIS contribution of =5.3 m. A LIS contribution of <30% to MWP-1A supports the hypothesis that a significant component of this MWP was sourced from the Antarctic Ice Sheet.
Bibliography of Canadian Geomorphology