The North American Cordillera—An Impediment to Growing the Continent-Wide Laurentide Ice Sheet
نویسندگان
چکیده
منابع مشابه
Keewatin Ice Sheet—Re-evaluation of the traditional concept of the Laurentide Ice Sheet
Patterns of dispersal of distinctive Proterozoic and Paleozoic erratics across terrain formed on Archean and Aphebian crystalline rocks indicate that (1) ice never f lowed from Hudson Bay into Keewatin in the region from the Manitoba border (lat 6 0 ° N ) northward at least to lat 65°N; (2) westward-southwestward f low out of the bay, probably from a Labradorean dispersal center, interfaced wit...
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A boxmodel of the Great Lakes is used to estimate meltwater flow into the North Atlantic between 8000 and 14,000 calendar years B.P. Controls on the model include the oxygen isotopic composition of meltwaters and lake waters as measured in the shells of ostracodes. Outflow rates are highest when oxygen isotopic values of the lake waters are most negative, denoting a maximum glacial meltwater co...
متن کاملDynamics of the North American continent
S U M M A R Y The forces that cause deformation of western North America have been debated for decades. Recent studies, primarily based on analysis of crustal stresses in the western United States, have suggested that the deformation of the region ismainly controlled by gravitational potential energy (GPE) variations and boundary loads, with basal tractions due to mantle flow playing a relative...
متن کاملParallel climate and vegetation responses to the early Holocene collapse of the Laurentide Ice Sheet
Parallel changes in lake-level and pollen data show that the rapid decline of the Laurentide Ice Sheet (LIS) between 10,000 and 8000 cal yr BP triggered a step-like change in North American climates: from an ice-sheet-and-insolation-dominated climate to a climate primarily controlled by insolation. Maps of the lake-level data from across eastern North America show a reorganization of climate pa...
متن کاملBinge/purge Oscillations of the Laurentide Ice Sheet as a Cause of the North Atlantic's Heinrich Events
Ice-rafted debris in sediment cores from the North Atlantic suggests that the Laurentide ice sheet (LIS) periodically disgorged icebergs in brief but violent episodes which occurred approximately every 7,000 years. Here, I propose that Heinrich events (i.e., what these episodes are called) were caused by free oscillations in the flow of the Laurentide ice sheet which arose because the floor of ...
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ژورنال
عنوان ژورنال: Journal of Climate
سال: 2015
ISSN: 0894-8755,1520-0442
DOI: 10.1175/jcli-d-15-0044.1