Inception, Growth and Decay of the 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...
متن کاملYounger Dryas Interval and Outflow from the Laurentide Ice Sheet
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 کاملQuantifying ice-sheet feedbacks during the last glacial inception
[1] The last glacial inception ( 116 ky ago) has long been used to test the sensitivity of climate models to insolation. From these simulations, atmospheric, oceanic and vegetation feedbacks have been shown to amplify the initial insolation signal into a rapid growth of ice-sheets over the northern hemisphere. However, due to the lack of comprehensive atmosphere-ocean-vegetation-northern hemisp...
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 کاملModeling the subglacial hydrology of the James Lobe of the Laurentide Ice Sheet
To investigate the drainage conditions that might be expected to develop beneath soft-bedded ice sheets, we modeled the subglacial hydrology of the James Lobe of the Laurentide Ice Sheet from Hudson Bay to the Missouri River. Simulations suggest the James Lobe had little effect on regional groundwater flow because the poorly conductive Upper-Cretaceous shale that occupies the upper layer of the...
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ژورنال
عنوان ژورنال: Episodes
سال: 1987
ISSN: 0705-3797,2586-1298
DOI: 10.18814/epiiugs/1987/v10i1/006