Forcing of the cold event of 8,200 years ago by catastrophic drainage of Laurentide lakes

Article Abstract:

Abrupt climate fluctuations during the Holocene and Late Pleistocene times have been associated with change in ocean circulation, although their causes remains uncertain. A major cooling event in the Holocene occurred between 8,400 and 8,000 years ago in central Greenland and around the north eastern North Atlantic Ocean. It is argued that the event was due to a massive outflow of fresh water from the Hudson Strait based on estimates of the marine reservoir for Hudson Bay. This lends support to the hypothesis that the sudden rise in freshwater flux from the waning Laurentide ice sheet lessened sea surface salinity and altered ocean circulation.

Paleogeography, Holocene paleogeography, Ocean circulation

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Reduced meltwater outflow from the Laurentide ice margin during the Younger Dryas

Article Abstract:

Dinoflagellates-based salinity and temperature studies of the deglaciation at the mouth of the St Lawrence drainage system reveal reduced meltwater pulses during the Younger Dryas event and absence of such pulses before and after the event. These observations virtually negate the triggering mechanism of the Broecker hypothesis, unless the North Atlantic thermohaline circulation is more sensitive to small salinity changes than predicted by various models. The hypothesis explains the Younger Dryas as the effect of discharge of large amounts of melt water into the North Atlantic.

Analysis, Usage, Dinoflagellates, Sea-water, Seawater, Water levels, North Atlantic Ocean, Saint Lawrence River

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Outflow-infall interactions as a mechanism for terminating accretion in protostars

Article Abstract:

It has been possible to obtain observational evidence for an interaction between infalling and outflowing molecular gas in protostars. This interaction leads to a change from spherical to an equatorial infall. It has been established that the opening angle of the outflow widens with time, and this is seen as a natural mechanism to prevent the infall, and thus stop the accreting phase in protostars.

Stars

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