Hi All, The global warming from ice age to the present, why it stopped there? 1) Methane clatrates of the Arctic Ocean (and elsewhere) were re-pressurised by the rising sea levels world-wide. This shut down a supply of methane, a Greenhouse gas, during the warming period from Last Glacial Maximum to Younger Dryas whereabouts. 2) The continental sea beds (i.e. Beringia) that were exposed to air at the end of ice age, no longer were warmed and decomposing as the heat and sunlight no longer had a direct hit on them as the sea advanced, buried and removed them from melted permafrost areas. 3) Just like theories suggest that the climatic cooling that followed the Medieval bubonic plaques, [due to some 60% of agricultural land reverting back to forests], the growing vegetation of the warmer world at the end of ice age self-regulated by absorving CO2 to advancing forests.
4) I tend to agree with most Greenlanders that the impact of variations of Gulf Stream in the overall heat budget of the entire Northern Hemisphere has been overplayed. Despite of weakening of Gulf Stream and virtually complete shutdown of Newfounland branch, even these regions where southernly sea currents have been seen disappearing have also warmed up due to increased winds that have largely replaced heat losses from sea currents, storms delivering heat more erratically. 5) The issues raised at United Nations General Assembly back in 1992 suggesting that the Western countries are wrong, and the paleo-glaciation in Northern hemisphere was geothermally induced event rather than the currently popular paradigm of orbital forcings that caused the ice age. The recent discrepancies in the onset of Greenland's glaciation timing of which has been pushed from Pleiostocene 2-3 Myr to Oligocene 23 Myr has highlighted the uncertainties and method reliability for the timing estimates and astronomic cause paradigm as advocated by the western countries. If you have any contacts interested in our investigation on geothermal fluctuations role on creation of ice ages and interglacials instead of Milankovits orbital forcings, your feed back would be much appreaciated as we are dealing with the complaint to the UN Under Secretary. Any issues on sea level instability, outside the normal melting ranges, also predominanly plays role in this also. As we are working with contentious issue raised at the UN about abuse of the Western nations gravitating the scientific debate to their "hugging of each other", we are not rushed to put out every aspects without consultation to the coalition of nation principals. Nor we have evidence collected to back the geothermally induced ice age hypothesis (run of short life cosmogenic carbon-14 from subglacial, pre-glaciation era Greenland biodetritus). Rgs, albert 1. Meltwater turned off the Gulf Stream, allowing the Arctic sea ice to grow, cooling the Arctic region with positive feedback on this cooling sufficient to make the global temperature fall sharply. 2. Despite greenhouse warming from water vapour (a positive feedback on global warming), cloud cover increased, with cloud brightening from the fiercer storms at sea (resulting from the global warming). This extra albedo was sufficient to offset the water vapour greenhouse effect and cool the Gulf Stream, allowing Arctic sea ice to grow. 3. Sea level rise caused pressure on coastal magma chambers, thus increasing volcanic activity, which had an immediate cooling effect, through fine dust and aerosols in the stratosphere. This again could have allowed Arctic sea ice to grow. 4. Any others? From: [EMAIL PROTECTED]: [EMAIL PROTECTED]: [EMAIL PROTECTED]; [EMAIL PROTECTED]: [geo] What stopped global warming before?Date: Thu, 9 Oct 2008 23:21:30 +0100 Hi all, Through the Ice Ages, temperatures rose sharply during interglacial periods, but peaked at around the temperature we have today. This temperature seemed to have been a natural limit. What was the thermostat mechanism that stopped temperatures going higher? Here are some possible theories: 1. Meltwater turned off the Gulf Stream, allowing the Arctic sea ice to grow, cooling the Arctic region with positive feedback on this cooling sufficient to make the global temperature fall sharply. 2. Despite greenhouse warming from water vapour (a positive feedback on global warming), cloud cover increased, with cloud brightening from the fiercer storms at sea (resulting from the global warming). This extra albedo was sufficient to offset the water vapour greenhouse effect and cool the Gulf Stream, allowing Arctic sea ice to grow. 3. Sea level rise caused pressure on coastal magma chambers, thus increasing volcanic activity, which had an immediate cooling effect, through fine dust and aerosols in the stratosphere. This again could have allowed Arctic sea ice to grow. 4. Any others? In each case, grow-back of the Arctic sea may have been crucial to get an amplification of an initial cooling. If so, the Arctic sea ice has been essential to the Earth's thermostat control. But today we are seeing this thermostat breaking in front of our eyes. That is a powerful argument for geoengineering to save the Arctic sea ice. Pronto. Cheers from Chiswick, John _________________________________________________________________ Make a mini you and download it into Windows Live Messenger http://clk.atdmt.com/UKM/go/111354029/direct/01/ --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "geoengineering" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/geoengineering?hl=en -~----------~----~----~----~------~----~------~--~---
