* Astronomy

Title: Atmospheric hypotheses' of Earth's global warming
Authors: V. Shaidurov
(Version v2, 6 Mar 2006)

When analysing the mean-year trend of the Earth's surface temperature for the past 140 years one can discern two sections of monotone linear increase of temperature during two last industrial centuries. The first one begins somewhere in the period 1906-1909. The previous segment demonstrates a weak decrease in the temperature trend, not increase. For explanation of this sudden break we look for a phenomenon of cosmic scale during this time which could have given rise to beginning of global warming with a significant probability. On the 30th June 1908 Tungus meteorite exploded with the power of ~15 Mt TNT at an altitude of ~10 km. Such an explosion could cause considerable stirring of the high layers of atmosphere and change its structure in mesosphere. The difference between this mesosphere catastrophe and atmospheric nuclear tests that cause another break in the temperature plot is discussed. The purpose of this report is to open the debate and to encourage discussion among scientists.

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A group of Italian researchers under supervision of famous marine geologist Luca Gasperini has published an article in  Terra Nova magazine, in which suggests searching for impact crater of Tunguska meteorite in a place, completely different from previously known.

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Title: A possible impact crater for the 1908 Tunguska Event
Authors: L. Gasperini, F. Alvisi1, G. Biasini, E. Bonatti, G. Longo, M. Pipan, M. Ravaioli, R. Serra

The so-called Tunguska Event refers to a major explosion that occurred on 30 June 1908 in the Tunguska region of Siberia, causing the destruction of over 2000 km² of taiga, globally detected pressure and seismic waves, and bright luminescence in the night skies of Europe and Central Asia, combined with other unusual phenomena. The Tunguska Event may be related to the impact with the Earth of a cosmic body that exploded about 510 km above ground, releasing in the atmosphere 1015 Mton of energy. Fragments of the impacting body have never been found, and its nature (comet or asteroid) is still a matter of debate. We report results from the investigation of Lake Cheko, located ~8 km NNW of the inferred explosion epicentre. Its funnel-like bottom morphology and the structure of its sedimentary deposits, revealed by acoustic imagery and direct sampling, all suggest that the lake fills an impact crater. Lake Cheko may have formed due to a secondary impact onto alluvial swampy ground; the size and shape of the crater may have been affected by the nature of the ground and by impact-related melting and degassing of a permafrost layer.

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Latitude: 60.963969° Longitude: 101.859947°

-- Edited by Blobrana at 19:02, 2007-06-22

A new theory to explain global warming was revealed at a meeting at the UK University of Leicester. The controversial theory has nothing to do with burning fossil fuels and atmospheric carbon dioxide levels but blames the warming on the Tunguska Event of 1908 that happened in a remote part of Siberia, the Science Blog reported Wednesday.
According to Vladimir Shaidurov of the Russian Academy of Sciences, the global warming of the past 100 years could be due to atmospheric changes that are not connected to human emissions of carbon dioxide from the burning of natural gas and oil.
Shaidurov explains that there was a slight decrease in temperature until the early twentieth century, which flies in the face of current global warming theories that blame a rise in temperature on rising carbon dioxide emissions since the start of the industrial revolution.

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