I agree and think that these are early oral histories of mankind coming out of the Toba Catastrophe, and the end of the last Glacial age in which trapped lake were released due to melting glaciers that had damned up all that water, the biggest being the glacial damn in the Bosporus.
The
Toba supereruption was a
supervolcanic eruption that occurred about 75,000 years ago at the site of present-day
Lake Toba in
Sumatra,
Indonesia. It is one of the
Earth's
largest known eruptions. The
Toba catastrophe theory holds that this
event caused a global volcanic winter of six to ten years and possibly a 1,000-year-long cooling episode.
...
The Toba eruption or Toba event occurred at the present location of
Lake Toba in
Indonesia, about 75000±900 years
BP according to
potassium argon dating.
[4] This eruption was the last and largest of four eruptions of Toba during the
Quaternary period, and is also recognized from its diagnostic horizon of ashfall, the youngest Toba
tuff.
[5] It had an estimated
volcanic explosivity index of 8 (the highest rating of any known eruption on Earth); it made a sizable contribution to the 100×30 km
caldera complex.
[6] Dense-rock equivalent (DRE) estimates of eruptive volume for the eruption vary between 2000 km3 and 3000 km3 – the most common DRE estimate is 2800 km3 (about 7×1015 kg) of erupted magma, of which 800 km3 was deposited as ash fall.
[7]
The erupted mass was 100 times greater than that of the largest volcanic eruption in recent history, the 1815 eruption of
Mount Tambora in Indonesia, which caused the 1816 "
Year Without a Summer" in the Northern Hemisphere.
[8] Toba's erupted mass deposited an ash layer of about 15 centimetres (5.9 in) thick over the whole of
South Asia. A blanket of volcanic ash was also deposited over the
Indian Ocean, the
Arabian Sea, and the
South China Sea.
[9] Deep-sea cores retrieved from the South China Sea have extended the known reach of the eruption, suggesting that the 2800 km3 calculation of the erupted mass is a minimum value or even an underestimate.
[10]
Volcanic winter and cooling computer models[edit]
Geologist
Michael R. Rampino and volcanologist Stephen Self argue that
the eruption caused a "brief, dramatic cooling or 'volcanic winter'", which resulted in a drop of the global mean surface temperature by 3–5 °C.[11] Evidence from
Greenland ice cores indicates a 1,000-year period of low
δ18O and increased dust deposition immediately following the eruption. The eruption may have caused this 1,000-year period of cooler temperatures (stadial), two centuries of which could be accounted for by the persistence of the Toba stratospheric loading.
[12] Rampino and Self believe that global cooling was already underway at the time of the eruption, but that the process was slow; Toba
tuff "may have provided the extra 'kick' that caused the climate system to switch from warm to cold states".
[13] Although Clive Oppenheimer rejects the hypothesis that the eruption triggered the last glaciation,
[14] he agrees that it may have been responsible for a millennium of cool climate prior to the 19th
Dansgaard-Oeschger event.
[15]
According to Alan Robock, who has also published
nuclear winter papers, the Toba eruption did not precipitate the last glacial period. However, assuming an emission of six billion tons of
sulphur dioxide,
his computer simulations concluded that a maximum global cooling of approximately 15 °C occurred for three years after the eruption, and that this cooling would last for decades, devastating life.
[16] Because the saturated
adiabatic lapse rate is 4.9 °C/1,000 m for temperatures above freezing,
[17] the
tree line and the
snow line were around 3,000 m (9,900 ft) lower at this time.[
where?] The climate recovered over a few decades, and Robock found no evidence that the 1,000-year cold period seen in Greenland ice core records had resulted from the Toba eruption. In contrast, Oppenheimer believes that estimates of a drop in surface temperature by 3–5 °C are probably too high, and he suggests that temperatures dropped only by 1 °C.
[18] Robock has criticized Oppenheimer's analysis, arguing that it is based on simplistic
T-forcing relationships.
[19]
Despite these different estimates, scientists agree that a supereruption of the scale at Toba must have led to very extensive ash-fall layers and injection of noxious gases into the atmosphere, with worldwide effects on weather and climate.
[20] In addition, the Greenland ice core data display an abrupt
climate change around this time,
[21] but there is no consensus that the eruption directly generated the 1,000-year cold period seen in Greenland or triggered the last glaciation.
[22]
This extended volcanic winter not only killed off much life, it also likely covered the planet in a cloud cover that obscured the sun for a time. And so I suspect that the First Chapter of Genesis is an oral tradition of what earl modern man experienced as the Earth recovered from this massive catastrophic darkness.
Also, the event may have caused some evolutionary pressure for modern man to develop complex language and sentence structure, making mankind capable of learning the concept of sin and guilt.