Permafrost not so permanent anymore

There's lots of things in this old world that are not as firm as they used to be... Just saying.


The perma frost within that study says it is 2.6 million years old, which is about the time we want below 2.5-3c warmer then today within some studies I've read and others like hansen believe it is closer to 1.5-2c.

Given the inate complexity of permafrost, either party may be correct. Still, the ice goes at least 1.5 million years, and, possibly, 2.6. Good scientific debate will be around for a while, until more definate data is collected and interpreted. What makes science fun.
 
Oh please. Most of the permafrost that is extent is younger then 15,000 years. The oldest is around 500,000 years old in the deepest polar regions. I thinks 35,000 years is the record for Alaska though that may have changed in the last 20 years or so. Regardless, for most of Earths history there was no permafrost.

Yet more attempts to frighten the savages. So sad for you the savages no longer believe your BS.

Can you please post a link to the information for the permaforst. Thank you.



Here are a few and this is what NOAA has to say about it....



Land - Permafrost






Roads | Permafrost | Tundra | Rivers | Waterfowl | Caribou

See the annually updated Arctic Report Card essay on Permafrost!









Permafrost distribution in the Northern Hemisphere. Pink is continuous, blue is discontinuous, green is sporatic. [From Romanovsky et. al., 2002, Fig. 1]


Permafrost is permanently frozen ground. For example, in Fairbanks, Alaska, the soil is frozen just some 30 to 40 centimeters below the surface, and in fact, has been frozen for the last several thousand years and maybe even longer. Only the upper 30 to 100 cm of soil (called the active layer) thaws every summer and then completely refreezes during the winter. Typical thickness of permafrost around Fairbanks is about 50 meters, but varies between a few meters and 150 m and more. Permafrost gets colder and thicker northward. On the Alaskan Arctic Plain, permafrost could be as cold as -9 to -11°C cold and up to 650 meters thick.

When permafrost degrades (melts), there are impacts on drainage, ground water, river runoffs, ecological systems (such as plants and ponds), release of carbon that has been sequestered in the frozen soil, and infrastructure (such as houses, roads, airports, pipelines, and other facilities based on permafrost).

Average temperature during the year is the most important factor for permafrost existence. Permafrost temperatures at 1 m below ground in central Alaska have been warming since the 1960s and were reaching near to the melting point in the mid-1990s. There has been a retreat to colder temperatures (less than -1°C) in the last few years.









Arctic Change - Land: Permafrost

Permafrost: Facts, Discussion Forum, and Encyclopedia Article

SOTC: Permafrost
 
By the graph in the site, started warming again after 1998. While the permafrost in Sibera has been warming, sawtoothed fashion, since 1960.

The Russian Academy of Science just published a report in which they predict the Siberian permafrost area will be only 70% of it's present size by mid-century.
 

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