Global Warming, sea-level rise & the Vostok ice core record.

Global Warming, sea-level rise & the Vostok ice core record.

Postby Vostok » Wed Jul 28, 2010 6:36 pm

The following link provides a complete list of topics on this forum:

http://www.preearth.net/phpBB3/search.php?search_id=newposts


The Vostok ice core provides us with much information.

For example, here is the carbon dioxide concentration versus temperature record for the last 420,000 years;

Image

The carbon dioxide concentration is in parts per million (ppm).

The temperature is in degrees centigrade.

To emphasize the incredible correlation between the temperature and carbon dioxide concentration, it has been suggested that the two graphs of the image should be over-lapped as follows:

Image

The graphs show that if the 420,000 year trend continues, we are in for a massive temperature rise.

Indeed, this rise in temperature is already under way, as is verified by the following data from the National Oceanic and Atmospheric Administration (NOAA).

Image

The anomalies measure the difference from the 20th century average (1901-2000).

The 20th century average land+ocean surface temperature is 13.9 °C.
The 20th century average land surface temperature is 8.5 °C.
The 20th century average ocean surface temperature is 16.1 °C.

The data is from: ncdc.noaa.gov/monitoring-references/faq/anomalies.php

For a full listing of the 137 years of temperature records, see:

http://preearth.net/images/temp-anomalies-1880-2017.txt

The rise in average yearly land temperatures is particularly worrying (from 7.8725 °C in 1884, to 9.9357 °C in 2017).

So, why is the rise in temperatures so worrisome?

For one thing, as temperatures rise good farmland will become desert (e.g., dust-bowl conditions will probably return to the American Midwest).

Another major problem is sea-level rise.

Have a look at http://pubs.usgs.gov/fs/fs2-00/

The U.S. Geological Survey people claim that;

The Greenland ice sheet melting will raise sea-level 6.55 meters (21.5 feet),
the West Antarctica ice sheet melting will raise sea-level 8.06 meters (26.4 feet),
the East Antarctica ice sheet melting will raise sea-level 64.8 meters (212.6 feet),
and all other ice melting will raise sea-level 0.91 meters (3 feet).

For a grand total of 80.32 meters (263.5 feet).

So, what does an 80 meter (263 feet) rise in sea-level mean. Have a look at the following map of the world after an 80 meter rise.

Image

For a larger map see: http://www.preearth.net/images/after-melt-world.png

It means that over one billion people will have to be resettled to higher ground and that much of the most productive agricultural land will be under water. Fortunately, at current rates the Greenland ice sheet will take over a thousand years to melt and the Antarctica ice sheet, much longer. However, the greater the temperature rise the faster the ice sheets will melt, bringing the problem much closer. Remember, the huge ice sheet that recently covered much of North America, almost completely melted in only 15,000 years (today, only the Greenland ice sheet and some other small patches of it, remain). Since then (15,000 years ago), sea-levels have risen about 125 meters (410 feet), only 80 meters to go.

This is what Britain and Ireland will look like:

Image
Vostok
 

Re: The Vostok ice core records & global warming.

Postby preearth » Tue Apr 04, 2017 4:47 am

The following links point to detailed images of the world after the ice-caps have melted.

After the melt. 500m contours. China.
After the melt. 500m contours. Europe.
After the melt. 500m contours. North America.
After the melt. 500m contours. South America.
After the melt. 500m contours. Australia and New Zealand.
After the melt. 500m contours. Africa.

Here is one of them (100 times smaller):

Image

Here are some after-melt images which compare the new sea-shore to the old:

Image
Image

They are from newpapyrusmagazine.blogspot.com/2008/03/worse-case-scenario.html

For larger maps: here and here.

If you happen to be from New Zealand then visit: http://www.musther.net/nzslr/
preearth
 
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