Some on-line info, with a caveat or two
Posted by Caroline on May 30, 1998 at 22:44:25:
In response to Weather records: Help!, written by Linden on May 28, 1998 at 20:06:19
Here's a start-an on-line source that deals with how to assess climatic change over the last six centuries.On this chart, NH means average annual global temperatures ,Solar is a measure of the intensity of the sun's radiation, log CO2 is the amount of Carbon dioxide in the air and DVI is the amount of dust (volcanic aerosols and the like) in the air. The bottom is a generalised extrapolation of the global temps from 1700 to 1900, and you can see that the early 1800's were quite cool. If the temp range looks small and insignificant to you, remember that the period we are now in (the warmest since 1400 or so) is only one or two degrees warmer than this , and that another degree of warming will sufficiently melt the icecaps that New York City, London, San Francisco and most of the worlds great cities will be permanantly aquatic!
If you go to fig 6 on this site you will see isothermal maps for 1791 and 1816, valued against the norms of the late twentieth century.
I don't have permission to reproduce any of the maps and diagrams at this site, and I hope the owners will forgive the liberty in the interests of passing on knowledge! I seriously recommend that if you are interested in the subject that you read the whole site very thoroughly.
- Maundering Ken 08:15:17 6/01/98 (2)
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