Posted 15 Feb 2005 on the Idsos' web site:
http://www.co2science.org/scripts/Te....jsp?Page=data
/ushcn/stationoftheweek
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* USHCN Temperature Record of the Week: Canon City, CO
*
* To bolster our claim that "There Has Been No Net Global
* Warming for the Past 70 Years," each week we highlight the
* temperature record of one of the 1221 U.S. Historical
* Climatology Network (USHCN) stations from 1930-2000.
*
* This issue's temperature record of the week is from Canon
* City, Colorado. During the period of most significant
* greenhouse gas buildup over the past century, i.e., 1930 and
* onward, Canon City's mean annual temperature has cooled by
* 1.70 degrees Fahrenheit. Not much global warming here!
************************************************** ***********
Canon City, CO 38.400N, 105.217W, elevation 5330 feet
The Idsos' graph indicates lots of missing data, especially near
the beginning around 1940 and at the end between 1980 and 2000.
Once again, we find changes in location, with the station first
located 1 mile west of Canon City at the State Penitentiary from
1905 until 1983, then a move 2 miles SE in 1985. The
Penitentiary is located next to a main U.S. highway and is likely
to have lots of hard concrete and stone. There is a steep ridge
which rises about 1000 high just to the west of the Penitentiary
which would shield the site from colder winds from the north and
west. The latest site appears to be out of town in a newer area
with a low density suburban environment. I suggest this
situation is an example of a reverse Heat Island Effect.
Along with the changes in location, the observation times were
changed. From 1930 until 1959, the observations were taken at
5PM, then at 4PM until 1970. From 1970 until 1985, the
observation time was 7AM. After that, the observations were
taken at 9AM. Thus, there is likely to be a cooling bias due
simply to the shift in observation time.
--
Eric Swanson --- E-mail address: e_swanson(at)skybest.com :-)
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