FEAR of global warming is a preoccupation of western societies at the beginning of this 21st century. This fear is usually explained in terms of changes in the surface temperature of the earth as averaged from varying numbers of thermometers from around but the world. But given the many disputes concerning how this data is collected, compiled, adjusted and averaged (see notes and links below), it would perhaps be better if there was some agreement to focus on the temperature as measured from one or just a few sites.
Tim Curtin has suggested that as carbon dioxide concentrations are reported for Mauna Loa, Hawaii, why not also focus primarily on this site when discussing global warming?
Notes and Links
Christopher Essex et al 2006 have argued the concept of an average global temperature is meaningless: http://www.climatepolice.com/GlobalTemp.pdf
But the earth does warm and cool, so the issue is perhaps how the change and magnitude of the change might be best measured.
Michael Hammer after studying the official data from the US official weather stations, and in particular how it is adjusted after it has been collected, has concluded that the temperature rise profile claimed by the US government is largely if not entirely an artifact of the adjustments applied after the raw data is collected from the weather stations.
Tom Quirk comments on how surprisingly similar the calculated mean temperature is:
Meteorologist, Anthony Watts, has documented evidence of official weather stations recording artificially high temperatures because of the changing environments in which they exist, for example, new asphalt, new building or new air conditioning outlets.
Ross McKitrick from Canada’s University of Guelph has argued that 50 percent of global warming measured by land-based thermometers in the US since 1980 is due to local influences of man-made structures, also known as The Urban Heat Island Effect.
Bill Kininmonth, former head of Australia’s Bureau of Meteorology’s National Climate Centre, has suggested that because of the difficulty of assessing surface temperatures over ice surfaces it is more realistic to consider sea surface temperatures in places like the south pole and exclude areas of seasonal sea ice.
Roy Spencer and others use Microwave Sounding Units (MSUs) on orbiting satellites to measure lower atmosphere temperatures.
EM Smith has suggested that the anthropogenic global warming (AGW) “signal” is an artifact of the arrival and departure of thermometers from the scribal record: the addition of more thermometers in the Southern Hemisphere followed by the loss of Siberian thermometers with the collapse of the Soviet Union. http://jennifermarohasy.com/blog/2009/08/agw-is-a-thermometer-count-artifact-a-note-from-e-m-smith/
Mauna Loa is one of the Earth’s most active volcanoes having erupted 33 times since 1843, I guess these eruptions will have some impact at times on local temperature.