Placement of Sensors Increases Temperature Readings

When it comes to the global warming hoax, it doesn’t matter what the temperature is; it matters where the sensors are. As sites like this one and Watts Up With That have pointed out for years, the increasing likeliness of sensors being located in an urbanized environment influences the perceived rise in temperature due to the heat sink effect. Cities get hotter and stay hotter at night because the pavement soaks up heat. That’s why you put the censors in parking lots if you want to get high temperature readings.

The feds are owning up to this. From a study involving NOAA’s National Centers for Environmental Information:

A field experiment was performed in Oak Ridge, TN, with four instrumented towers placed over grass at increasing distances (4, 30, 50, 124, and 300 m) from a built-up area. Stations were aligned in such a way to simulate the impact of small-scale encroachment on temperature observations. As expected, temperature observations were warmest for the site closest to the built environment with an average temperature difference of 0.31 and 0.24 °C for aspirated and unaspirated sensors respectively. Mean aspirated temperature differences were greater during the evening (0.47 °C) than day (0.16 °C). …

These results suggest that small-scale urban encroachment within 50 meters of a station can have important impacts on daily temperature extrema (maximum and minimum)…

Start with bad data from censors surrounded by asphalt, adjust it as necessary, hide the decline, and voilà: global warming.

On a tip from R F.

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