We have also replaced the manual thermometers with automated weather stations. The problem is that these have a maximum 50 ft. cable run. Where is outdoor electricity? Near air conditioners. And, what do air conditions vent? Hot air. Examples:
Here is a weather station in Georgia less than 9' from an air conditioner. You can see the old weather station in the background:
|The electronic thermometer is circled. It is less than 9 ft. from the air conditioner.|
|Courtesy: Roger Pielke, Sr.|
Watts Up With That has reported on a new paper that, apparently for the first time, explores the effect of instrument error on the world temperature record. Here is the key finding:
...the global surface air temperature anomaly trend from 1880 through 2000 is statistically indistinguishable from 0 C, and represents a lower limit of calibration uncertainty for climate models and for any prospective physically justifiable proxy reconstruction of paleo-temperature. The rate and magnitude of 20th century warming are thus unknowable, and suggestions of an unprecedented trend in 20th century global air temperature are unsustainable.
Here is a graph that shows the author's findings:
|The gray intervals represent instrument uncertainty. The red line indicates|
that it is possible (but not likely) there has been little or no "global warming."
I believe temperatures are warmer than in the 1970's. But, I believe the amount of warming as presented in the NASA, NOAA, and British data, since 1990, is inflated about about one quarter or one third.