How not to measure temperature, part 51.

While we’ve taken some detours looking at some of the amazing things that have happened globally for temperature in January, with another detour to the sun, our www.surfacestations.org volunteers continue their mission.

This NOAA USHCN climate station of record #415018 in Lampasas, TX was found to be tucked between a building, and two parking lots, one with nearby vehicles. According to the surveyor, it is right next to the ACE Hardware store on the main street of town. While likely representative of the temperature for downtown Lampasas, one wonders how well it measures the climate of the region.

View looking NE

In her survey, volunteer surveyor Julie K. Stacy noted the proximity to the building and parking, which will certainly affect Tmin at night due to IR radiance. Daytime Tmax is likely affected by the large amount of asphalt and concrete in the area around the sensor. The main street of the town (28 ft from US 183) and the ACE Hardware parking lot are visible in this photo below:

View looking south

Google Earth shows just how much asphalt and buildings there are around the sensor.

According to NCDC’s MMS database, the Lampasas climate station has been at this location since 10-01-2000.Previous location was an observer residence, which appears to have been a park-like location according to MMS location map. The sensor was apparently converted to the MMTS style seen in the photo in 1986, so the move did not include an equipment change. See the complete survey album here.

But the big surprise of just how bad this location is came from the NASA GISS plot of temperature. It clearly showed the results of the move to this location, causing a jump in temperature almost off the current graph scale. Note that before the move, the temperature trend of Lampasas was nearly flat from 1980-2000.

Click to see the full sized GISS record

Given the entropy of the measurement environment, I have sincere doubts that anyone can create an adjustment that will ascertain an accurate trend from temperature data as badly polluted as this. In my opinion, this station’s post 2000 data needs to be removed from the climate record. 

UPDATE:

Since there has been some discussion about how well “adjustments” take care of such problems, I thought I’d show you just how well the GISS homogeneity adjustment works with this station.

Here is the GISS plot for Lampasas, TX with the GISS homogeneity applied, I’ve changed the color to red and labeled it to keep them visually separate from the raw data shown in the plot above.

click the plot to see the original plot from GISS

Now here is the GISS raw data plot with the homogeneity plot overlaid on it:

The effect is quite clear. The recent “spurious” measurement remains unchanged, and the past gets colder.

The result? An artificial warming trend for this station that is created by GISS adjustments.