Experiment config on July 13th. The screens were subsequently moved further apart. Note aspirated air temperature reference in forground.
I’ve been sorting through some of the data, and have found many similarities with many days of data. So I thought I’d present a typical day from this summer. The is 8/27/07, exactly one month after I started the experiment data logging.
I chose to show this day for starters because I can be certain that the whitewash was fully cured and no “newness effects” related to the conversion of CaOH to CaCO3 would remain. Whitewash cures by chemical reaction with air, not by drying.
First here is a 24 hour plot of the raw data, at 15 second sampling intervals, note that it gets noisy on the way to Tmax due to afternoon winds about 5-10 mph. Another factor for noises is that the response time of the NIST calibrated thermistors is fairly fast, in seconds.
Full size graph: paint-test-082707-raw.png
Since it is harder to visually determine separate Tmax and Tmin with noisy data, I ran it though a data smoothing algorithm to produce this plot.
Full size graph: paint-test-082707-smoothed.png
Here is the report from my data plotter on peaks for this graph:
Minimum = 55.38 at X = 8/27/2007 6:52:48 AM
Maximum = 95.04 at X = 8/27/2007 3:40:50 PM
Minimum = 56.22 at X = 8/27/2007 6:54:35 AM
Maximum = 96.94 at X = 8/27/2007 3:43:07 PM
Minimum = 55.92 at X = 8/27/2007 6:40:25 AM
Maximum = 97.74 at X = 8/27/2007 3:42:06 PM
Minimum = 56.36 at X = 8/27/2007 6:39:24 AM
Maximum = 98.47 at X = 8/27/2007 3:42:36 PM
Since in regular use, COOP/USHCN stations report their daily max and min to NCDC for inclusion in the climatic database, I have provided zoomed graphs on the Tmax and Tmin periods.
Here is the zoomed Tmax graph:
Full size graph: paint-test-082707-tmaxzoom.png
And here is the zoomed Tmin graph:
Full size graph: paint-test-082707-tminzoom.png
As a secondary reference besides my own aspirated air temperature, I’m fortunate to have a CDF RAWS station within about 200 yards, on similar terrain and ground cover. It has a non-aspirated shield, and also has wind, and solar radiation among other sensors.
Here is the temperature plot from it:
Full size graph: temp-chi-raws-082707.png
A complete suite of plots, including wind and solar radiation in watts/m2 can be had from the CDEC data query web page.
As I wade though this data, I’ll be publishing additional days, and more detailed analyses, followed by a final report that covers everything that I’ve learned.
In the spring of 2008, I’ll be repeating this experiment at a slightly different location, there is a late afternoon bias for tree shading to the west that I want to remove from the experiment.
I’ll remind all readers that this is a single day, and that conclusions should not be drawn from it as it represents a single data point for Tmax/Tmin. Please be patient while I do further analysis.