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Following the SCP project, we tested each sonic in a zero-wind enclosure within the EOL temperature chamber, measuring wind component offsets and sonic temperature errors over the nominal range -30 C to 55 C. The following table shows wind component offsets as okay if the u and v offsets are less than +/- 4 cm/s and the w offsets less than +/- 2 cm/s (between - 20 C and 30 C). The sonic temperature corrections are listed as the slope and offset of a linear fit (between -20 C and 30 C), tc.sonic Tc = offset + slope*Tctc.sonic, where Tc is calculated from temperature, relative humidity, and pressure measured in the zero-wind enclosure.
Sonic | Location | Cal date | u | v | w | tc offset | tc slope |
|---|---|---|---|---|---|---|---|
0200 | c.1m | 6/27/12 | ok | ok | ok | -0.04 | 1.98120192 |
0197 | c.2m | 7/3/12 | ok | ok | ok | - 0.74 | 1 0.01019900 |
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