Temperature Calibration Notes

These are my rough notes. The slope values are pretty much meaningless. The scatter is the standard deviation of each calibration period and level group, no outliers removed. The figures indicated are working figures (like Figure 1.), that I used for my analyses. They do not refer to the figures on these www pages. Bias is median value of difference. Scatter is standard deviation of difference between hazer and adjacent level Slope = ? means not enough variation to determine Slope = * means there was a slope but it was believed due to random factors or wind speed effects NE = no calibration available, based on neutral + extrapolations Bottom hazer vs level 2 (figures 13,14) Var Pe Bias Slope Scat Comments t 1 -0.050 0 0.0131 Very consistent, little scatter t 2 -0.05 NE t 2.5 -0.06 NE t 3 -0.025 NE t 4 0.030 ? 0.0893 Large scatter, No ws rwd effect t 5 -0.010 ? 0.0180 Consistent (cluster ~0 suggest no correction) t 6 0.040 ? 0.0546 Some scatter B closer to 0 at higher winds radiation effects? Bottom hazer vs level 3 (figures 15,16) t 1 0 * 0.0366 Some positive slope but considered due to random effects t 2 -0.02 ? 0.6383 Very large scatter (max 3 deg) at low winds, radiation effect? Calibration period median bias was -0.05 Bias ~0 and low scatter at higher winds suggest no correction Decided to go with bias =-.02 which matches nearby NE cases t 2.5 -0.02 NE t 3 0.005 * 0.0844 Some negative slope considered random. Bias essentially 0. t 4 0 ~0 0.04 Good agreement t 5 0.05 ~0 0.0157 Consistently above zero difference t 6 0.06 ? 0.0095 Tight little group Bottom hazer vs level 4 (figures 17,18) bias = bottom(1) - 4 t 1 -0.06 * 0.25 Large scatter due to just two points; most points clustered around the bias value t 2 -0.07 NE t 2.5 -0.05 NE t 3 -0.02 ? 0.0652 Cluster around -0.04 t 4 -0.04 ~0 0.0622 Scatter not explained by ws or rwd effects t 5 -0.02 ? 0.0214 Nice tight group t 6 -0.03 ~0 0.0302 Moderate scatter ottom hazer vs top hazer (1st figures 3) bias = bottom - top t 1 0.17 * 0.4428 One bad point affected scatter, generally tight group t 2 0.14 NE t 2.5 -0.01 NE Large drop from earlier obvious timing of drop uncertain t 3 0.08 * 0.0222 Nice tight group t 4 -0.02 * 0.0829 Moderate scatter mostly occuring during low winds t 5 0.11 ? 0.0161 Nice tight group t 6 0.11 NE Top hazer vs level 4 (2nd figures 3) bias = top - 4 t 1 -0.23 * 0.1292 Good cluster around bias, large scat due to one outlier t 3 -0.11 * 0.0475 Tight group around bias, a few outliers t 4 0 * 0.0861 Quite large scatter especially at low winds t 5 -0.13 0.0239 Nice tight group The large gap in the area between JD 300-500 was filled in based on low heat flux, high wind extrapolation comparisons Periods 2 and 3 for most of heights were determined this way. A new period, period "2.5" was designated for the time JD=425 for all periods. Suggest linear interpolations between these points. In reality there were probably jumps, a linear interpolation gives smoother results. Temperature conclusions Slope effects (i.e. difference = f(t)) not important - all errors can be considered a bias Top hazer consistently too low (except around JD 508) when compared to level 4 or bottom hazer even when adding 0.02 C to account for 2 m elevation difference Top Hazer comparisons with 1 and 4 are consistent with 1 vs 4 comparisons Other trends difficult to interpret. (See Figure 6)

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Last update: 4/20/99

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