Table 3.
Linear correlation between HCHO total columns from Pandora direct-sun measurements and columns calculated from in situ surface concentration measurements based on different profile shape assumptions (Y) vs. HCHO-integrated columns from DC-8 (X).
| VCD source | Profile shape | Slope | Intercept | R2 | N |
|---|---|---|---|---|---|
| In situ1 (ground up) | Box: measured MLH | 0.99 ± 0.18 | −0.11 ± 0.12 | 0.69 | 49 |
| Box + exponential: measured MLH | 1.13 ± 0.25 | 0.00 ± 0.17 | 0.62 | 49 | |
| Box: median MLH | 0.71 ± 0.17 | 0.05 ± 0.11 | 0.55 | 57 | |
| Box + exponential: median MLH | 1.07 ± 0.25 | 0.02 ± 0.16 | 0.48 | 58 | |
| Pandora2 | n/a | 1.16 ± 0.23 | 0.22 ± 0.16 | 0.68 | 49 |
1
All measurements are averaged over 5 min intervals.
2
Pandora measurements are filtered based on the maximum relative instrumental/atmospheric HCHO column error of 15% and maximum normalized residual rms of 0.002. n/a – not applicable