Ozone Comparison between Pandora #34, the Dobson #061, OMI, and OMPS at Boulder Colorado for the period December 2013 – June 2016. J. Herman, R Evans, A. Cede, N. Abuhassan, I. Petropavlovskikh, and G. McConville Pandora is small spectrometer system measuring between 290 and 530 nm with 0.5 nm resolution. O3, SO2, HCHO, NO2 – Total Column and Profiles

Dobson Spectroradiometer Use only AD-DSGQP measurement (A–D pair wavelengths direct sun using a ground quartz plate for clear-sky conditions)

Typical Pandora O3 Measurements Every 80 Seconds

Ozone Annual Cycle Boulder Colorado

+

AURA - OMI

+

Summary Pandora + Instrument Mean Offest (DU) Mean Offset (%) Slope (DU/Year) Slope (%/Year) OMI Pan34 0.5 ± 7 0.3 1.2 ± 0.4 0.4 OMPS 5 ± 15 1.6 1.0 ± 0.4 Dobson(BP) 2.7 ± 6 0.8 2.0 ± 0.2 0.6 Dobson(BDM) 5 ± 6 2.2 ± 0.2 0.7 SBUV19 3 ± 11 1.0 1.3 ± 0.9 Mean 2.8 ± 5 1.1 1.7 ± 0.3

Summary Dobson (BP) + Instrument Mean Offest (DU) Mean Offset (%) Slope (DU/Year) Slope (%/Year) OMI Dobson 2.4 ± 6 -0.8 -1.4 ± 0.3 0.4 OMPS 3 ± 7 1.0 -1.6 ± 0.3 -0.5 Pan34 -2.7 ± 6 -2.0 ± 0.2 -0.7 SBUV 0.3 ± 10 DU 0.1 -1.6 ± 1.0 Mean 0.8 -0.1 -1.7 -0.3

Summary Dobson (BDM) + Instrument Mean Offest (DU) Mean Offset (%) Slope (DU/Year) Slope (%/Year) OMI Dobson -4.9±6 -1.5 -1.6 ± 0.3 -0.5 OMPS 0.08 ± 8 0.03 -1.8 -0.6 Pan34 -5 ± 6 -1.6 -2.2 ± 0.2 -0.7 SBUV -2 ± 10 -1.7 ± 1 Mean -2.9 -0.9