Abstract
Abstract. A one-time-calibrated (in December 2013) Pandora spectrometer instrument (Pan #034) has been compared to a periodically calibrated Dobson spectroradiometer (Dobson #061) co-located in Boulder, Colorado, and compared with two satellite instruments over a 3-year period (December 2013–December 2016). The results show good agreement between Pan #034 and Dobson #061 within their statistical uncertainties. Both records are corrected for ozone retrieval sensitivity to stratospheric temperature variability obtained from the Global Modeling Initiative (GMI) and Modern-Era Retrospective analysis for Research and Applications (MERRA-2) model calculations. Pandora #034 and Dobson #061 differ by an average of 2.1 ± 3.2 % when both instruments use their standard ozone absorption cross sections in the retrieval algorithms. The results show a relative drift (0.2 ± 0.08 % yr−1) between Pandora observations against NOAA Dobson in Boulder, CO, over a 3-year period of continuous operation. Pandora drifts relative to the satellite Ozone Monitoring Instrument (OMI) and the Ozone Mapping Profiler Suite (OMPS) are +0.18 ± 0.2 % yr−1 and −0.18 ± 0.2 % yr−1, respectively, where the uncertainties are 2 standard deviations. The drift between Dobson #061 and OMPS for a 5.5-year period (January 2012–June 2017) is −0.07 ± 0.06 % yr−1.
Highlights
A Pandora spectrometer instrument #034 (PSI, Pan #034) located on top of the NOAA building in Boulder, Colorado, has been operating since December 2013 with little maintenance and using the original calibration
Additional comparisons are made with satellite overpass data from OMI (Ozone Monitoring Instrument on board the Aura spacecraft) and OMPS (Ozone Mapping Profiler Suite on board the Suomi NPOESS satellite)
The results demonstrate the accuracy and stability of both the Dobson and PSI for retrieval of total column ozone (TCO) and serve as a validation demonstration at one location for both the fairly new PSI and for satellite ozone data from OMI and OMPS
Summary
A Pandora spectrometer instrument #034 (PSI, Pan #034) located on top of the NOAA building in Boulder, Colorado, has been operating since December 2013 with little maintenance and using the original calibration. The main sources of noise in the PSI measurement comes from the presence of clouds or haze in the FOV, which increases the exposure time needed to fill the CCD wells to 80% and reduces the number of measurements in 30 s For this comparison study, data were selected for scenes under clear-sky conditions as determined from the Dobson A–D pair direct-sun data record. The Dobson data used in this study contain the individual measurements (more than one per day between 09:00 and 15:00 local time (LT) with almost all of the data between 10:00 and 14:00 LT) for clear-sky direct-sun observations using the quartz plate and A–D wavelength pairs for ozone retrieval (Dobson label ADDSGQP) These were made available by one of the co-authors The NOAA Dobson total ozone data are typically archived at WOUDC (World Ozone and Ultraviolet Radiation Data Centre) or NDACC (Network for the Detection of Atmospheric Composition Change) with one representative ozone value per day
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