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https://doi.org/10.5194/amt-2017-92
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
10 May 2017
Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Atmospheric Measurement Techniques (AMT).
Validation of 10-year SAO OMI Ozone Profile (PROFOZ) Product Using Aura MLS Measurements
Guanyu Huang1, Xiong Liu1, Kelly Chance1, Kai Yang2, and Zhaonan Cai1 1Harvard -Smithsonian Center for Astrophysics, Cambridge, MA, USA
2Department of Atmospheric and Oceanic Science, University of Maryland, College Park, Maryland, USA
Abstract. We validate the Ozone Monitoring Instrument (OMI) ozone profile (PROFOZ) product including ozone profiles between 0.22–261 hPa and Stratospheric Ozone Columns (SOCs) down to 100, 215, and 261 hPa from October 2004 through December 2014 retrieved by the Smithsonian Astrophysical Observatory (SAO) algorithm against the latest Microwave Limb Sound (MLS) v4.2x data. We also evaluate the effects of OMI row anomaly (RA) on the retrieval by dividing the data set into before and after the occurrence of serious RA, i.e., pre-RA (2004–2008) and post-RA (2009–2014). During the pre-RA period, OMI ozone profiles agree very well with MLS data. Tthe global mean biases (MBs) are within 3 % between 0.22–100 hPa and negative 3–9 % for lower layers, and the standard deviations (SDs) are 3.5–5 % from 1–40 hPa, 6–10 % for upper layers and 5–20% for lower layers, after applying OMI averaging kernels to MLS data. OMI shows latitude and solar zenith angle (SZA) dependent biases, but MBs and SDs are mostly within 10 % except for low/high altitudes of high latitudes/SZAs. During the post-RA period, OMI retrievals degrade slightly between 5–261 hPa with MBs and SDs typically larger by 2–5%, and degrade much more, with larger MBs by up to 8 % and SDs by up to 15% for pressure less than ~ 5 hPa, where the MBs are larger by 10–15 % south of 40 °N due to the blockage effect of RA and smaller by 15–20 % north of 40 °N due to the solar contamination effect of RA. The much worse comparison at high altitudes indicates the UV-1 channel of pixels that are not flagged as RA is still affected by the RA. During the pre-RA period, OMI SOCs show very good agreement with MLS data with global mean MBs within 0.6 % and SDs of 1.9 % for SOCs down to 215 and 261 hPa and of 2.30 % for SOC down to 100 hPa. Despite clearly worse ozone profile comparison during the post-RA period, OMI SOCs only slightly degrade, with SDs larger by 0.4–0.6 % mostly due to looser spatial coincidence criterion as a result of missing data from RA and MBs larger by 0.4–0.7 %. The retrieval comparison indicates significant bias trends, especially during the post-RA period. The spatiotemporal variation of the retrieval performance suggests the need to improve OMI’s radiometric calibration to maintain the long-term stability and spatial consistency of the PROFOZ product. The good comparison with SOC down to 261 hPa supports that MLS ozone at 261 hPa, recommended for further evaluation by the MLS team, is suitable for scientific use.

Citation: Huang, G., Liu, X., Chance, K., Yang, K., and Cai, Z.: Validation of 10-year SAO OMI Ozone Profile (PROFOZ) Product Using Aura MLS Measurements, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2017-92, in review, 2017.
Guanyu Huang et al.
Guanyu Huang et al.
Guanyu Huang et al.

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Short summary
In this paper, we focus on the validation of OMI ozone (PROFOZ) product in the stratosphere using MLS ozone observations. This paper, with its companion paper focusing on the validation in the troposphere by using global ozonesonde observations, provides us a comprehensive understanding of the data quality of OMI PROFOZ product and impacts of the “Row anomaly”.
In this paper, we focus on the validation of OMI ozone (PROFOZ) product in the stratosphere...
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