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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Volume 11, issue 5 | Copyright
Atmos. Meas. Tech., 11, 2837-2861, 2018
https://doi.org/10.5194/amt-11-2837-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 16 May 2018

Research article | 16 May 2018

Validation of ozone profile retrievals derived from the OMPS LP version 2.5 algorithm against correlative satellite measurements

Natalya A. Kramarova1, Pawan K. Bhartia1, Glen Jaross1, Leslie Moy2, Philippe Xu3, Zhong Chen2, Matthew DeLand2, Lucien Froidevaux4, Nathaniel Livesey4, Douglas Degenstein5, Adam Bourassa5, Kaley A. Walker6, and Patrick Sheese6 Natalya A. Kramarova et al.
  • 1NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
  • 2Science Systems and Applications, Inc., Lanham, Maryland, USA
  • 3Science Applications International Corp., Beltsville, Maryland, USA
  • 4Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA
  • 5University of Saskatchewan, Saskatoon, Saskatchewan, Canada
  • 6Department of Physics, University of Toronto, Toronto, Ontario, Canada

Abstract. The Limb Profiler (LP) is a part of the Ozone Mapping and Profiler Suite launched on board of the Suomi NPP satellite in October 2011. The LP measures solar radiation scattered from the atmospheric limb in ultraviolet and visible spectral ranges between the surface and 80km. These measurements of scattered solar radiances allow for the retrieval of ozone profiles from cloud tops up to 55km. The LP started operational observations in April 2012. In this study we evaluate more than 5.5 years of ozone profile measurements from the OMPS LP processed with the new NASA GSFC version 2.5 retrieval algorithm. We provide a brief description of the key changes that had been implemented in this new algorithm, including a pointing correction, new cloud height detection, explicit aerosol correction and a reduction of the number of wavelengths used in the retrievals. The OMPS LP ozone retrievals have been compared with independent satellite profile measurements obtained from the Aura Microwave Limb Sounder (MLS), Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) and Odin Optical Spectrograph and InfraRed Imaging System (OSIRIS). We document observed biases and seasonal differences and evaluate the stability of the version 2.5 ozone record over 5.5 years. Our analysis indicates that the mean differences between LP and correlative measurements are well within required ±10% between 18 and 42km. In the upper stratosphere and lower mesosphere (>43km) LP tends to have a negative bias. We find larger biases in the lower stratosphere and upper troposphere, but LP ozone retrievals have significantly improved in version 2.5 compared to version 2 due to the implemented aerosol correction. In the northern high latitudes we observe larger biases between 20 and 32km due to the remaining thermal sensitivity issue. Our analysis shows that LP ozone retrievals agree well with the correlative satellite observations in characterizing vertical, spatial and temporal ozone distribution associated with natural processes, like the seasonal cycle and quasi-biennial oscillations. We found a small positive drift ∼0.5%yr−1 in the LP ozone record against MLS and OSIRIS that is more pronounced at altitudes above 35km. This pattern in the relative drift is consistent with a possible 100m drift in the LP sensor pointing detected by one of our altitude-resolving methods.

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The Ozone Mapping and Profiler Suite (OMPS) Limb Profiler (LP) is a newly designed research sensor aiming to continue high vertical resolution ozone records from space-borne sensors. In summer 2017 all LP measurements were processed with the new version 2.5 algorithm. In this paper we provide a description of the key changes implemented in the new algorithm and evaluate the quality of ozone retrievals by comparing with independent satellite profile measurements (MLS, ACE-FTS and OSIRIS).
The Ozone Mapping and Profiler Suite (OMPS) Limb Profiler (LP) is a newly designed research...
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