Abstract
Abstract. A newly upgraded German Weather Service (DWD) ozone and temperature lidar (HOH) located at the Hohenpeißenberg Meteorological Observatory (47.8∘ N, 11.0∘ E) has been evaluated through comparison with the travelling standard lidar operated by NASA's Goddard Space Flight Center (NASA GSFC Stratospheric Ozone (STROZ) lidar), satellite overpasses from the Microwave Limb Sounder (MLS), the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER), the Ozone Mapping and Profiler Suite (OMPS), meteorological radiosondes launched from Munich (65 km northeast), and locally launched ozonesondes. The “blind” evaluation was conducted under the framework of the Network for the Detection of Atmospheric Composition Change (NDACC) using 10 clear nights of measurements in 2018 and 2019. The campaign, referred to as the Hohenpeißenberg Ozone Profiling Study (HOPS), was conducted within the larger context of NDACC validation activities for European lidar stations. There was good agreement between all ozone lidar measurements in the range of 15 to 41 km with relative differences between co-located ozone profiles of less than ±10 %. Differences in the measured ozone number densities between the lidars and the locally launched ozone sondes were also generally less than 5 % below 30 km. The satellite ozone profiles demonstrated some differences with respect to the ground-based lidars which are due to sampling differences and geophysical variation. Both the original and new DWD lidars continue to meet the NDACC standard for lidar ozone profiles by exceeding 3 % accuracy between 16.5 and 43 km. Temperature differences for all instruments were less than ±5 K below 60 km, with larger differences present in the lidar–satellite comparisons above this region. Temperature differences between the DWD lidars met the NDACC accuracy requirements of ±1 K between 17 and 78 km. A unique cross-comparison between the HOPS campaign and a similar, recent campaign at Observatoire de Haute-Provence (Lidar Validation NDACC Experiment; LAVANDE) allowed for an investigation into potential biases in the NASA-STROZ reference lidar. The reference lidar may slightly underestimate ozone number densities above 43 km with respect to the French and German NDACC lidars. Below 20 km, the reference lidar temperatures profiles are 5 to 10 K cooler than the temperatures which are reported by the other instruments.
Highlights
The Network for the Detection of Atmospheric Composition Change (NDACC; http://www.ndaccdemo.org/, last access: 3 November 2020) is an international collaboration of more than 70 research stations (Kurylo et al, 2016; De Mazière et al, 2018) which provides a common framework for the early detection of long-term changes in the atmo-Published by Copernicus Publications on behalf of the European Geosciences Union.R
A previous NDACC validation campaign (HOPE; Steinbrecht et al, 2009) found a low bias in the ozone profiles produced by the Hohenpeißenberg Original (HOHO) lidar between 33 and 43 km by up to 10 % and a high bias of approximately 50 % above 50 km when compared with the travelling standard lidar operated by NASA-STROZ
The Hohenpeißenberg Ozone Profiling Study (HOPS) campaign took place in October 2018 and March/April 2019 with the dual purpose of providing an updated validation of the existing DWD ozone lidar, hereafter referred to as Hohenpeißenberg Original (HOHO), which has been in continuous operation since September 1987 and a first validation study for the new and improved DWD ozone lidar, hereafter referred to as the Hohenpeißenberg lidar (HOH)
Summary
The Network for the Detection of Atmospheric Composition Change (NDACC; http://www.ndaccdemo.org/, last access: 3 November 2020) is an international collaboration of more than 70 research stations (Kurylo et al, 2016; De Mazière et al, 2018) which provides a common framework for the early detection of long-term changes in the atmo-. R. Wing et al.: HOPS intercomparison for ozone and temperature lidars at Hohenpeißenberg sphere and validation of atmospheric measurements. Wing et al.: HOPS intercomparison for ozone and temperature lidars at Hohenpeißenberg sphere and validation of atmospheric measurements To facilitate these instrument validation exercises, a mobile reference lidar operated by NASA’s Goddard Space Flight Center (NASA GSFC Stratospheric Ozone (STROZ) lidar) is shipped around the world to conduct intensive comparison campaigns with other NDACC lidars. When providing context for Hohenpeißenberg Ozone Profiling Study (HOPS) campaign, we will refer back to the 2017– 2018 LAVANDE campaign (Wing et al, 2020) and the previous validation campaign at Hohenpeißenberg called HOPE (Hohenpeißenberg Ozone Profiling Experiment) (Steinbrecht et al, 2009). NDACC lidars measure stratospheric ozone with an accuracy better than 3 % between 12 and 35 km altitude and better than 10 % between 35 and 42 km. Further details on the theoretical uncertainty budgets for NDACC temperature and ozone lidars can be found in Leblanc et al (2016a, b, c)
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