TOLNET – A Tropospheric Ozone Lidar Profiling Network for Satellite Continuity and Process Studies

Newchurch, M. J.; Kuang, Shi; Leblanc, Thierry; Alvarez, R. J.; Langford, A. O.; Senff, Christoph J.; Burris, J.; McGee, Thomas J.; Sullivan, John T.; DeYoung, Russell J.; Al-Saadi, J. A.; Johnson, Matthew S.; Pszenny, Alex

doi:10.1051/epjconf/201611920001

Cited by 15 publications

(11 citation statements)

References 8 publications

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“…Ozone measurements have been mostly limited to Haute Provence, Garmisch-Partenkirchen and Athens. By contrast, the ozone-lidar network TolNET was implemented in North America (Newchurch et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

“…By contrast, more and more ozone lidar systems have even been shut down. Opposite to this development, recently a Tropospheric Ozone Lidar Network (TOLNet, https://www-air.larc.nasa.gov/missions/ TOLNet/) with seven lidar stations was established in North America (e.g., Newchurch et al, 2016;Wang et al, 2017;. It is important to note that even vertical profiles from the impressive MOZAIC (Measurements of Ozone and Water Vapor by Airbus In-Service Aircraft) (Marenco et al, 1998) data base are not able to resolve the fine-scale temporal variability of the vertical distribution of trace constituents because of the rather confined time slots for the aircraft departures and arrivals at the individual airports.…”

Section: Introductionmentioning

confidence: 99%

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Three Decades of Tropospheric Ozone Lidar Development at Garmisch-Partenkirchen

Trickl¹,

Giehl²,

Neidl³

et al. 2020

Preprint

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Abstract. Since 1988 two ozone lidar systems have been developed at IMK-IFU (Garmisch-Partenkirchen, Germany). A stationary system, operated at the institute, has yielded about 5000 vertical profiles of ozone from next to the ground to typically 3 km above the tropopause and has contributed data for a large number of scientific investigations. A mobile system was successfully operated in a number of field campaigns after its completion in 1996, before it was destroyed in major flooding in May 1999. Both systems combine a high data quality with high vertical resolution dynamically varied between 50 m in the lower troposphere and 250–500 m below the tropopause (stationary system). The stationary system has been gradually upgraded over the years. The noise level of the raw data has reached a level of about ±1 × 10-6 of the input range of the transient digitizers after minor smoothing. As a consequence, uncertainties of the ozone mixing ratios of 1.5 to 4 ppb have been achieved up to about 5 km. The performance in the upper troposphere, based on the wavelength pair 292 – 313-nm varies between 5 and 15 ppb, depending on the absorption of the 292-nm radiation in ozone and the solar background. In summer it is, therefore, planned to extend the measurement time for 41 s to a few minutes in order to improve the performance. For longer time series automatic data acquisition has been used. The number of measurements per year has been confined to less than 600 since fully automatic data evaluation has, still, had its limitations and some manual actions are needed.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Three Decades of Tropospheric Ozone Lidar Development at Garmisch-Partenkirchen

Trickl¹,

Giehl²,

Neidl³

et al. 2020

Preprint

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“…Previous studies also reported on tropospheric O 3 retrievals from the Tropospheric Emission Spectrometer (TES) and Infrared Atmospheric Sounding Interferometer (IASI), both sensors operating in the thermal infrared spectral range (Oetjen et al, 2016, and references therein). However, the recent study by Neu et al (2017) pointed out substantial differences in the tropospheric O 3 columns derived from different satellite instruments by up to 23%. Therefore, adequate means to accurately monitor the tropospheric O 3 columns from groundbased remote sensing techniques are needed for the validation of the satellite products and/or model simulations.…”

Section: Introductionmentioning

confidence: 99%

“…The differential absorption lidar (Browell, ) is the state‐of‐art technology to routinely measure vertical profiles of O 3 in an altitude range up to the tropopause with a high spatial and time resolution. A Tropospheric Ozone Lidar profiling Network (TOLNet) with six stations has been built in the United States in order to generate consistent and long‐term data sets (Newchurch et al, ). However, the wide usage of this technique is also limited by the high costs of the instruments and their operation.…”

Section: Introductionmentioning

confidence: 99%

Vertical Profiles of Tropospheric Ozone From MAX‐DOAS Measurements During the CINDI‐2 Campaign: Part 1—Development of a New Retrieval Algorithm

et al. 2018

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Ground‐based measurements of tropospheric ozone (O3) are valuable for studies of atmospheric chemistry, air pollution, climate change, and for satellite validation. The Multi Axis Differential Optical Absorption Spectroscopy (MAX‐DOAS) technique has been widely used to derive vertical profiles of trace gases and aerosols in the troposphere. However, tropospheric O3 has not yet been satisfactorily derived from MAX‐DOAS measurements due to the influence of stratospheric O3 absorption. In this study, we developed two new retrieval approaches for tropospheric O3 from MAX‐DOAS measurements. In method 1, stratospheric O3 profiles from external data sources are considered in the retrieval. In method 2, stratospheric and tropospheric O3 are separated based on the temperature‐dependent differences between tropospheric and stratospheric O3 absorption structures in the UV spectral range. The feasibility of both methods is first verified by applying them to synthetic spectra. Then they are applied to real MAX‐DOAS measurements recorded during the CINDI‐2 campaign in Cabauw, the Netherlands (September 2016). The obtained results are compared with independent O3 measurements and global chemical transport model simulations. Good agreement of the near‐surface O3 concentrations with the independent data sets is found for both methods. However, tropospheric O3 profiles are only reasonably derived using method 1, while they are significantly overestimated at altitudes above 1 km using method 2, probably due to the approximation of the ring spectra used to correct the rotational Raman scattering structures in the DOAS fit. Advantages and disadvantages of both methods are discussed and improvement directions are suggested for further studies.

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“…Due to its relative high temporal and vertical resolution, the lidar technique is able to provide measurements to close the gap between localized high temporal resolution measurements typically provided by in situ instruments and the coarse-resolution measurements provided by satellites. This not only allows the study of boundary layer processes, but also provides valuable information for satellite validation purposes (Newchurch et al, 2016). While this makes lidar a very useful tool for atmospheric and validation studies, their high complexity typically requires the presence of a trained operator, posing a limitation to operation schedules and time coverage.…”

Section: Introductionmentioning

confidence: 99%

Upgrade and automation of the JPL Table Mountain Facility tropospheric ozone lidar (TMTOL) for near-ground ozone profiling and satellite validation

et al. 2019

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Abstract. As part of international efforts to monitor air quality, several satellite missions such as the Tropospheric Monitoring Instrument (TROPOMI) were deployed and others, like Tropospheric Emissions: Monitoring Pollution (TEMPO), are planned for the near future. In support of the validation of these missions, major upgrades to the tropospheric ozone lidar located at the Jet Propulsion Laboratory Table Mountain Facility (TMF) were recently performed. These modifications include the full automation of the system, which now allows unattended measurements during frequent satellite overpasses, and a new receiver that extends the measurement capabilities of the system down to 100 m above surface. The automation led to the systematic operation of the lidar during daily TROPOMI overpasses, providing more than 139 reference profiles since January 2018. Ozone profiles retrieved using the new lidar receiver were compared to ozonesonde profiles obtained from a co-located tethered balloon. An agreement of about 5 % with the ozonesonde down to an altitude range of 100 m a.g.l. was observed. Furthermore, the stability of the receiver configuration was investigated. Comparisons between the lowest point retrieved by the lidar and a co-located surface ozone photometer showed no sign of drift over a 2-month test period and an agreement better than 10 %. Finally, measurements from a 24 h intensive measurement period during a stratospheric intrusion event showed good agreement with two free-flying ozonesondes. These comparisons revealed localized differences between sonde and lidar, possibly owing to the differing vertical resolutions (between 52 and 380 m for lidar and about 100 m for the sonde).

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TOLNET – A Tropospheric Ozone Lidar Profiling Network for Satellite Continuity and Process Studies

Cited by 15 publications

References 8 publications

Three Decades of Tropospheric Ozone Lidar Development at Garmisch-Partenkirchen

Three Decades of Tropospheric Ozone Lidar Development at Garmisch-Partenkirchen

Vertical Profiles of Tropospheric Ozone From MAX‐DOAS Measurements During the CINDI‐2 Campaign: Part 1—Development of a New Retrieval Algorithm

Upgrade and automation of the JPL Table Mountain Facility tropospheric ozone lidar (TMTOL) for near-ground ozone profiling and satellite validation

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