Lidar/Laser Sounders
type: Concept

GSFC TROPOZ DIAL
type: Concept
change note: 2020-11-12 16:33:16.0 [sritz] insert AltLabel (id: null category: primary text: NASA Goddard Space Flight Center TRO-Pospheric Ozone Differential Absorption Lidar language code: en); insert Definition (id: null text: Tropospheric ozone profiles have been retrieved from the new ground-based National Aeronautics and Space Administration (NASA) Goddard Space Flight Center TRO-Pospheric OZone DIfferential Absorption Lidar (GSFC TROPOZ DIAL) in Greenbelt, MD (38.99 • N, 76.84 • W, 57 m a.s.l.), from 400 m to 12 km a.g.l. Current atmospheric satellite instruments cannot peer through the optically thick stratospheric ozone layer to remotely sense boundary layer tropospheric ozone. In order to monitor this lower ozone more effectively, the Tropospheric Ozone Lidar Network (TOLNet) has been developed, which currently consists of five stations across the US. The GSFC TROPOZ DIAL is based on the DIAL technique, which currently detects two wavelengths, 289 and 299 nm, with multiple receivers. The transmitted wavelengths are generated by focusing the out-put of a quadrupled Nd:YAG laser beam (266 nm) into a pair of Raman cells, filled with high-pressure hydrogen and deu-terium, using helium as buffer gas. With the knowledge of the ozone absorption coefficient at these two wavelengths, the range-resolved number density can be derived. An in-teresting atmospheric case study involving the stratospheric– tropospheric exchange (STE) of ozone is shown, to empha-size the regional importance of this instrument as well as to assess the validation and calibration of data. There was a low amount of aerosol aloft, and an iterative aerosol correc-tion has been performed on the retrieved data, which resulted in less than a 3 ppb correction to the final ozone concentra-tion. The retrieval yields an uncertainty of 16–19 % from 0 to 1.5 km, 10–18 % from 1.5 to 3 km, and 11–25 % from 3 to 12 km according to the relevant aerosol concentration aloft. There are currently surface ozone measurements h…
change note: 2020-11-12 16:30:30.0 [sritz] Insert Concept add broader relation (GSFC TROPOZ DIAL [4a22e9df-49e0-4189-ba5d-26cf2320e89a,560773] - Lidar/Laser Sounders [7c13f166-8711-4d2f-9251-4635002c6c31,544685]);
in scheme: instruments
definition: Tropospheric ozone profiles have been retrieved from the new ground-based National Aeronautics and Space Administration (NASA) Goddard Space Flight Center TRO-Pospheric OZone DIfferential Absorption Lidar (GSFC TROPOZ DIAL) in Greenbelt, MD (38.99 • N, 76.84 • W, 57 m a.s.l.), from 400 m to 12 km a.g.l. Current atmospheric satellite instruments cannot peer through the optically thick stratospheric ozone layer to remotely sense boundary layer tropospheric ozone. In order to monitor this lower ozone more effectively, the Tropospheric Ozone Lidar Network (TOLNet) has been developed, which currently consists of five stations across the US. The GSFC TROPOZ DIAL is based on the DIAL technique, which currently detects two wavelengths, 289 and 299 nm, with multiple receivers. The transmitted wavelengths are generated by focusing the out-put of a quadrupled Nd:YAG laser beam (266 nm) into a pair of Raman cells, filled with high-pressure hydrogen and deu-terium, using helium as buffer gas. With the knowledge of the ozone absorption coefficient at these two wavelengths, the range-resolved number density can be derived. An in-teresting atmospheric case study involving the stratospheric– tropospheric exchange (STE) of ozone is shown, to empha-size the regional importance of this instrument as well as to assess the validation and calibration of data. There was a low amount of aerosol aloft, and an iterative aerosol correc-tion has been performed on the retrieved data, which resulted in less than a 3 ppb correction to the final ozone concentra-tion. The retrieval yields an uncertainty of 16–19 % from 0 to 1.5 km, 10–18 % from 1.5 to 3 km, and 11–25 % from 3 to 12 km according to the relevant aerosol concentration aloft. There are currently surface ozone measurements hourly and ozonesonde launches occasionally, but this system will be the first to make routine tropospheric ozone profile measure-ments in the Baltimore–Washington, D.C. area.