LAASURS

Lidar for Automatic Atmospheric Surveys using Raman Scattering

LAASURS is similar to the Water vapour and Aerosol LIdar (WALI), which was operational during HyMeX (http://www.hymex.org/) and ChArMEx (http://www.mistrals-home.org), without a water vapour Raman channel. The LAASURS system itself is well described and validated in Royer et al. (2011) and Chazette et al. (2012). The wide field-of-view (FOV) ~2.3 mrad allows a full overlap of the transmission and reception paths beyond ~ 150‑250 m. Three different channels record the total, the cross-polarized (with respect to the laser emission) elastic backscatter signal of the atmosphere (elastic channels), and the inelastic nitrogen vibrational Raman backscattered signal (N2-Raman channel). The LAASURS instrument can be used in urban/peri-urban areas because its low emitted energy density fulfills eye-safety requirements.

LAASURS in its confinement during a field campaign of the ChArMEx program
LAASURS-derived temporal evolution of the vertical profiles of the aerosol extinction coefficient (AEC) during the heat wave of July 2015 over Paris Area. Time gaps are due to cloudy profiles that were not inverted. The main air mass origins are given.

References

Chazette, P., J. Totems, and X. Shang: Atmospheric aerosol variability above the Paris Area during the 2015 heat wave – Comparison with the 2003 and 2006 heat waves, Atmos. Environ., 170, doi:10.1016/j.atmosenv.2017.09.055, 2017.

Dieudonné, E., Chazette, P., Marnas, F., Totems, J., Shang, X.: Raman Lidar Observations of Aerosol Optical Properties in 11 Cities from France to Siberia. Remote Sens. 9, 978. doi:10.3390/rs9100978, 2017.

Shang, X., Chazette, P., and Totems, J.: Analysis of a warehouse fire smoke plume over Paris with an N2 Raman lidar and an optical thickness matching algorithm, Atmos. Meas. Tech., 11, 6525-6538, https://doi.org/10.5194/amt-11-6525-2018, 2018.

Chazette, P., Totems, J., and Shang, X.: Transport of aerosols over the French Riviera – link between ground-based lidar and spaceborne observations, Atmos. Chem. Phys., 19, 3885-3904, https://doi.org/10.5194/acp-19-3885-2019, 2019.

Baron, A., Chazette, P., and Totems, J.: Remote sensing of two exceptional winter aerosol pollution events and representativeness of ground-based measurements, Atmos. Chem. Phys., 20, 6749–6768, https://doi.org/10.5194/acp-20-6749-2020, 2020.

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