Improved ozone DIAL retrievals in the upper troposphere and lower stratosphere using an optimal estimation method

Ghazal Farhani (1) , Robert J. Sica (1) , Sophie Godin-Beekmann (2) , Gérard Ancellet (3) , Alexander Haefele (4)

1 Department of Physics and Astronomy [London, ON]
2 STRATO - LATMOS
3 TROPO - LATMOS
4 Federal Office of Meteorology and Climatology MeteoSwiss

We have implemented a first-principle optimal estimation method to retrieve ozone density profiles using simultaneously tropospheric and stratospheric differential absorption lidar (DIAL) measurements. Our retrieval extends from 2.5 km to about 42 km in altitude, and in the upper troposphere and the lower stratosphere (UTLS) it shows a significant improvement in the overlapping region, where the optimal estimation method (OEM) can retrieve a single ozone profile consistent with the measurements from both lidars. Here stratospheric and tropospheric measurements from the Observatoire de Haute Provence are used, and the OEM retrievals in the UTLS region compared with coincident ozonesonde measurements. The retrieved ozone profiles have a small statistical uncertainty in the UTLS region relative to individual determinations of ozone from each lidar, and the maximum statistical uncertainty does not exceed a maximum of 7%.

Domaines: Physique Atmosphérique et Océanique [physics.ao-ph]; Océan, Atmosphère

Ghazal Farhani, Robert J. Sica, Sophie Godin-Beekmann, Gérard Ancellet, Alexander Haefele. Improved ozone DIAL retrievals in the upper troposphere and lower stratosphere using an optimal estimation method. Applied optics, 2019, 58 (6), pp.1374-1385. ⟨10.1364/AO.58.001374⟩. ⟨insu-02183026⟩