Recipe for continuous monitoring of total ozone with a precision of around 1 DU applying mid-infrared solar absorption spectra

M. Schneider (1) , F. Hase (1)

1 IMK-ASF - Institut für Meteorologie und Klimaforschung - Atmosphärische Spurengase und Fernerkundung

Mid-infrared solar absorption spectra recorded by a state-of-the-art ground-based FTIR system have the potential to provide precise total O₃ amounts. The currently best-performing retrieval approaches use a combination of small and broad spectral O₃ windows between 780 and 1015 cm^?1. We show that for these approaches uncertainties in the temperature profile are by far the major error sources. We demonstrate that a joint optimal estimation of temperature and O₃ profiles widely eliminates this error. The improvements are documented by an extensive theoretical error estimation. Our results suggest that mid-infrared FTIR measurements can provide total O₃ amounts with a precision of around 1 DU, placing this method among the most precise ground-based O₃ monitoring techniques. We recapitulate the requirements on instrumental hardware and retrieval necessary to achieve this high precision.

Domaines: Océan, Atmosphère

M. Schneider, F. Hase. Recipe for continuous monitoring of total ozone with a precision of around 1 DU applying mid-infrared solar absorption spectra. Atmospheric Chemistry and Physics Discussions, 2007, 7 (3), pp.9093-9113. ⟨hal-00302908⟩