Ozone total column retrieval

1. The ozone vertical structure determining from ground-based Fourier spectrometer solar IR radiation measurementsYa.A.Virolainen, Yu.M. Timofeyev, D.V. Ionov, V.S. Kostsov, and A.V. PoberovskySt. Petersburg State University, Russia (mail to: Yana.Virolainen@JV14952.spb.edu) Introduction The ground-based measurements of the direct solar IR radiance by Bruker FTIR spectrometer with high spectral resolution (~0.005 cm-1) has been considered. The spectra measured at St. Petersburg State University (59.88N, 29.82E) in 2009-2012 have been analyzed. The retrieval task has been processed using PROFFIT software. The ozone total column amount as well as the content in thick atmospheric layers has been obtained. The results have been compared to independent ground-based and satellite measurements. Ozone column in thick atmospheric layers Ozone total column retrieval Ozone column retrieved by FTIR-method in thick atmospheric layers is compared to EOS-Aura MLS satellite data (500 km coincidence) – profiles from 9 to 55km. For ozone column comparison the following devices were selected: Satellite - OMI-TOMS, GOME2-DOAS (500 km coincidence) and Ground-based M-124 filter ozonometer (Voeykovo station, 59°57’N, 30°42’E) Comparison of ozone column measurements in two stratospheric layers by FTIR and MLS devices Statistical characteristics of the comparison RMS Difference: Mean Difference: Standard deviation: Conclusions: Minimum of ozone column means and its variations is observed in summer and autumn. Maximum of mean difference between different kinds of measurements is observed in winter - FTIR measurements give higher values of ozone column than other instruments. Standard deviation of different series of measurements is in the range of the accuracy of both instruments (2.9-3.9%). Correlation coefficient totals 0.96-0.98. Ozone column near St. Petersburg in 2009-2012 Temporal variations of stratospheric (SOC) and tropospheric (TOC) ozone column near St. Petersburg Correlations between stratospheric ozone column measurements (FTIR and MLS) for different seasons Correlations between different measurement series Statistical characteristics of FTIR and MLS SOC measurements Conclusions: The coincidence between two types of stratospheric ozone column measurements (Satellite MLS and ground-based FTIR) is better than 10% in the most cases. The standard deviation from mean difference for both instruments totals 5% (for 181 days in 2009-2012). The natural variability of SOC is about 15% for this period. The mean difference between FTIR and MLS measurement series of 3% is observed only in winter time. No mean difference between two instruments is observed in ozone measurements in two stratospheric layers (9-20 and 20-55 km). Standard deviation between two series in middle and high stratosphere totals 6%, natural variability of ozone column is about 10%. In lower stratosphere standard deviation from mean difference of two instruments totals 13%, natural variability – 30%. Acknowledgements: The authors thank Dr. F. Hase from KIT for providing PROFFIT software and Dr. A.M. Shalamyansky from Voeykovo Geophysical Observatory for M-124 ozonometer data. This work has been partly supported by Min. Education and Science grants in the frame of Federal Purposive Program “Scientific and Educational Pool of Innovational Russia” 16.740.11.0048 from 31.08.2010 and grant of Russian Foundation for Basic Research 12-05-00596. References: Poberovsky A.V. Ground-based direct solar IR radiation measurements with a high spectral resolution // Atmospheric and Oceanic Optics. 2010. V. 23, No.01. P. 56-58 Ya. A. Virolainen, Yu. M. Timofeev, D. V. Ionov, A. V. Poberovskii, and A. M. Shalamyanskii Ground-Based Measurements of Total Ozone Content by the Infrared Method // Izvestiya, Atmospheric and Oceanic Physics. 2011. Vol. 47. No. 4. P. 480-490.