1Departament de Física de la Terra i Termodinàmica, University of Valencia, Spain
2Laboratory for Earth Observations and Analyses (UTMEA-TER), ENEA, Rome, Italy
3Agencia Estatal de Meteorología, AEMET, Madrid, Spain
4Artic Research Centre, Finnish Meteorological Institute (FMI-ARC), Sodankylä, Finland
5Estación de Sondeos Atmosféricos "El Arenosillo", INTA, Huelva, Spain
Received: 21 Nov 2011 – Discussion started: 16 Dec 2011
Abstract. A Microtops II "ozone monitor" with UV channels centered at 305.5, 312.5, and 320 nm has been used routinely in six experimental campaigns carried out in several geographic locations and seasons, covering latitudes from 35 to 68° N during the last ten years (2001–2011). The total ozone content is retrieved by Microtops II by using different combinations (Channel I, 305.5/312.5 nm; Channel II, 312.5/320 nm; and Channel III, 305.5/312.5/320 nm) of the signals at the three ultraviolet wavelengths. The long-term performance of the total ozone content determination has been studied taking into account the sensitivities to the calibration, airmass, temperature and aerosols. When a calibration was used and the airmass limit was fixed to 3, the root mean square deviations of the relative differences produced by Microtops II with respect to several Brewers are 0.9, 2, and 2% respectively for the Channel I, Channel II, and Channel III retrieval. The performance of the Microtops retrieval has been stable during the last ten years. Channel I represents the best option to determine the instantaneous total ozone content. Channels II and III values appear weakly sensitive to temperature, ozone content, and aerosols. Channel II is more stable than Channel I for airmasses larger than 2.6. The conclusions do not show any dependence on latitude and season.
Revised: 02 Apr 2012 – Accepted: 09 Apr 2012 – Published: 19 Apr 2012
Gómez-Amo, J. L., Estellés, V., di Sarra, A., Pedrós, R., Utrillas, M. P., Martínez- Lozano, J. A., González-Frias, C., Kyrö, E., and Vilaplana, J. M.: Operational considerations to improve total ozone measurements with a Microtops II ozone monitor, Atmos. Meas. Tech., 5, 759-769, doi:10.5194/amt-5-759-2012, 2012.