GUV total ozone column from Stara Zagora, Bulgaria, 2015-2021
Rolf Werner
Responsible institute: Space Research and Technology Institute, Bulgarian Academy of Sciences
Total ozone column (TOC) from GUV-2511 instrument in Stara Zagora (42°26’35.80“N, 25°36’41.50”E), Bulgaria 
Method based on Stamnes et al. (1991), Derivation of total ozone abundance and cloud effects from spectral irradiance measurements, Appl. Opt. Vol. 30, Iss. 30, pp. 4418-4426, doi.org/10.1364/AO.30.004418 and on Dahlback, A. (1996), Measurements of biologically effective UV doses, total ozone abundances, and cloud effects with multichannel, moderate bandwidth filter instruments, Appl. Opt. 35, 6514–6521
1h average   noon-time values, based on data with 1-minute time resolution.
TOC retrievals from 313/340nm channel ratio

Funding: BG161PO003-1.2.04-0053 “Information Complex for Aerospace Monitoring of the Environment“ (ICASME) implemented with the financial support of Operational Programme „Development of the Competitiveness of the Bulgarian Economy 2007-2013”, co-financed by the European Regional Development Fund and the national budget of the Republic of Bulgaria.