NO2 column amount and total ozone in Stara Zagora (42°N, 25°E) and their response to the solar rotational activity variation

The latitudinal ozone variability study using wavelet analysis

“…3a and b). By the analysis of ground-based measurements at one location (Werner et al, 2006), stronger ozone and the CaII-K index variations are established at the time scale of 27 days, when both quantities are in phase. The scaled averaged spectra are calculated for a multitude of latitudes centered over 57.51S up to 57.51N.…”

Measurements of stratospheric ozone and nitrogen dioxide at Èvora, Portugal

“…This is particularly important in this region, where such measurements had never been performed before. The observation of NO 2 and O 3 can improve our understanding of the complex physical and chemical processes in the (Petritoli et al 1999, Elokhov and Gruzdev 2000, Gruzdev and Elokhov 2005, Werner et al 2006. The sensitivity study of DOAS O 3 retrievals to DD aerosols was assessed and, as a consequence, a correction methodology was applied to the SPATRAM ozone retrievals, whenever DD was present over the area.…”

An Unprecedented Arctic Ozone Depletion Event During Spring 2020 and Its Impacts Across Europe

“…The GUV time series for Ny-Ålesund was provided by Svendby (2021), while the data from UV-RAD at the same station can be accessed at Exaodep-2020Exaodep- (2021. Data of ozone column for the stations Trondheim and Bergen were provided by Johnsen (2022) and data for Stara Zagora by Werner (2022). ERA-5 reanalysis data were used for the study of the ozone behaviour at the three selected stratospheric levels and for construction of the Hovmöller diagrams (ECMWF (2021)).…”

“…As a result, pronounced ozone depletion events in the Arctic have occurred only occasionally and their strengths varied appreciably during winter and spring (Solomon et al, 2007). However, several episodes similar to those observed in the Antarctic have taken place in the past few decades, when unusually stable polar vortices were observed in the springs of 1993, 1996, 1997, 2000(Arnone et al, 2012Hauchecorne et al, 2002;Koch et al, 2004;Manney et al, 1994;Rösevall et al, 2008;WMO, 2007). Of these, the last two episodes together with that in 1997 were found to be extremely strong (Coy et al, 1997;Manney et al, 2011Manney et al, , 2020Lawrence et al, 2020) as illustrated in Figure 8.…”