Decreases in the Ozone and the S02 Columns Following the Appearence of the El Chichon Aerosol Cloud at Midlatitude

Bais, A. F.; Zerefos, C. S.; Ziomas, I.; Zoumakis, N. M.; Mantis, Homer T.; Hofmann, D. J.; Fiocco, G.

doi:10.1007/978-94-009-5313-0_72

Cited by 23 publications

(15 citation statements)

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“…The increased SO 2 concentrations are estimated to be of the order of 0.5 to l.Omatmcm, which are also in accordance with the observations of other investigators (23,24,25). On the other hand, Bais et al (26) suggested that the injection of volcanic aerosol into the upper troposphere provides a scavenging mechanism for sulphur dioxide during the first months of 1983. The daily columnar SO 2 measurements in the urban Thessaloniki area ranged from 1.0 to 9.0matm-cm, with mean annual value estimated to be 3.25matm-cm.…”

Section: Instrumentationsupporting

confidence: 74%

A study of the total amount of sulphur dioxide over major Thessaloniki area using solar ultraviolet spectrophotometric measurements

Kelessis

Zoumakis

1993

Environmental Technology

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Solar Ultraviolet spectrophotometric measurements are used to provide estimates of the total columnar sulphur dioxide concentrations over urban, semirural and industrial areas of Thessaloniki in Northern Greece. The systematic observations of the SO 2 column represent an estimate of the impact of anthropogenic sulphur dioxide on the solar radiation received at the surface of the earth. The measurements span over a period of more than ten years, giving the longest presently available record of the total columnar SO 2 in Europe. Total columnar and ground-level SO 2 measurements display an annual variation with maximum concentrations to occur in the winter period of the year. Finally, by combining the simultaneous columnar and surface SO 2 measurements, we obtain estimates of the height of the polluted layer and mean residence time for sulphur dioxide over Thessaloniki basin.

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Section: Instrumentationsupporting

confidence: 74%

A study of the total amount of sulphur dioxide over major Thessaloniki area using solar ultraviolet spectrophotometric measurements

Kelessis

Zoumakis

1993

Environmental Technology

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“…Among these instruments, several Brewer spectrophotometers (Brewer, 1973;Kerr et al, 1985) were deployed at different locations including Thessaloniki, Greece, where the first commercially available singlemonochromator Brewer with serial number 005 (B005) was installed in 1982. Since then B005 has performed continuous measurements of the TOC and the columnar SO 2 (Bais et al, 1993(Bais et al, , 1985Meleti et al, 2012;Zerefos, 1984). These measurements are also used to derive the aerosol optical depth at specific UV-B wavelengths (Kazadzis et al, 2007).…”

Section: Instrumentation and Datamentioning

confidence: 99%

Short- and long-term variability of spectral solar UV irradiance at Thessaloniki, Greece: effects of changes in aerosols, total ozone and clouds

et al. 2016

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Abstract. In this study, we discuss the short-and the longterm variability of spectral UV irradiance at Thessaloniki, Greece, using a long, quality-controlled data set from two Brewer spectrophotometers. Long-term changes in spectral UV irradiance at 307.5, 324 and 350 nm for the period 1994-2014 are presented for different solar zenith angles and discussed in association with changes in total ozone column (TOC), aerosol optical depth (AOD) and cloudiness observed in the same period. Positive changes in annual mean anomalies of UV irradiance, ranging from 2 to 6 % per decade, have been detected both for clear-and all-sky conditions. The changes are generally greater for larger solar zenith angles and for shorter wavelengths. For clear-skies, these changes are, in most cases, statistically significant at the 95 % confidence limit. Decreases in the aerosol load and weakening of the attenuation by clouds lead to increases in UV irradiance in the summer, of 7-9 % per decade for 64 • solar zenith angle. The increasing TOC in winter counteracts the effect of decreasing AOD for this particular season, leading to small, statistically insignificant, negative long-term changes in irradiance at 307.5 nm. Annual mean UV irradiance levels are increasing from 1994 to 2006 and remain relatively stable thereafter, possibly due to the combined changes in the amount and optical properties of aerosols. However, no statistically significant corresponding turning point has been detected in the long-term changes of AOD. The absence of signatures of changes in AOD in the short-term variability of irradiance in the UV-A may have been caused by changes in the single scattering albedo of aerosols, which may counteract the effects of changes in AOD on irradiance. The anticorrelation between the year-to-year variability of the irradiance at 307.5 nm and TOC is clear and becomes clearer as the AOD decreases.

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“…Biennial Oscillation (QBO) from the higher latitude stations in the subtropical group. measurements [2 ]. The inverse relationship between total ozone and stratospheric aerosol is shown in Fig.…”

Section: Results and Conclsuionsmentioning

confidence: 98%

“…In presentations at the 1984 Quadrennial Ozone Symposium a number of references were made to unusually low values of columnar ozone observed in 1983 at various locations in the Northern Hemisphere [2,3,8]. A 5-7% decrease in total ozone in both ground based and satellite observations in late 1982 has also been reported [1 ].…”

Section: Introductionmentioning

confidence: 92%

The Northern Hemisphere ozone minimum in 1982–1983

Mantis

Zerefos

Bais

et al. 1986

Arch. Met. Geoph. Biocl., Ser. B

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Decreases in the Ozone and the S02 Columns Following the Appearence of the El Chichon Aerosol Cloud at Midlatitude

Cited by 23 publications

References 1 publication

A study of the total amount of sulphur dioxide over major Thessaloniki area using solar ultraviolet spectrophotometric measurements

A study of the total amount of sulphur dioxide over major Thessaloniki area using solar ultraviolet spectrophotometric measurements

Short- and long-term variability of spectral solar UV irradiance at Thessaloniki, Greece: effects of changes in aerosols, total ozone and clouds

The Northern Hemisphere ozone minimum in 1982–1983

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