GUV long-term measurements of total ozone column and  effective cloud transmittance at three Norwegian sites

Svendby, Tove Marit; Johnsen, Bjørn; Kylling, Arve; Dahlback, Arne; Bernhard, Germar; Hansen, Georg; Petkov, Boyan; Vitale, Vito

doi:10.5194/acp-21-7881-2021

Cited by 6 publications

(23 citation statements)

References 41 publications

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“…In late April, ozone turned to the usual values, but it episodically dropped below the 2.5 percentile. These results are consistent with the observations performed by the team of the Norwegian Institute for Air Research (NILU) at Ny-Ålesund with a GUV radiometer and reported by Svendby et al (2021).…”

Section: The 2020 Springtime Ozone Column Over Europe According To Ground-based Measurementssupporting

confidence: 93%

The 2020 Arctic ozone depletion and signs of its effect on the ozone column at lower latitudes

Petkov

Vitale

Carlo

et al. 2021

Bull. of Atmos. Sci.& Technol.

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The present study discusses the effect of the ozone depletion that occurred over the Arctic in 2020 on the ozone column in central and southern Europe by analysing a data set obtained from ground-based measurements at six stations placed from 79 to 42°N. Over the northernmost site (Ny-Ålesund), the ozone column decreased by about 45% compared to the climatological average at the beginning of April, and its values returned to the normal levels at the end of the month. Southwards, the anomaly gradually reduced to nearly 15% at 42°N (Rome) and the ozone minimum was detected with a delay from about 6 days at 65°N to 20 days at 42°N. At the same time, the evolution of the ozone column at the considered stations placed below the polar circle corresponded to that observed at Ny-Ålesund, but at 42°–46°N, the ozone column turned back to the typical values at the end of May. This similarity in the ozone evolutional patterns at different latitudes and the gradually increasing delay of the minimum occurrences towards the south allows the assumption that the ozone columns at lower latitudes were affected by the phenomenon in the Arctic. The ozone decrease observed at Aosta (46°N) combined with predominantly cloud-free conditions resulted in about an 18% increase in the erythemally weighted solar ultraviolet irradiance reaching the Earth’s surface in May.

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Section: The 2020 Springtime Ozone Column Over Europe According To Ground-based Measurementssupporting

confidence: 93%

The 2020 Arctic ozone depletion and signs of its effect on the ozone column at lower latitudes

Petkov

Vitale

Carlo

et al. 2021

Bull. of Atmos. Sci.& Technol.

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“…A detailed description of the method is given in Appendix A. The same method has recently been used to derive total ozone from Ground-based UV radiometers by Svendby et al (2021).…”

Section: Global Irradiance Methodsmentioning

confidence: 99%

“…The ground-based UV (GUV) filter radiometers in Oslo (type GUV-511), Andøya, and Ny-Ålesund (both type GUV-541) measure direct and diffuse solar irradiance at five channels in the UV range from 305 to 380 nm. The measurements are used to derive the UV index, total ozone, biological doses, and cloud transmittance (Svendby et al, 2021). Detailed information about the GUV instruments and the measurement technique can be found in Bernhard (2005) and Svendby et al (2021).…”

Section: Guvmentioning

confidence: 99%

“…The measurements are used to derive the UV index, total ozone, biological doses, and cloud transmittance (Svendby et al, 2021). Detailed information about the GUV instruments and the measurement technique can be found in Bernhard (2005) and Svendby et al (2021). Our GUV data corrections for seasonality and clouds are performed as described by Svendby et al (2021).…”

Section: Guvmentioning

confidence: 99%

“…Detailed information about the GUV instruments and the measurement technique can be found in Bernhard (2005) and Svendby et al (2021). Our GUV data corrections for seasonality and clouds are performed as described by Svendby et al (2021). In addition, we restrict the data from February to October in Andøya and from March to September in Ny-Ålesund, due to limited measurement days in the winter months caused by the low sun or polar night.…”

Section: Guvmentioning

confidence: 99%

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Total ozone trends at three northern high-latitude stations

Bernet,

Svendby,

Hansen

et al. 2022

Preprint

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Abstract. After the decrease of ozone-depleting substances (ODSs) as a consequence of the Montreal Protocol, it is still challenging to detect a recovery in the total column amount of ozone (total ozone) at northern high-latitudes. To assess regional total ozone changes in the "ozone-recovery"-period (2000–2020) at northern high-latitudes, this study investigates trends from ground-based total ozone measurements at three stations in Norway (Oslo, Andøya, and Ny-Ålesund). For this purpose, we combine measurements from Brewer spectrophotometers, ground-based UV filter radiometers (GUVs), and a SAOZ instrument. The Brewer measurements have been extended to work under cloudy conditions using the global irradiance (GI) technique, which is also presented in this study. We derive trends from the combined ground-based time series with the multiple linear regression model from the Long-term Ozone Trends and Uncertainties in the Stratosphere (LOTUS) project. We evaluate various predictors in the regression model and found that tropopause pressure and lower-stratospheric temperature contribute most to ozone variability at the three stations. We report significant positive trends at Andøya (0.9 % per decade) and Ny-Ålesund (1.5 % per decade) and no annual trends at Oslo, but significant positive trends in autumn at all stations. Finally we found positive but insignificant trends of around 3 % per decade in March at all three stations, which may be an indication for Arctic spring-time ozone recovery. Our results contribute to a better understanding of regional total ozone trends at northern high-latitudes, which is essential to assess how Arctic ozone responds to changes in ODSs and to climate change.

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Stratospheric ozone, UV radiation, and climate interactions

Bernhard

Bais

Aucamp³

et al. 2023

Photochem Photobiol Sci

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This assessment provides a comprehensive update of the effects of changes in stratospheric ozone and other factors (aerosols, surface reflectivity, solar activity, and climate) on the intensity of ultraviolet (UV) radiation at the Earth’s surface. The assessment is performed in the context of the Montreal Protocol on Substances that Deplete the Ozone Layer and its Amendments and Adjustments. Changes in UV radiation at low- and mid-latitudes (0–60°) during the last 25 years have generally been small (e.g., typically less than 4% per decade, increasing at some sites and decreasing at others) and were mostly driven by changes in cloud cover and atmospheric aerosol content, caused partly by climate change and partly by measures to control tropospheric pollution. Without the Montreal Protocol, erythemal (sunburning) UV irradiance at northern and southern latitudes of less than 50° would have increased by 10–20% between 1996 and 2020. For southern latitudes exceeding 50°, the UV Index (UVI) would have surged by between 25% (year-round at the southern tip of South America) and more than 100% (South Pole in spring). Variability of erythemal irradiance in Antarctica was very large during the last four years. In spring 2019, erythemal UV radiation was at the minimum of the historical (1991–2018) range at the South Pole, while near record-high values were observed in spring 2020, which were up to 80% above the historical mean. In the Arctic, some of the highest erythemal irradiances on record were measured in March and April 2020. For example in March 2020, the monthly average UVI over a site in the Canadian Arctic was up to 70% higher than the historical (2005–2019) average, often exceeding this mean by three standard deviations. Under the presumption that all countries will adhere to the Montreal Protocol in the future and that atmospheric aerosol concentrations remain constant, erythemal irradiance at mid-latitudes (30–60°) is projected to decrease between 2015 and 2090 by 2–5% in the north and by 4–6% in the south due to recovering ozone. Changes projected for the tropics are ≤ 3%. However, in industrial regions that are currently affected by air pollution, UV radiation will increase as measures to reduce air pollutants will gradually restore UV radiation intensities to those of a cleaner atmosphere. Since most substances controlled by the Montreal Protocol are also greenhouse gases, the phase-out of these substances may have avoided warming by 0.5–1.0 °C over mid-latitude regions of the continents, and by more than 1.0 °C in the Arctic; however, the uncertainty of these calculations is large. We also assess the effects of changes in stratospheric ozone on climate, focusing on the poleward shift of climate zones, and discuss the role of the small Antarctic ozone hole in 2019 on the devastating “Black Summer” fires in Australia. Additional topics include the assessment of advances in measuring and modeling of UV radiation; methods for determining personal UV exposure; the effect of solar radiation management (stratospheric aerosol injections) on UV radiation relevant for plants; and possible revisions to the vitamin D action spectrum, which describes the wavelength dependence of the synthesis of previtamin D3 in human skin upon exposure to UV radiation. Graphical abstract

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GUV long-term measurements of total ozone column and effective cloud transmittance at three Norwegian sites

Cited by 6 publications

References 41 publications

The 2020 Arctic ozone depletion and signs of its effect on the ozone column at lower latitudes

The 2020 Arctic ozone depletion and signs of its effect on the ozone column at lower latitudes

Total ozone trends at three northern high-latitude stations

Stratospheric ozone, UV radiation, and climate interactions

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