Influence of cloud fraction and snow cover to the variation of surface UV radiation at King Sejong station, Antarctica

Lee, Yun Gon; Koo, Ja Ho; Kim, Jhoon

doi:10.1016/j.atmosres.2015.04.020

Cited by 15 publications

(5 citation statements)

References 54 publications

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“…According to the results of this study, at 320 nm, the change in albedo from 0.1 to 0.9 can lead to up to 26% increase in UV irradiance (in April). The change is greater in high-SZA months, which is in concordance with Lee et al (2015). Cordero et al (2014) state that albedo greater than 90 % can increase UV irradiance by up to 50 %, and Lee at al.…”

Section: Effects Of Explanatory Variables On Spectral Uv Irradiance 265supporting

confidence: 77%

“…5f). Near the Antarctic Peninsula, cloudiness can attenuate more than 90 % of UV irradiance, but in the case of a thin cloud cover and a short optical path through the atmosphere, this number can shrink to as little as 30 % (Lee et al, 2015). However, this amount is likely not the same at all wavelengths, as due to the increased scattering of shorter wavelengths in the atmosphere and thus the decreasing proportion of direct radiation (described e.g., in Schwander et al, 2002), clouds affect solar radiation at longer wavelengths more.…”

Section: Solar Uv Spectra Climatology and Changesmentioning

confidence: 99%

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Assessment of spectral UV radiation at Marambio Base, Antarctic Peninsula

Čížková

Láska²,

Metelka³

et al. 2022

Preprint

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Abstract. This study aims to assess response of spectral UV radiation to different atmospheric and terrestrial factors, including solar zenith angle, ozone, cloud cover and albedo, in southern polar environment. For this purpose, 23260 individual spectra (300–363 nm), obtained by the B199 Mk-III Brewer spectrophotometer at Marambio Base, Antarctic Peninsula Region, over the period 2010–2020, were studied. A neural network model was developed to investigate the effects of the explanatory variables at individual wavelengths. SZA proved to be the most important parameter, followed by cloud cover, TOC, and surface albedo. The relative SZA effect is greatest at the shortest wavelengths, where a 1° decline in SZA results in a 6–18 % increase in UV irradiance (305 nm). Also TOC affects particularly the short wavelengths, while at 305 nm, a 10 DU decrease in TOC causes a 7–13 % increase in UV irradiance. In some seasons (e.g., 2011–2012, 2014–2015, 2018–2019), the large-scale ozone holes caused the UV irradiance at very short wavelengths peak in spring, whereas in other seasons (e.g., 2010–2011, 2012–2013), the maxima at all wavelengths were recorded in summer. The effect of cloud cover was strongest near the fully cloudy sky, and in summer months. Albedo affected the UV irradiance only weakly, its effect was strongest in early spring and late fall.

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Section: Effects Of Explanatory Variables On Spectral Uv Irradiance 265supporting

confidence: 77%

Section: Solar Uv Spectra Climatology and Changesmentioning

confidence: 99%

Assessment of spectral UV radiation at Marambio Base, Antarctic Peninsula

Čížková

Láska²,

Metelka³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Partial cloud cover can also lead to significant radiation amplification. These effects were predicted long ago (Nack and Green, 1974) and have been evidenced by studies focusing on UV radiation, with amplification sometimes exceeding a factor of 2 (McKenzie et al, 1998;Weihs et al, 2000;Lee et al, 2015), but the processes are similar for visible wavelengths and very likely explain these high values. ERA5 values do not seem to account for these processes, and this is one reason why we recommend the use of our SW↓ data over ERA5.…”

Section: Shortwave Upwelling Radiation and Albedomentioning

confidence: 69%

Meteorological, snow and soil data (2013–2019) from a herb tundra permafrost site at Bylot Island, Canadian high Arctic, for driving and testing snow and land surface models

Dominé

Lackner²,

Sarrazin³

et al. 2021

Earth Syst. Sci. Data

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Abstract. Seasonal snow covers Arctic lands 6 to 10 months of the year and is therefore an essential element of the Arctic geosphere and biosphere. Yet, even the most sophisticated snow physics models are not able to simulate fundamental physical properties of Arctic snowpacks such as density, thermal conductivity and specific surface area. The development of improved snow models is in progress, but testing requires detailed driving and validation data for high Arctic herb tundra sites, which are presently not available. We present 6 years of such data for an ice-wedge polygonal site in the Canadian high Arctic, in Qarlikturvik valley on Bylot Island at 73.15∘ N. The site is on herb tundra with no erect vegetation and thick permafrost. Detailed soil properties are provided. Driving data are comprised of air temperature, air relative and specific humidity, wind speed, shortwave and longwave downwelling radiation, atmospheric pressure, and precipitation. Validation data include time series of snow depth, shortwave and longwave upwelling radiation, surface temperature, snow temperature profiles, soil temperature and water content profiles at five depths, snow thermal conductivity at three heights, and soil thermal conductivity at 10 cm depth. Field campaigns in mid-May for 5 of the 6 years of interest provided spatially averaged snow depths and vertical profiles of snow density and specific surface area in the polygon of interest and at other spots in the valley. Data are available at https://doi.org/10.5885/45693CE-02685A5200DD4C38 (Domine et al., 2021). Data files will be updated as more years of data become available.

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“…For example, the UV Ery irradiance in the midlatitudes is similar to that in the tropics during the summer, but it is lowered by approximately 90% during the winter [15,21] due to the large seasonal variation in the solar zenith angle. In addition to the solar position, atmospheric factors such as ozone concentrations [22,23], aerosol [22,23,24], and cloud coverage [25,26] diminish surface UV irradiance. Comprehensively, diminishing surface UV irradiance by the atmospheric conditions caused the "vitamin D winter" effects, which is a season with insufficient vitamin D synthesis by UV irradiance [27,28].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Threshold UV Exposure Time for Vitamin D Synthesis in South Korea

Park

Lee

Kim

et al. 2019

Advances in Meteorology

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The threshold exposure time for synthesis of vitamin D was simulated by using a radiative transfer model considering variations in total ozone, cloud, and surface conditions. The prediction of total ozone took the form of an empirical linear regression with the variables of meteorological parameters in the upper troposphere and lower stratosphere and the climatology value of total ozone. Additionally, to consider cloud extinction after the estimation of clear-sky UV radiation using a radiative transfer model simulation, a cloud modification factor was applied. The UV irradiance was estimated at one-hour intervals, and then, to improve the temporal resolution of the exposure time simulation, it was interpolated to a one-minute resolution. Exposure times from the simulation clearly followed seasonal and diurnal cycles. However, upon comparison with observations, biases with large variations were found, and the discrepancy in the exposure time between the observations and simulations was higher in low UV irradiance conditions. The large deviations in the prediction errors for total ozone and the simplified assumption for the cloud modification factor contributed to the large deviations in exposure time differences between the model estimation and observations. To improve the accuracy of the simulated exposure time, improved predictions of total ozone with a more detailed cloud treatment will be essential.

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Influence of cloud fraction and snow cover to the variation of surface UV radiation at King Sejong station, Antarctica

Cited by 15 publications

References 54 publications

Assessment of spectral UV radiation at Marambio Base, Antarctic Peninsula

Assessment of spectral UV radiation at Marambio Base, Antarctic Peninsula

Meteorological, snow and soil data (2013–2019) from a herb tundra permafrost site at Bylot Island, Canadian high Arctic, for driving and testing snow and land surface models

Simulation of Threshold UV Exposure Time for Vitamin D Synthesis in South Korea

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