Effects of ozone, cloud and snow on surface UV irradiance

Yun Gon Lee, Jhoon Kim, Bang Yong Lee, Hi Ku Cho

Research output: Contribution to journalArticle

Abstract

Total solar irradiance (TSO), total UV irradiance (TUV) and erythemal UV irradiance (EUV) measured at King Sejong station (62.22°S, 58.78° W) in west Antarctica have been used together with total ozone, cloud amount and snow cover to examine the effects of ozone, cloud and snow surface on these surface solar irradiance over the period of 1998-2003. The data of three solar components for each scan were grouped by cloud amount, n in oktas (0≤ n<3, 3≤n<4, 4≤n<5, 5≤n<6, 6≤n<7 and 7≤n<8) and plotted against solar zenith angle (SZA over the range of 45° to 75°. The radiation amplification factor (RAF) is used to quantify ozone effect on EUV. RAF of EUV decreases from 1.51 to 0.94 under clear skies but increases from 0.94 to 1.85 under cloudy skies as SZA increases, and decreases from 1.51 to 1.01 as cloud amount increases. The effects of cloud amount and snow surface on EUV are estimated as a function of SZA and cloud amount after normalization of the data to the reference total ozone of 300 DU. In order to analyse the transmission of solar radiation by cloud, regression analyses have been performed for the maximum values of solar irradiance on clear sky conditions (0≤n<3) and the mean values on cloudy conditions, respectively. The maximum regression values for the clear sky cases were taken to represent minimum aerosol conditions for the site and thus appropriate for use as a normalization (reference) factor for the other regressions. The overall features for the transmission of the three solar components show a relatively high values around SZAs of 55° and 60° under all sky conditions and cloud amounts 4≤n<5 and 5≤n<6. The transmission is, in general, the largest in TUV and the smallest in EUV among the three components of the solar irradiance. If the ground is covered with snow on partly cloudy days (6≤n<7), EUV increases by 20 to 26% compared to snow-free surface around SZA 60° -65°, due to multiple reflections and scattering between the surface and the clouds. The relative difference between snow surface and snow-free surface slowly increases from 9% to 20% as total ozone increases from 100 DU to 400 DU under partly cloud conditions (3≤n< 6) at SZA 60°. The snow effects on TUV and TSO are relatively high with 32% and 34%, respectively, under clear sky conditions, while the effects changes to 36% and 20% for TUV and TSO, respectively, as cloud amount increases.

Original languageEnglish
Pages (from-to)439-451
Number of pages13
JournalOcean and Polar Research
Volume26
Issue number3
DOIs
Publication statusPublished - 2004 Jan 1

Fingerprint

Ozone
Snow
ozone
snow
irradiance
solar radiation
clear sky
Amplification
total ozone
Radiation
snowpack
aerosols
effect
Antarctica
Solar radiation
Aerosols
amplification
Scattering
zenith angle
snow cover

All Science Journal Classification (ASJC) codes

  • Aquatic Science
  • Ocean Engineering
  • Geology
  • Fluid Flow and Transfer Processes

Cite this

Lee, Yun Gon ; Kim, Jhoon ; Lee, Bang Yong ; Cho, Hi Ku. / Effects of ozone, cloud and snow on surface UV irradiance. In: Ocean and Polar Research. 2004 ; Vol. 26, No. 3. pp. 439-451.
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abstract = "Total solar irradiance (TSO), total UV irradiance (TUV) and erythemal UV irradiance (EUV) measured at King Sejong station (62.22°S, 58.78° W) in west Antarctica have been used together with total ozone, cloud amount and snow cover to examine the effects of ozone, cloud and snow surface on these surface solar irradiance over the period of 1998-2003. The data of three solar components for each scan were grouped by cloud amount, n in oktas (0≤ n<3, 3≤n<4, 4≤n<5, 5≤n<6, 6≤n<7 and 7≤n<8) and plotted against solar zenith angle (SZA over the range of 45° to 75°. The radiation amplification factor (RAF) is used to quantify ozone effect on EUV. RAF of EUV decreases from 1.51 to 0.94 under clear skies but increases from 0.94 to 1.85 under cloudy skies as SZA increases, and decreases from 1.51 to 1.01 as cloud amount increases. The effects of cloud amount and snow surface on EUV are estimated as a function of SZA and cloud amount after normalization of the data to the reference total ozone of 300 DU. In order to analyse the transmission of solar radiation by cloud, regression analyses have been performed for the maximum values of solar irradiance on clear sky conditions (0≤n<3) and the mean values on cloudy conditions, respectively. The maximum regression values for the clear sky cases were taken to represent minimum aerosol conditions for the site and thus appropriate for use as a normalization (reference) factor for the other regressions. The overall features for the transmission of the three solar components show a relatively high values around SZAs of 55° and 60° under all sky conditions and cloud amounts 4≤n<5 and 5≤n<6. The transmission is, in general, the largest in TUV and the smallest in EUV among the three components of the solar irradiance. If the ground is covered with snow on partly cloudy days (6≤n<7), EUV increases by 20 to 26{\%} compared to snow-free surface around SZA 60° -65°, due to multiple reflections and scattering between the surface and the clouds. The relative difference between snow surface and snow-free surface slowly increases from 9{\%} to 20{\%} as total ozone increases from 100 DU to 400 DU under partly cloud conditions (3≤n< 6) at SZA 60°. The snow effects on TUV and TSO are relatively high with 32{\%} and 34{\%}, respectively, under clear sky conditions, while the effects changes to 36{\%} and 20{\%} for TUV and TSO, respectively, as cloud amount increases.",
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Effects of ozone, cloud and snow on surface UV irradiance. / Lee, Yun Gon; Kim, Jhoon; Lee, Bang Yong; Cho, Hi Ku.

In: Ocean and Polar Research, Vol. 26, No. 3, 01.01.2004, p. 439-451.

Research output: Contribution to journalArticle

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T1 - Effects of ozone, cloud and snow on surface UV irradiance

AU - Lee, Yun Gon

AU - Kim, Jhoon

AU - Lee, Bang Yong

AU - Cho, Hi Ku

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