scholarly journals Relation between Global Solar Radiation and Solar Ultraviolet Radiation in Different Parts of Nepal

1970 ◽  
Vol 8 (3) ◽  
pp. 169-175
Author(s):  
Rudra P Pokhrel ◽  
Binod K Bhattarai
Keyword(s):  
Solar Radiation ◽  
Ultraviolet Radiation ◽  
Uv Radiation ◽  
Public Awareness ◽  
Global Radiation ◽  
Global Solar Radiation ◽  
Regression Equations ◽  
Solar Ultraviolet Radiation ◽  
Radiation Level ◽  
Solar Ultraviolet

Part of the solar spectrum whose wavelength lies between 40 to 400 nm is called Solar Ultraviolet radiation. Solar UV Index (UVI) is the measure of the UV radiation level at a place, which plays the important role to raise public awareness and alert people to use protective measures when exposed to UV radiation. This study tries to find out the UV radiation level at a place by knowing the global radiation and will help to find out the UV radiation level at different places where UV radiation measuring instruments are not easily accessible. By the study of the relationship between global solar radiation and Solar Ultraviolet radiation at different sites (Biratnagar, Lukla, Kathmandu and Pokhara) of Nepal, simple regression equations were obtained. UV radiation level at a place was retrieved by using this equation. Ground based global solar radiation were measured by using radiation measuring instrument, Pyranometer (CMP6), manufactured by Kipp and Zonen, Netherland. A comparison between equation based calculation and ground based measurement of UV level (using NLU-UV meter) shows the average deviation of 3% at Lukla, 7% at Kathmandu and Pokhara and 6% Biratnagar in the year 2009 and 2010. It is also noted that Lukla is clearer among the four stations. This deviation might be due to effect of aerosols, humidity and non-ideal cosine response of the instrument. DOI: http://dx.doi.org/10.3126/jie.v8i3.5942 JIE 2011; 8(3): 169-175

scholarly journals Episode of unusual high solar ultraviolet radiation in central Europe due to dynamical reduced stratospheric ozone in May 2005

2005 ◽  
Vol 5 (5) ◽  
pp. 10409-10420 ◽  
Author(s):  
C. Stick ◽  
K. Krüger ◽  
N. H. Schade ◽  
H. Sandmann ◽  
A. Macke
Keyword(s):  
Ultraviolet Radiation ◽  
Uv Radiation ◽  
Stratospheric Ozone ◽  
Solar Ultraviolet Radiation ◽  
Solar Uv ◽  
Resultant Increase ◽  
The Tropics ◽  
Effective Radiation ◽  
Ozone Episodes ◽  
Solar Ultraviolet

Abstract. In late May this year unusual high levels of solar ultraviolet radiation were observed in Europe. In Northern Germany the measured irradiance of erythemally effective radiation exceeded the climatological mean by more than about 20%. An extreme low ozone event for the season coincided with the high solar elevation angles during late spring leading to the highest value of erythemal UV-radiation ever observed at this location in May. This ''ozone mini-hole'' was caused by an elevation of tropopause height accompanied with a poleward advection of natural low total ozone from the tropics. The resultant increase in UV-radiation is of particular significance for human health. Dynamically induced low ozone episodes that happen around the summer solstice can considerably enhance the solar UV-radiation in the mid latitudes and therefore contribute to the UV-burden of people living in the mid latitudes.

scholarly journals Spring and summer time ozone and solar ultraviolet radiation variations over Cape Point, South Africa

2019 ◽  
Vol 37 (2) ◽  
pp. 129-141 ◽  
Author(s):  
David J. du Preez ◽  
Jelena V. Ajtić ◽  
Hassan Bencherif ◽  
Nelson Bègue ◽  
Jean-Maurice Cadet ◽  
...  
Keyword(s):  
South Africa ◽  
Ultraviolet Radiation ◽  
Uv Radiation ◽  
Stratospheric Ozone ◽  
Solar Ultraviolet Radiation ◽  
Clear Sky ◽  
Solar Uv Radiation ◽  
Solar Uv ◽  
Solar Ultraviolet ◽  
Ozone Levels

Abstract. The correlation between solar ultraviolet radiation (UV) and atmospheric ozone is well understood. Decreased stratospheric ozone levels which led to increased solar UV radiation levels at the surface have been recorded. These increased levels of solar UV radiation have potential negative impacts on public health. This study was done to determine whether the break-up of the Antarctic ozone hole has an impact on stratospheric columnar ozone (SCO) and resulting ambient solar UV-B radiation levels at Cape Point, South Africa, over 2007–2016. We investigated the correlations between UV index, calculated from ground-based solar UV-B radiation measurements and satellite-retrieved column ozone data. The strongest anti-correlation on clear-sky days was found at solar zenith angle 25∘ with exponential fit R2 values of 0.45 and 0.53 for total ozone column and SCO, respectively. An average radiation amplification factor of 0.59 across all SZAs was calculated for clear-sky days. The MIMOSA-CHIM model showed that the polar vortex had a limited effect on ozone levels. Tropical air masses more frequently affect the study site, and this requires further investigation.

scholarly journals Spring and summer time ozone and solar ultraviolet radiation variations over Cape Point, South Africa

2018 ◽  
Author(s):  
D. Jean du Preez ◽  
Jelena V. Ajtić ◽  
Hassan Bencherif ◽  
Nelson Bègue ◽  
Caradee Y. Wright
Keyword(s):  
South Africa ◽  
Ultraviolet Radiation ◽  
Uv Radiation ◽  
Stratospheric Ozone ◽  
Polar Vortex ◽  
Solar Ultraviolet Radiation ◽  
Solar Uv Radiation ◽  
Solar Uv ◽  
Solar Ultraviolet ◽  
Ozone Levels

Abstract. The correlation between solar ultraviolet radiation (UV) and atmospheric ozone is well understood. Decreased stratospheric ozone levels which led to increased solar UV radiation levels at the surface have been recorded. These increased levels of solar UV radiation have potential negative impacts on public health. This study was done to determine whether or not the break-up of the Antarctic ozone hole has an impact on stratospheric columnar ozone (SCO) concentrations and resulting ambient solar UV-B radiation levels at Cape Point, South Africa. At Cape Point, the strongest anti-correlation on clear-sky days was found at solar zenith angle 20° with exponential fit R2 values of 0.71 and 0.66 for total ozone column and SCO, respectively. An average radiation amplification factor of 0.92 was found and the largest decrease in ozone levels occurred during September months. The MIMIOSA-CHIM model showed that the polar vortex had a limited effect on ozone levels at 435–440 K for September and 600 K over Cape Point during November. Tropical air-masses more frequently affect the study site, and this requires further investigation.

scholarly journals Episode of unusual high solar ultraviolet radiation over central Europe due to dynamical reduced total ozone in May 2005

2006 ◽  
Vol 6 (7) ◽  
pp. 1771-1776 ◽  
Author(s):  
C. Stick ◽  
K. Krüger ◽  
N. H. Schade ◽  
H. Sandmann ◽  
A. Macke
Keyword(s):  
Ultraviolet Radiation ◽  
Central Europe ◽  
Uv Radiation ◽  
Solar Ultraviolet Radiation ◽  
Solar Uv ◽  
The Tropics ◽  
Sky Conditions ◽  
Effective Radiation ◽  
Ozone Episodes ◽  
Solar Ultraviolet

Abstract. In late May 2005 unusual high levels of solar ultraviolet radiation were observed over central Europe. In Northern Germany the measured irradiance of erythemally effective radiation exceeded the climatological mean by more than about 20%. An extreme low ozone event for the season coincided with high solar elevation angles and high pressure induced clear sky conditions leading to the highest value of erythemal UV-radiation ever observed over this location in May since 1994. This hereafter called "ozone mini-hole" was caused by an elevation of tropopause height accompanied with a poleward advection of ozone-poor air from the tropics. The resultant increase in UV-radiation is of particular significance for human health. Dynamically induced low ozone episodes that happen in late spring can considerably enhance the solar UV-radiation in mid latitudes and therefore contribute to the UV-burden of people living in these regions.

Simplified Calibration for Broadband Solar Ultraviolet Radiation Measurements¶

2003 ◽  
Vol 78 (6) ◽  
pp. 603 ◽  
Author(s):  
A. Oppenrieder ◽  
P. Hoeppe ◽  
P. Koepke ◽  
J. Reuder ◽  
J. Schween ◽  
...  
Keyword(s):  
Ultraviolet Radiation ◽  
Solar Ultraviolet Radiation ◽  
Solar Ultraviolet ◽  
Radiation Measurements
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