Global solar UV index

1995 ◽  
Vol 5 ◽  
pp. 47-48
Author(s):  
J. P. Césarini
Keyword(s):  
Uv Index ◽  
Solar Uv

Climatological Global Solar UV Index: Measurement and Health Issues in Malta

2020 ◽  
pp. 253-277
Author(s):  
Roderick Busuttil ◽  
Charles Galdies ◽  
Joseph Cacciottolo ◽  
Charles Yousif
Keyword(s):  
Health Issues ◽  
Uv Index ◽  
Index Measurement ◽  
Solar Uv

scholarly journals Quality assessment of solar UV irradiance measured with array spectroradiometers

2016 ◽  
Vol 9 (4) ◽  
pp. 1553-1567 ◽  
Author(s):  
Luca Egli ◽  
Julian Gröbner ◽  
Gregor Hülsen ◽  
Luciano Bachmann ◽  
Mario Blumthaler ◽  
...  
Keyword(s):  
Spectral Irradiance ◽  
Stray Light ◽  
Atmospheric Conditions ◽  
End User ◽  
Uv Index ◽  
Uv Irradiance ◽  
The World ◽  
Solar Uv ◽  
Solar Uv Irradiance

Abstract. The reliable quantification of ultraviolet (UV) radiation at the earth's surface requires accurate measurements of spectral global solar UV irradiance in order to determine the UV exposure to human skin and to understand long-term trends in this parameter. Array spectroradiometers (ASRMs) are small, light, robust and cost-effective instruments, and are increasingly used for spectral irradiance measurements. Within the European EMRP ENV03 project “Solar UV”, new devices, guidelines and characterization methods have been developed to improve solar UV measurements with ASRMs, and support to the end user community has been provided. In order to assess the quality of 14 end user ASRMs, a solar UV intercomparison was held on the measurement platform of the World Radiation Center (PMOD/WRC) in Davos, Switzerland, from 10 to 17 July 2014. The results of the blind intercomparison revealed that ASRMs, currently used for solar UV measurements, show a large variation in the quality of their solar UV measurements. Most of the instruments overestimate the erythema-weighted UV index – in particular at large solar zenith angles – due to stray light contribution in the UV-B range. The spectral analysis of global solar UV irradiance further supported the finding that the uncertainties in the UV-B range are very large due to stray light contribution in this wavelength range. In summary, the UV index may be detected by some commercially available ASRMs within 5 % compared to the world reference spectroradiometer, if well characterized and calibrated, but only for a limited range of solar zenith angles. Generally, the tested instruments are not yet suitable for solar UV measurements for the entire range between 290 and 400 nm under all atmospheric conditions.

scholarly journals First national intercomparison of solar ultraviolet radiometers in Italy

2011 ◽  
Vol 4 (3) ◽  
pp. 2789-2826 ◽  
Author(s):  
H. Diémoz ◽  
A. M. Siani ◽  
G. R. Casale ◽  
A. di Sarra ◽  
B. Serpillo ◽  
...  
Keyword(s):  
Environmental Protection Agency ◽  
Calibration Data ◽  
Uv Index ◽  
Uv Irradiance ◽  
Solar Uv ◽  
Solar Uv Irradiance ◽  
Field Intercomparison ◽  
Synchronized Measurements ◽  
First Time ◽  
Double Monochromator

Abstract. A blind intercomparison of ground-based ultraviolet (UV) instruments has been organized for the first time in Italy. The campaign was coordinated by the Environmental Protection Agency of Aosta Valley (ARPA Valle d'Aosta) and took place in Saint-Christophe (45.8° N, 7.4° E, 570 m a.s.l.), in the Alpine region, from 8 to 23 June 2010. It involved 8 institutions, 10 broadband radiometers, 2 filter radiometers and 2 spectroradiometers. Synchronized measurements of downward global solar UV irradiance at the ground were collected and the raw series were then individually processed by the respective operators on the basis of their own procedures and calibration data. The comparison was performed in terms of global solar UV Index and integrated UV-A irradiance against a well-calibrated double monochromator spectroradiometer as reference. An improved algorithm for comparing broadband data and spectra has been developed. For some instruments, we found average deviations ranging from −16 % up to 20 % relative to the reference and diurnal variations as large as 15 % even in clear days. Remarkable deviations also arose from instruments recently in operation and never involved in field intercomparison.

Global Solar UV Index: Australian Measurements, Forecasts and Comparison with the UK¶

2004 ◽  
Vol 79 (1) ◽  
pp. 32-39 ◽  
Author(s):  
Peter Gies ◽  
Colin Roy ◽  
John Javorniczky ◽  
Stuart Henderson ◽  
Lilia Lemus-Deschamps ◽  
...  
Keyword(s):  
Uv Index ◽  
Solar Uv ◽  
The Uk

Global Solar UV Index

2000 ◽  
Vol 91 (1) ◽  
pp. 307-311 ◽  
Author(s):  
M.H. Repacholi
Keyword(s):  
Uv Index ◽  
Solar Uv

scholarly journals Satellite Estimation and Ground Based Measurements of Solar UV Index in Kathmandu

2014 ◽  
Vol 9 (1) ◽  
pp. 18-26
Author(s):  
Niranjan Prasad Sharma
Keyword(s):  
Solar Radiation ◽  
Spectral Range ◽  
Ozone Monitoring Instrument ◽  
Monsoon Period ◽  
Uv Index ◽  
Uv Irradiance ◽  
Before And After ◽  
Solar Uv ◽  
Ozone Monitoring ◽  
Ozone Column

The study is based on the satellite estimation and ground measurements of solar UV index in Kathmandu for the year 2009. Kathmandu (27.720N, 85.320E) is located at an elevation of 1350m from the sea level. The ground based measurement and satellite estimation was performed by NILU-UV irradiance meter and EOS Aura OMI spacecraft. The NILU-UV irradiance meter measures UV radiation in different spectral range. The Ozone Monitoring Instrument (OMI) is a spectrometer designed to monitor solar radiation in spectral range of (270-500) nm. This study shows that satellite overestimates the ground based (GB) UV Index (UVI) before monsoon by 103.6 % whereas during the monsoon period overestimation comes down to 70.8 %. The correlation coefficient (r) between ozone column from satellite and ground based measurement before monsoon and after monsoon is also studied. It is observed that the correlation between satellite estimated ozone column and ground based ozone column before and after monsoon is 0.83. The study showed that the estimation of OMI before monsoon is high than after monsoon. DOI: http://dx.doi.org/10.3126/jie.v9i1.10664Journal of the Institute of Engineering, Vol. 9, No. 1, pp. 18–26

scholarly journals UV Index for Public Health Awareness Based on OMI/NASA Satellite Data at King Abdulaziz University, Saudi Arabia

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Abdullah Addas ◽  
Mahmoud Ragab ◽  
Ahmad Maghrabi ◽  
S. M. Abo-Dahab ◽  
Eman F. El-Nobi
Keyword(s):  
Public Health ◽  
Saudi Arabia ◽  
Uv Radiation ◽  
Environmental Protection Agency ◽  
The United States ◽  
World Health ◽  
Uv Index ◽  
Solar Uv Radiation ◽  
King Abdulaziz University ◽  
Solar Uv

Exposure to ultraviolet radiation (UV) is essential for good health and formation of vitamin D while overexposure poses a risk to public health. Therefore, it is important to provide information to the public about the level of solar UV radiation. The ultraviolet index (UVI) is used to help avoid the negative effects of ultraviolet (UV) radiation on humans and to optimize individual exposure. There is limited ground measurement of solar UV radiation, but satellite Ozone Monitoring Instrument (OMIs) satellite products with a spatial resolution of 1 ° × 1 ° can be used to create UV index climatology at local noon time. In this study, we utilize OMI satellite products collected over the campus of King Abdulaziz University (KAU) (21.5° North and 39.1° East), Jeddah, Saudi Arabia, to estimate changes in exposure to UV over a period of 15 years (2004-2020). The results indicate a significantly increasing trend in UV index over this period. Between 2004 and 2020, daily “extreme” UV ( UVI > 11 , as defined by the World Health Organization (WHO)) occurred on 46.60% of days. The frequency of low UVI ( UVI < 2 ) was only about 0.06%. These results imply dangerous exposure levels to solar UV radiation on the KAU campus and call for safety measures to increase awareness and decrease direct exposure; for example, by implementing the United States Environmental Protection Agency (EPA) general guidelines.

scholarly journals Solar UV Index at Different Altitudes of Nepal

2018 ◽  
Vol 14 (1) ◽  
pp. 200-205
Author(s):  
Niranjan Prasad Sharma
Keyword(s):  
Flat Surface ◽  
Scattered Light ◽  
Visible Spectrum ◽  
Ozone Monitoring Instrument ◽  
Uv Index ◽  
Uv Irradiance ◽  
Solar Uv ◽  
Ozone Monitoring ◽  
Solar Ultraviolet ◽  
Ultraviolet Index

The main objective of this research is to study the satellite estimated solar Ultraviolet data alongside the ground based data in Nepal. Kathmandu (27.72°N, 85.32°>E), Pokhara (28.22°N, 83.32°E) Biratnagar (26.45°N, 87.27°E) and Lukla (27.69°N, 86.73°E) are located at an elevation of 1350m, 800m, 72m and 2850m respectively from the sea level. The ground based measurements and the satellite estimation were performed by NILU-UV irradiance meter and EOS Aura OMI satellite respectively. The NILU-UV irradiance meter is a six channel radiometer designed to measure hemispherical irradiances on a flat surface. Meanwhile the Ozone Monitoring Instrument (OMI) on board, the NASA EOS Aura space craft is a nadir viewing spectrometer that measures solar reflected and back scattered light in ultraviolet and visible spectrum. The study was performed for 3 years Ultraviolet Radiation (UVR) data. This study showed that the ratio of predicted OMI Ultraviolet Index (UVI) to that determined from the ground based measurement was less than 1.21 except in Lukla.Journal of the Institute of Engineering, 2018, 14(1): 200-205

scholarly journals Comparison of Ground Based Measurements of Solar UV Index with Satellite Estimation at Four Sites of Nepal

1970 ◽  
Vol 8 (3) ◽  
pp. 58-71 ◽  
Author(s):  
Niranjan P Sharma ◽  
Binod K Bhattarai ◽  
Balkrishna Sapkota ◽  
Berit Kjeldstad
Keyword(s):  
Flat Surface ◽  
Scattered Light ◽  
Single Point ◽  
Visible Spectrum ◽  
Ozone Monitoring Instrument ◽  
Monsoon Period ◽  
Uv Index ◽  
Ground Measurement ◽  
Solar Uv ◽  
Ozone Column

The main objective of this study is to compare the ground based measurements and satellite estimation of solar UV index in four sites namely, Kathmandu, Pokhara, Biratnagar and Lukla. Kathmandu (27.72°N, 85.32°E), Pokhara (28.22°N, 83.32°E) Biratnagar (26.45°N, 87.27° E) and Lukla ( 27.69°N, 86.73°E) and are located at an elevation of 1350m, 800m, 72m and 2850m respectively from the sea level. The ground based measurements and satellite estimation were performed by NILUUV irradiance meter and EOS Aura OMI satellite. The NILUUV irradiance meter is a six channel radiometer designed to measure hemispherical irradiances on a flat surface. The Ozone Monitoring Instrument (OMI) on board, the NASA EOS Aura space craft is a nadir viewing spectrometer that measures solar reflected and back scattered light in ultraviolet and visible spectrum. The study shows that OMI overestimate the ground based data before monsoon by 71.28%, 47.29%, 27.92% and 35.83% respectively at Kathmandu, Pokhara, Biratnagar and Lukla. However during the monsoon period the same comes down to 8.55%, 15.63%, 10.74%, and 11.33% respectively. The main reason behind these discrepancies might be due to the spatial resolution of the satellite which estimates the UV Index on the basis of 13×24 km2 in nadir where as the ground measurement is for a single point. The correlation between satellite derived and ground measured ozone column was found to be 91 % and 89% for Kathmandu and Lukla respectively. DOI: http://dx.doi.org/10.3126/jie.v8i3.5932 JIE 2011; 8(3): 58-71

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