scholarly journals Validation of satellite-based noontime UVI with NDACC ground-based instruments: influence of topography, environment and overpass time

2016 ◽  
Author(s):  
Colette Brogniez ◽  
Frédérique Auriol ◽  
Christine Deroo ◽  
Antti Arola ◽  
Jukka Kujanpää ◽  
...  
Keyword(s):  
Uv Radiation ◽  
Atmospheric Composition ◽  
Urban Site ◽  
Uv Index ◽  
Solar Uv Radiation ◽  
The North ◽  
Solar Noon ◽  
Solar Uv ◽  
New Processing ◽  
Satellite Instruments

Abstract. Spectral solar UV radiation measurements are performed in France using three spectroradiometers located in very different sites. One is installed in Villeneuve d’Ascq, in the north of France (VDA). It is an urban site in a topographically flat region. Another instrument is installed in Observatoire de Haute Provence, in the French Southern Alps (OHP). It is a rural mountainous site. The third instrument is installed in Saint-Denis, Reunion Island (SDR). It is a coastal urban site on a small mountainous Island in the Southern tropics. The three instruments are affiliated to the Network for the Detection of Atmospheric Composition Change (NDACC) and carry out routine measurements to monitor the spectral solar UV radiation and enable derivation of UV index (UVI). The ground-based UVI values observed at solar noon are compared to similar quantities derived from OMI/Aura and GOME-2/Metop-A satellite measurements for validation of these satellite-based products. The present study concerns the period 2009–September 2012, date of the change of OMI data processing. UVI products from the old (v1.2) and new (v1.3) versions of OMI are used to assess the improvement of the new processing. On average, estimates from satellite instruments always overestimate surface UVI at solar noon. Under cloudless conditions the satellite-derived estimates of UVI compare satisfactorily with ground-based data: the median relative bias is less than 8 % at VDA and 4 % at SDR for both OMI-v1.3 and GOME-2, and about 6 % for OMI-v1.3 and 2% for GOME-2 at OHP. Correlation between satellite-based and ground-based data is better at VDA and OHP (about 0.99) than at SDR (0.96) for both spatial instruments. For all sky conditions the median relative biases are much larger, with large dispersion for both instruments at all sites (VDA: about 12 %; OHP: 9 %; SDR: 11 %). Correlation between satellite-based and ground-based data is still better at VDA and OHP (about 0.95) than at SDR (about 0.73) for both satellite instruments. These results are explained considering the time of overpass of the two satellites, which is far from solar noon, preventing a good estimation of the cloud cover necessary to a good modelling of the UVI. Site topography and environment are shown to have a non-significant influence. At VDA and OHP, OMI-v1.3 shows a significant improvement with respect to v1.2 that did not account for absorbing aerosols.

scholarly journals Validation of satellite-based noontime UVI with NDACC ground-based instruments: influence of topography, environment and satellite overpass time

2016 ◽  
Vol 16 (23) ◽  
pp. 15049-15074 ◽  
Author(s):  
Colette Brogniez ◽  
Frédérique Auriol ◽  
Christine Deroo ◽  
Antti Arola ◽  
Jukka Kujanpää ◽  
...  
Keyword(s):  
Uv Radiation ◽  
Atmospheric Composition ◽  
Urban Site ◽  
Ozone Monitoring Instrument ◽  
Solar Uv Radiation ◽  
Solar Noon ◽  
Solar Uv ◽  
Ozone Monitoring ◽  
Absorbing Aerosols ◽  
Satellite Instruments

Abstract. Spectral solar UV radiation measurements are performed in France using three spectroradiometers located at very different sites. One is installed in Villeneuve d'Ascq, in the north of France (VDA). It is an urban site in a topographically flat region. Another instrument is installed in Observatoire de Haute-Provence, located in the southern French Alps (OHP). It is a rural mountainous site. The third instrument is installed in Saint-Denis, Réunion Island (SDR). It is a coastal urban site on a small mountainous island in the southern tropics. The three instruments are affiliated with the Network for the Detection of Atmospheric Composition Change (NDACC) and carry out routine measurements to monitor the spectral solar UV radiation and enable derivation of UV index (UVI). The ground-based UVI values observed at solar noon are compared to similar quantities derived from the Ozone Monitoring Instrument (OMI, onboard the Aura satellite) and the second Global Ozone Monitoring Experiment (GOME-2, onboard the Metop-A satellite) measurements for validation of these satellite-based products. The present study concerns the period 2009–September 2012, date of the implementation of a new OMI processing tool. The new version (v1.3) introduces a correction for absorbing aerosols that were not considered in the old version (v1.2). Both versions of the OMI UVI products were available before September 2012 and are used to assess the improvement of the new processing tool. On average, estimates from satellite instruments always overestimate surface UVI at solar noon. Under cloudless conditions, the satellite-derived estimates of UVI compare satisfactorily with ground-based data: the median relative bias is less than 8 % at VDA and 4 % at SDR for both OMI v1.3 and GOME-2, and about 6 % for OMI v1.3 and 2 % for GOME-2 at OHP. The correlation between satellite-based and ground-based data is better at VDA and OHP (about 0.99) than at SDR (0.96) for both space-borne instruments. For all sky conditions, the median relative biases are much larger, with large dispersion for both instruments at all sites (VDA: about 12 %; OHP: 9 %; SDR: 11 %). Correlation between satellite-based and ground-based data is still better at VDA and OHP (about 0.95) than at SDR (about 0.73) for both satellite instruments. These results are explained considering the time of overpass of the two satellites, which is far from solar noon, preventing a good estimation of the cloud cover necessary for a good modelling of the UVI. Site topography and environment are shown to have a non-significant influence. At VDA and OHP, OMI v1.3 shows a significant improvement with respect to v1.2, which did not account for absorbing aerosols.

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 Ground-Based Solar UV Radiation Monitoring Technique Using Photocell

1970 ◽  
Vol 8 (3) ◽  
pp. 177-189
Author(s):  
Paribesh Koirala ◽  
Raj K Tripathee ◽  
Nitesh Pandey
Keyword(s):  
Embedded System ◽  
Uv Radiation ◽  
Radiation Monitoring ◽  
Programming Technique ◽  
Uv Index ◽  
Solar Uv Radiation ◽  
Monitoring Technique ◽  
Solar Uv ◽  
Photo Voltaic ◽  
Voltaic Cell

This paper presents Solar UV radiation monitoring technique using a photo voltaic cell. The data obtained by such technique can be used to calculate the UV index and measure risk of UV exposure. UV irradiance at the surface is affected by the solar elevation, total ozone, clouds, aerosol, surface albedo etc. This paper presents results from the designed instrument to evaluate the UV index. The data obtained from such method will have benefit in installation, maintenance, data transfer and operational cost. This paper highlights the development and initial validation of standard UV data along with the portable embedded device for personalized UV monitoring which is based on a novel programming technique, photo Voltaic Cell as UV sensor, and a microcontroller PIC16F877A. This portable personalized UV monitoring device just provides the tentative UVI as it does not take the depth of ozone layer into account. Rough estimation of UVI can be obtained with such embedded system. DOI: http://dx.doi.org/10.3126/jie.v8i3.5943 JIE 2011; 8(3): 177-189

scholarly journals Biologically effective doses of ambient solar-UV radiation in Indonesia and Japan

2000 ◽  
pp. 123 ◽  
Author(s):  
Nobuo Munakata ◽  
Santoso Cornain ◽  
Ketut Mulyadi ◽  
Masamitsu Ichihashi ◽  
Joedo Prihartono ◽  
...  
Keyword(s):  
Uv Radiation ◽  
Solar Uv Radiation ◽  
Solar Uv ◽  
Effective Doses

Solar UV radiation variations and their stratospheric and climatic effects

1985 ◽  
Vol 5 (6) ◽  
pp. 145-148 ◽  
Author(s):  
Richard F. Donnelly ◽  
Donald F. Heath
Keyword(s):  
Uv Radiation ◽  
Climatic Effects ◽  
Solar Uv Radiation ◽  
Solar Uv

scholarly journals Interaction between variable solar UV radiation and tropospheric circulations as a possible cause of five year oscillation in Earth rotation

2000 ◽  
pp. 51-56
Author(s):  
P. Jovanovic ◽  
D. Djurovic
Keyword(s):  
Uv Radiation ◽  
Earth Rotation ◽  
Solar Uv Radiation ◽  
Solar Uv ◽  
Possible Cause

It is shown that Five Year Oscillation in Earth rotation is possibly caused by variable solar UV radiation and a corresponding perturbation mechanism is suggested.

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