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Estimating Cloud and Aerosol UV Modification Factors Based on Spectral Measurement from the Brewer Spectrophotometer. ATMOSPHERE 2017. [DOI: 10.3390/atmos8060109] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Cordero RR, Seckmeyer G, Damiani A, Riechelmann S, Rayas J, Labbe F, Laroze D. The world's highest levels of surface UV. Photochem Photobiol Sci 2014; 13:70-81. [DOI: 10.1039/c3pp50221j] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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High residential sun exposure is associated with a low risk of incident Crohn's disease in the prospective E3N cohort. Inflamm Bowel Dis 2014; 20:75-81. [PMID: 24247650 DOI: 10.1097/01.mib.0000436275.12131.4f] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
BACKGROUND Vitamin D insufficiency has been suggested to be associated with high risk of Crohn's disease (CD). In France, where food fortification is limited, the major source of vitamin D is through sun exposure. The aim of this work was to analyze the relationship between residential sun exposure and the risk of incident CD or ulcerative colitis (UC). METHODS The E3N cohort consists of women living in France, aged 40 to 65 years and free of major diseases at inclusion in 1990. Among the 91,870 women included in the study, we identified 123 incident cases (45 CD, 71 UC, and 7 indeterminate colitis). To assess residential sun exposure, we used a database containing mean daily ultraviolet radiation (UVR) dose for each French county. The relationship between residential sun exposure and risk of incident inflammatory bowel diseases was explored using Cox models. RESULTS Higher levels of residential sun exposure were associated with a significant decreased risk of CD (hazard ratio [HR] for the third versus the first tertile of UVR dose, 0.49; 95% confidence interval (CI), 0.23-1.01; P for trend = 0.04), but not of UC (HR, 1.21; CI, 0.61-2.11). In women with available data on dietary vitamin D intake, we observed a lower risk of CD with higher residential UVR (HR, 0.29; 95% CI, 0.11-0.80; P for trend = 0.01). Dietary vitamin D intake was neither associated with the risk of CD (HR, 0.41; 95% CI, 0.14-1.24; P for trend = 0.14) nor UC (HR, 1.61; CI, 0.61-4.23). CONCLUSIONS In this prospective cohort of women, high residential sunlight exposure was associated with decreased incidence of CD, but not UC.
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A New Algorithm for the Satellite-Based Retrieval of Solar Surface Irradiance in Spectral Bands. REMOTE SENSING 2012. [DOI: 10.3390/rs4030622] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Seckmeyer G, Klingebiel M, Riechelmann S, Lohse I, McKenzie RL, Liley JB, Allen MW, Siani AM, Casale GR. A critical assessment of two types of personal UV dosimeters. Photochem Photobiol 2011; 88:215-22. [PMID: 22017203 DOI: 10.1111/j.1751-1097.2011.01018.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Doses of erythemally weighted irradiances derived from polysulphone (PS) and electronic ultraviolet (EUV) dosimeters have been compared with measurements obtained using a reference spectroradiometer. PS dosimeters showed mean absolute deviations of 26% with a maximum deviation of 44%, the calibrated EUV dosimeters showed mean absolute deviations of 15% (maximum 33%) around noon during several test days in the northern hemisphere autumn. In the case of EUV dosimeters, measurements with various cut-off filters showed that part of the deviation from the CIE erythema action spectrum was due to a small, but significant sensitivity to visible radiation that varies between devices and which may be avoided by careful preselection. Usually the method of calibrating UV sensors by direct comparison to a reference instrument leads to reliable results. However, in some circumstances the quality of measurements made with simple sensors may be over-estimated. In the extreme case, a simple pyranometer can be used as a UV instrument, providing acceptable results for cloudless skies, but very poor results under cloudy conditions. It is concluded that while UV dosimeters are useful for their design purpose, namely to estimate personal UV exposures, they should not be regarded as an inexpensive replacement for meteorological grade instruments.
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Affiliation(s)
- Gunther Seckmeyer
- Institute of Meteorology and Climatology, Leibniz University of Hannover, Hannover, Germany.
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Engel P, Fagherazzi G, Mesrine S, Boutron-Ruault MC, Clavel-Chapelon F. Joint effects of dietary vitamin D and sun exposure on breast cancer risk: results from the French E3N cohort. Cancer Epidemiol Biomarkers Prev 2010; 20:187-98. [PMID: 21127286 DOI: 10.1158/1055-9965.epi-10-1039] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Ecological studies have suggested that vitamin D production through ultraviolet (UV) solar irradiance could reduce breast cancer (BC) risk. Although studies restricted to dietary vitamin D intake have provided inconsistent results, little is known about the relationship between pre- and postmenopausal BC and combined intakes from diet, supplements, and sun exposure. METHODS Cox proportional hazards regression models evaluated the association between vitamin D intakes, mean daily ultraviolet radiation dose (UVRd) at the place of residence and risk of BC among 67,721 women of the French E3N cohort. All analyses were stratified on menopausal status taking into account important confounders including calcium consumption. RESULTS During 10 years of follow-up, a total of 2,871 BC cases were diagnosed. Dietary and supplemental vitamin D intakes were not associated with BC risk; however, in regions with the highest UVRd, postmenopausal women with high dietary or supplemental vitamin D intake had a significantly lower BC risk as compared with women with the lowest vitamin D intake (HR = 0.68, 95% CI: 0.54-0.85, and HR = 0.57, 95% CI: 0.36-0.90, respectively). CONCLUSION Our results suggest that a threshold of vitamin D exposure from both sun and diet is required to prevent BC and this threshold is particularly difficult to reach in postmenopausal women at northern latitudes where quality of sunlight is too poor for adequate vitamin D production. IMPACT Prospective studies should further investigate associations between BC risk, vitamin D status and sunlight exposure.
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Affiliation(s)
- Pierre Engel
- Inserm, CESP Centre for Research in Epidemiology and Population Health, U1018, Nutrition, Hormones and Women's Health Team, F-94805, Villejuif, France
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Lindfors A, Heikkilä A, Kaurola J, Koskela T, Lakkala K. Reconstruction of solar spectral surface UV irradiances using radiative transfer simulations. Photochem Photobiol 2009; 85:1233-9. [PMID: 19496987 DOI: 10.1111/j.1751-1097.2009.00578.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
UV radiation exerts several effects concerning life on Earth, and spectral information on the prevailing UV radiation conditions is needed in order to study each of these effects. In this paper, we present a method for reconstruction of solar spectral UV irradiances at the Earth's surface. The method, which is a further development of an earlier published method for reconstruction of erythemally weighted UV, relies on radiative transfer simulations, and takes as input (1) the effective cloud optical depth as inferred from pyranometer measurements of global radiation (300-3000 nm); (2) the total ozone column; (3) the surface albedo as estimated from measurements of snow depth; (4) the total water vapor column; and (5) the altitude of the location. Reconstructed daily cumulative spectral irradiances at Jokioinen and Sodankylä in Finland are, in general, in good agreement with measurements. The mean percentage difference, for instance, is mostly within +/-8%, and the root mean square of the percentage difference is around 10% or below for wavelengths over 310 nm and daily minimum solar zenith angles (SZA) less than 70 degrees . In this study, we used pseudospherical radiative transfer simulations, which were shown to improve the performance of our method under large SZA (low Sun).
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Affiliation(s)
- Anders Lindfors
- Climate Change Research, Finnish Meteorological Institute, Helsinki, Finland.
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Antón M, Serrano A, Cancillo ML, García JA. Experimental and forecasted values of the ultraviolet index in southwestern Spain. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2008jd011304] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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di Sarra A, Fua D, Cacciani M, Di Iorio T, Disterhoft P, Meloni D, Monteleone F, Piacentino S, Sferlazzo D. Determination of ultraviolet cosine-corrected irradiances and aerosol optical thickness by combined measurements with a Brewer spectrophotometer and a multifilter rotating shadowband radiometer. APPLIED OPTICS 2008; 47:6142-6150. [PMID: 19023377 DOI: 10.1364/ao.47.006142] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Combined measurements of diffuse-to-global radiation ratio and global spectral irradiances in the UV are used to derive cosine-corrected UV irradiances and aerosol optical depth (AOD). The diffuse-to-global radiation ratio is used first in the cosine correction of the global irradiance, then to calculate absolutely calibrated direct irradiances. The Beer-Lambert law is applied to derive the UV AOD using independent measurements of the extraterrestrial solar flux. The AOD can be derived with an uncertainty of about 0.03 at 60 degrees solar zenith angle. The method was applied to measurements obtained with two UV multifilter rotating shadowband radiometers (UV-MFRSRs) and a MK III Brewer spectrophotometer on the Island of Lampedusa in the Central Mediterranean during two periods of 2002 and 2004. The derived AOD at 318 and 332 nm was compared with UV AOD measured at 318, 320, and 368 nm with different techniques. The retrieved AOD, combining MFRSR and Brewer measurements, is in good agreement with the optical depth derived with the other methods.
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Affiliation(s)
- Alcide di Sarra
- ENEA-ACS, Via Anguillarese 301, 00123 S Maria di Galeria, Italy.
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Lindfors A, Kaurola J, Arola A, Koskela T, Lakkala K, Josefsson W, Olseth JA, Johnsen B. A method for reconstruction of past UV radiation based on radiative transfer modeling: Applied to four stations in northern Europe. ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2007jd008454] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Cancillo ML, Serrano A, Antón M, García JA, Vilaplana JM, Morena B. An Improved Outdoor Calibration Procedure for Broadband Ultraviolet Radiometers¶. Photochem Photobiol 2007. [DOI: 10.1111/j.1751-1097.2005.tb01454.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kift R, Webb AR, Page J, Rimmer J, Janjai S. A Web-based tool for UV irradiance data: predictions for European and Southeast Asian sites. Photochem Photobiol 2006; 82:579-86. [PMID: 16613516 DOI: 10.1562/2005-04-20-ra-494] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
There are a range of UV models available, but one needs significant pre-existing knowledge and experience in order to be able to use them. In this article a comparatively simple Web-based model developed for the SoDa (Integration and Exploitation of Networked Solar Radiation Databases for Environment Monitoring) project is presented. This is a clear-sky model with modifications for cloud effects. To determine if the model produces realistic UV data the output is compared with 1 year sets of hourly measurements at sites in the United Kingdom and Thailand. The accuracy of the output depends on the input, but reasonable results were obtained with the use of the default database inputs and improved when pyranometer instead of modeled data provided the global radiation input needed to estimate the UV. The average modeled values of UV for the UK site were found to be within 10% of measurements. For the tropical sites in Thailand the average modeled values were within 1120% of measurements for the four sites with the use of the default SoDa database values. These results improved when pyranometer data and TOMS ozone data from 2002 replaced the standard SoDa database values, reducing the error range for all four sites to less than 15%.
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Affiliation(s)
- Richard Kift
- University of Manchester, SEAES, Manchester, United Kingdom.
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Petkov B, Vitale V, Tomasi C, Bonafé U, Scaglione S, Flori D, Santaguida R, Gausa M, Hansen G, Colombo T. Narrowband filter radiometer for ground-based measurements of global ultraviolet solar irradiance and total ozone. APPLIED OPTICS 2006; 45:4383-95. [PMID: 16778947 DOI: 10.1364/ao.45.004383] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
The ultraviolet narrowband filter radiometer (UV-RAD) designed by the authors to take ground-based measurements of UV solar irradiance, total ozone, and biological dose rate is described, together with the main characteristics of the seven blocked filters mounted on it, all of which have full widths at half maxima that range 0.67 to 0.98 nm. We have analyzed the causes of cosine response and calibration errors carefully to define the corresponding correction terms, paying particular attention to those that are due to the spectral displacements of the filter transmittance peaks from the integer wavelength values. The influence of the ozone profile on the retrieved ozone at large solar zenith angles has also been examined by means of field measurements. The opportunity of carrying out nearly monochromatic irradiance measurements offered by the UV-RAD allowed us to improve the procedure usually followed to reconstruct the solar spectrum at the surface by fitting the computed results, using radiative transfer models with field measurements of irradiance. Two long-term comparison campaigns took place, showing that a mean discrepancy of +0.3% exists between the UV-RAD total ozone values and those given by the Brewer #63 spectroradiometer and that mean differences of +0.3% and -0.9% exist between the erythemal dose rates determined with the UV-RAD and those obtained with the Brewer #63 and the Brewer #104 spectroradiometers, respectively.
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Affiliation(s)
- Boyan Petkov
- Institute of Atmospheric Sciences and Climate, Italian National Research Council, Bologna, Italy.
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Bernhard G, Booth CR, Ehramjian JC, Nichol SE. UV climatology at McMurdo Station, Antarctica, based on version 2 data of the National Science Foundation's Ultraviolet Radiation Monitoring Network. ACTA ACUST UNITED AC 2006. [DOI: 10.1029/2005jd005857] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Kahnert M. Spherical and spheroidal model particles as an error source in aerosol climate forcing and radiance computations: A case study for feldspar aerosols. ACTA ACUST UNITED AC 2005. [DOI: 10.1029/2004jd005558] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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16
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Bernhard G. Bias in Dobson total ozone measurements at high latitudes due to approximations in calculations of ozone absorption coefficients and air mass. ACTA ACUST UNITED AC 2005. [DOI: 10.1029/2004jd005559] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Lindfors A. Erythemal UV at Davos (Switzerland), 1926–2003, estimated using total ozone, sunshine duration, and snow depth. ACTA ACUST UNITED AC 2005. [DOI: 10.1029/2004jd005231] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Cancillo ML, Serrano A, Antón M, García JA, Vilaplana JM, de la Morena B. An Improved Outdoor Calibration Procedure for Broadband Ultraviolet Radiometers¶. Photochem Photobiol 2005. [DOI: 10.1562/2005-01-12-ra-412r.1] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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19
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Pace G, Meloni D, di Sarra A. Forest fire aerosol over the Mediterranean basin during summer 2003. ACTA ACUST UNITED AC 2005. [DOI: 10.1029/2005jd005986] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Bernhard G, Booth CR, Ehramjian JC. Version 2 data of the National Science Foundation's Ultraviolet Radiation Monitoring Network: South Pole. ACTA ACUST UNITED AC 2004. [DOI: 10.1029/2004jd004937] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- G. Bernhard
- Biospherical Instruments Inc.; San Diego California USA
| | - C. R. Booth
- Biospherical Instruments Inc.; San Diego California USA
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Meloni D. Direct radiative forcing of Saharan dust in the Mediterranean from measurements at Lampedusa Island and MISR space-borne observations. ACTA ACUST UNITED AC 2004. [DOI: 10.1029/2003jd003960] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Kahnert M. Radiance and flux simulations for mineral dust aerosols: Assessing the error due to using spherical or spheroidal model particles. ACTA ACUST UNITED AC 2004. [DOI: 10.1029/2003jd004318] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Webb AR. Airborne measurements of ground and cloud spectral albedos under low aerosol loads. ACTA ACUST UNITED AC 2004. [DOI: 10.1029/2004jd004768] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Høiskar BAK, Haugen R, Danielsen T, Kylling A, Edvardsen K, Dahlback A, Johnsen B, Blumthaler M, Schreder J. Multichannel moderate-bandwidth filter instrument for measurement of the ozone-column amount, cloud transmittance, and ultraviolet dose rates. APPLIED OPTICS 2003; 42:3472-3479. [PMID: 12833946 DOI: 10.1364/ao.42.003472] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A six-channel moderate-bandwidth filter instrument for measurement of UV and visible radiation has been developed. The characteristic of the instrument are described, including the spectral and the angular responses. Furthermore the calibration procedure is outlined. Combining information from several channels, one may determine the total ozone-column amount, various biological dose rates, a cloud transmission factor, and the effective cloud optical depth. The methods used to determine these parameters are presented, and the measured parameters are compared with similar ones obtained from other instruments. The total ozone as measured by the instrument agrees with measurements from a standard Brewer to -0.05% +/- 2.04% over a two-year period. Two weeks of cloudless Commission Internationale de L'Eclairage dose rates agree with those from a Bentham double monochromator spectroradiometer to 0.99 +/- 0.03.
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Meloni D. Tropospheric aerosols in the Mediterranean: 2. Radiative effects through model simulations and measurements. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2002jd002807] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Bais AF. International Photolysis Frequency Measurement and Model Intercomparison (IPMMI): Spectral actinic solar flux measurements and modeling. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2002jd002891] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Meloni D. Tropospheric aerosols in the Mediterranean: 3. Measurements and modeling of actinic radiation profiles. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2002jd003293] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Cantrell CA. Overview and conclusions of the International Photolysis Frequency Measurement and Modeling Intercomparison (IPMMI) study. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2002jd002962] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Lindfors AV. Long-term erythemal UV doses at Sodankylä estimated using total ozone, sunshine duration, and snow depth. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2002jd003325] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Cede A, Luccini E, Nuñez L, Piacentini RD, Blumthaler M. Calibration and uncertainty estimation of erythemal radiometers in the argentine ultraviolet monitoring network. APPLIED OPTICS 2002; 41:6341-6350. [PMID: 12396183 DOI: 10.1364/ao.41.006341] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The erythemal radiometers of the Ultraviolet Monitoring Network of the Argentine Servicio Meteorológico Nacional were calibrated in an extensive in situ campaign from October 1998 to April 1999 with Austrian reference instruments. Methods to correct the influence of the location's horizon and long-term detector changes are applied. The different terms that contribute to the measurement uncertainty are analyzed. The expanded uncertainty is estimated to be +/- 10% at 70 degrees solar zenith angle (SZA) and +/-6% for a SZA of <50 degrees. We observed significant changes for some detectors over hours and days, reaching a maximum diurnal drift of +/-5% at a SZA of 70 degrees and a maximum weekly variation of +/-4%.
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Affiliation(s)
- Alexander Cede
- Institute for Medical Physics, University of Innsbruck, Austria.
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32
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Arola A. Assessment of four methods to estimate surface UV radiation using satellite data, by comparison with ground measurements from four stations in Europe. ACTA ACUST UNITED AC 2002. [DOI: 10.1029/2001jd000462] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Hofzumahaus A. Solar actinic radiation (280–420 nm) in the cloud-free troposphere between ground and 12 km altitude: Measurements and model results. ACTA ACUST UNITED AC 2002. [DOI: 10.1029/2001jd900142] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Balis DS. Measurements and modeling of photolysis rates during the Photochemical Activity and Ultraviolet Radiation (PAUR) II campaign. ACTA ACUST UNITED AC 2002. [DOI: 10.1029/2000jd000136] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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di Sarra A. Effects of desert dust and ozone on the ultraviolet irradiance at the Mediterranean island of Lampedusa during PAUR II. ACTA ACUST UNITED AC 2002. [DOI: 10.1029/2000jd000139] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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36
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Cede A. Monitoring of erythemal irradiance in the Argentine ultraviolet network. ACTA ACUST UNITED AC 2002. [DOI: 10.1029/2001jd001206] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Krotkov NA, Herman JR, Bhartia PK, Fioletov V, Ahmad Z. Satellite estimation of spectral surface UV irradiance: 2. Effects of homogeneous clouds and snow. ACTA ACUST UNITED AC 2001. [DOI: 10.1029/2000jd900721] [Citation(s) in RCA: 97] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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39
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Gröbner J, Kerr JB. Ground-based determination of the spectral ultraviolet extraterrestrial solar irradiance: Providing a link between space-based and ground-based solar UV measurements. ACTA ACUST UNITED AC 2001. [DOI: 10.1029/2000jd900756] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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40
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Martin TJ, Gardiner BG, Seckmeyer G. Uncertainties in satellite-derived estimates of surface UV doses. ACTA ACUST UNITED AC 2000. [DOI: 10.1029/2000jd900432] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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41
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Degünther M, Meerkötter R. Influence of inhomogeneous surface albedo on UV irradiance: Effect of a stratus cloud. ACTA ACUST UNITED AC 2000. [DOI: 10.1029/2000jd900344] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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42
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Verdebout J. A method to generate surface UV radiation maps over Europe using GOME, Meteosat, and ancillary geophysical data. ACTA ACUST UNITED AC 2000. [DOI: 10.1029/1999jd900302] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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van Weele M, Martin TJ, Blumthaler M, Brogniez C, den Outer PN, Engelsen O, Lenoble J, Mayer B, Pfister G, Ruggaber A, Walravens B, Weihs P, Gardiner BG, Gillotay D, Haferl D, Kylling A, Seckmeyer G, Wauben WMF. From model intercomparison toward benchmark UV spectra for six real atmospheric cases. ACTA ACUST UNITED AC 2000. [DOI: 10.1029/1999jd901103] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Meleti C, Cappellani F. Measurements of aerosol optical depth at Ispra: Analysis of the correlation with UV-B, UV-A, and total solar irradiance. ACTA ACUST UNITED AC 2000. [DOI: 10.1029/1999jd900459] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Thorseth TM, Kjeldstad B, Johnsen B. Comparison of solar UV measurements performed with spectroradiometer and moderate bandwidth multichannel radiometer for different cloud conditions. ACTA ACUST UNITED AC 2000. [DOI: 10.1029/1999jd900480] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Kylling A, Persen T, Mayer B, Svenøe T. Determination of an effective spectral surface albedo from ground-based global and direct UV irradiance measurements. ACTA ACUST UNITED AC 2000. [DOI: 10.1029/1999jd900304] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Wang P, Li Z, Cihlar J, Wardle DI, Kerr J. Validation of an UV inversion algorithm using satellite and surface measurements. ACTA ACUST UNITED AC 2000. [DOI: 10.1029/1999jd900403] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Lapeta B, Engelsen O, Litynska Z, Kois B, Kylling A. Sensitivity of surface UV radiation and ozone column retrieval to ozone and temperature profiles. ACTA ACUST UNITED AC 2000. [DOI: 10.1029/1999jd900417] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Schwander H, Mayer B, Ruggaber A, Albold A, Seckmeyer G, Koepke P. Method to determine snow albedo values in the ultraviolet for radiative transfer modeling. APPLIED OPTICS 1999; 38:3869-3875. [PMID: 18319993 DOI: 10.1364/ao.38.003869] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
For many cases modeled and measured UV global irradiances agree to within +/-5% for cloudless conditions, provided that all relevant parameters for describing the atmosphere and the surface are well known. However, for conditions with snow-covered surfaces this agreement is usually not achievable, because on the one hand the regional albedo, which has to be used in a model, is only rarely available and on the other hand UV irradiance alters with different snow cover of the surface by as much as 50%. Therefore a method is given to determine the regional albedo values for conditions with snow cover by use of a parameterization on the basis of snow depth and snow age, routinely monitored by the weather services. An algorithm is evolved by multiple linear regression between the snow data and snow-albedo values in the UV, which are determined from a best fit of modeled and measured UV irradiances for an alpine site in Europe. The resulting regional albedo values in the case of snow are in the 0.18-0.5 range. Since the constants of the regression depend on the area conditions, they have to be adapted if the method is applied for other sites. Using the algorithm for actual cases with different snow conditions improves the accuracy of modeled UV irradiances considerably. Compared with the use of an average, constant snow albedo, the use of actual albedo values, provided by the algorithm, halves the average deviations between measured and modeled UV global irradiances.
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Affiliation(s)
- H Schwander
- Meteorological Institute of the University of Munich, Theresienstrasse 37, D-80333, München, Germany.
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Bernhard G, Seckmeyer G. Uncertainty of measurements of spectral solar UV irradiance. ACTA ACUST UNITED AC 1999. [DOI: 10.1029/1999jd900180] [Citation(s) in RCA: 129] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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