2003 North American interagency intercomparison of ultraviolet spectroradiometers: scanning and spectrograph instruments.

Lantz, Kathleen

doi:10.1117/1.3040299

Cited by 8 publications

(8 citation statements)

References 32 publications

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“…The instrument's irradiance collector consists of a polytetrafluoroethylene (PTFE) diffuser covering the entrance port of an integrating sphere, resulting in a cosine error of less than 2 % for incidence angles smaller than 75 • . The instrument took part in the fifth North American Interagency Intercomparison for UV Spectroradiometers in 2003 (Wuttke et al, 2006;Lantz et al, 2008). The instrument at Barrow is an SUV-100 spectroradiometer from BSI and was installed in 1991 (Bernhard et al, 2007).…”

Section: Instruments and Measurement Protocolsmentioning

confidence: 99%

High levels of ultraviolet radiation observed by ground-based instruments below the 2011 Arctic ozone hole

et al. 2013

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Abstract. Greatly increased levels of ultraviolet (UV) radiation were observed at thirteen Arctic and sub-Arctic ground stations in the spring of 2011, when the ozone abundance in the Arctic stratosphere dropped to the lowest amounts on record. Measurements of the noontime UV Index (UVI) during the low-ozone episode exceeded the climatological mean by up to 77% at locations in the western Arctic (Alaska, Canada, Greenland) and by up to 161% in Scandinavia. The UVI measured at the end of March at the Scandinavian sites was comparable to that typically observed 15–60 days later in the year when solar elevations are much higher. The cumulative UV dose measured during the period of the ozone anomaly exceeded the climatological mean by more than two standard deviations at 11 sites. Enhancements beyond three standard deviations were observed at seven sites and increases beyond four standard deviations at two sites. At the western sites, the episode occurred in March, when the Sun was still low in the sky, limiting absolute UVI anomalies to less than 0.5 UVI units. At the Scandinavian sites, absolute UVI anomalies ranged between 1.0 and 2.2 UVI units. For example, at Finse, Norway, the noontime UVI on 30 March was 4.7, while the climatological UVI is 2.5. Although a UVI of 4.7 is still considered moderate, UV levels of this amount can lead to sunburn and photokeratitis during outdoor activity when radiation is reflected upward by snow towards the face of a person or animal. At the western sites, UV anomalies can be well explained with ozone anomalies of up to 41% below the climatological mean. At the Scandinavian sites, low ozone can only explain a UVI increase of 50–60%. The remaining enhancement was mainly caused by the absence of clouds during the low-ozone period.

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Section: Instruments and Measurement Protocolsmentioning

confidence: 99%

High levels of ultraviolet radiation observed by ground-based instruments below the 2011 Arctic ozone hole

et al. 2013

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“…Travelling instruments have been developed and several calibration facilities exist nowadays . Moreover, some instrument comparisons have been organized all over the world (Leszczynski et al, 1998;Bais et al, 2000;Hülsen and Gröbner, 2007;Lantz et al, 2008) and have proven to be very successful in pointing out instrumental malfunctioning or data processing inaccuracies.…”

Section: Introductionmentioning

confidence: 99%

“…This will help to control whether the Montreal Protocol targets are fulfilled and the model predictions are correct. Moreover, quality ground-based instruments, traceable to a common reference, allow to validate satellite data mainly over polluted locations (Lee-Taylor et al, 2010) or at sites with a complex orography.…”

Section: Introductionmentioning

confidence: 99%

First national intercomparison of solar ultraviolet radiometers in Italy

et al. 2011

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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 base of their own procedures and calibration data. A radiative transfer model was successfully applied as an interpretative tool. The input parameters and output results are described in detail. The comparison was performed in terms of global solar UV Index and integrated UV-A irradiance against a wellcalibrated double monochromator spectroradiometer as reference. An improved algorithm for comparing broadband data and spectra has been developed and is discussed in detail. 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 were found for the instruments calibrated in the manufacturers' facilities and never involved in field intercomparison. Finally, some recommendations to the UV operators based on the campaign results are proposed.

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“…The calibration of the RS is based on a 1000 W tungsten halogen lamp, which was calibrated by the Physikalisch-Technische Bundesanstalt (PTB). The RS is described in detail elsewhere and has been previously intercompared with other high accuracy spectroradiometers (6)(7)(8). The RS complies with the requirements for Network for the Detection of Atmospheric Composition Change (NDACC) instruments (8) Photochemistry and Photobiology, 2012, 88: 215-222 (WMO) (9).…”

Section: Methodsmentioning

confidence: 99%

A Critical Assessment of Two Types of Personal UV Dosimeters

Seckmeyer

Klingebiel

Riechelmann

et al. 2011

Photochem & Photobiology

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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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2003 North American interagency intercomparison of ultraviolet spectroradiometers: scanning and spectrograph instruments.

Cited by 8 publications

References 32 publications

High levels of ultraviolet radiation observed by ground-based instruments below the 2011 Arctic ozone hole

High levels of ultraviolet radiation observed by ground-based instruments below the 2011 Arctic ozone hole

First national intercomparison of solar ultraviolet radiometers in Italy

A Critical Assessment of Two Types of Personal UV Dosimeters

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