Dr. Anna Maria Siani Profile

Dr. Anna Maria Siani

at Univ degli Studi di Roma La Sapienza

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Author

Publications (5)

Proceedings Article | 17 October 2013 Paper

Capability and limitations in measuring atmospheric nitrogen dioxide column amounts by means of the MKIV Brewer spectrophotometers

Henri Diémoz, Vladimir Savastiouk, Anna Maria Siani

Proceedings Volume 8890, 88900D (2013) https://doi.org/10.1117/12.2028704

KEYWORDS: NOx, Ozone, Spectrophotometry, Sun, Signal to noise ratio, Oxygen, Absorption, Atmospheric modeling, Radiative transfer, Computer simulations

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Proceedings Article | 12 October 2006 Paper

Surface UV radiation monitoring at two Italian Brewer stations (Rome and Ispra): a first comparison with OMI data

Anna Maria Siani, Iolanda Ialongo, Giuseppe Casale, Romina Giannini, Marco Cacciani

Proceedings Volume 6362, 63622G (2006) https://doi.org/10.1117/12.688267

KEYWORDS: Ultraviolet radiation, Ozone, Satellites, Spectrophotometry, Aerosols, Calibration, Lamps, Climatology, Meteorology, Atmospheric monitoring

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Proceedings Article | 4 November 2003 Paper

Temperature dependence of Brewer UV measurements at Rome station

Anna Siani, Giuseppe Benevento, Giuseppe Casale

Proceedings Volume 5156, (2003) https://doi.org/10.1117/12.505389

KEYWORDS: Ultraviolet radiation, Temperature metrology, Radiometry, Lamps, Calibration, Standards development, Climatology, Lanthanum, Ozone, Spectrophotometry

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Decreasing trends of total ozone affect mainly solar ultraviolet (UV) levels at ground level with adverse effects on the biosphere. Highly accurate measurements of solar UV irradiance have become an important issue to assess UV trends. To detect these trends stations with well calibrated instruments, with long-term stability and Quality Assurance (QA)/ Quality Control (QC) carefully followed procedures, are necessary. The Solar Radiometry Observatory of Rome, University “La Sapienza” (city center) is one of the stations regularly measuring UV irradiance in Italy. Measurements of UV spectral (290-325 nm) irradiance started in 1992, using Brewer MKIV 067. Measurements of total irradiance contained in the 280 - 320 nm waveband begun in 2000 with the YES UVB-1 broad-band radiometer. An investigation of the internal temperature dependence of the spectral responsivity to improve the quality of the Brewer UV data was carried out. The study was based on the analysis of responsivity files recorded during the years 2000-2002. Responsivities are provided by specific tests through a set of five 50 W quartz tungsten-halogen lamps, traceable to the standards of the National Institute of Standards and Technology (NIST). The lamp tests allow to measure any changes in the instrument response over time. It was observed that a decrease in the instrument's responsivity resulted from an increase of the internal temperature. A methodology based on a family of responsivity files at different temperature intervals is proposed to allow correction of UV irradiances using the responsivity file at the corresponding temperatures. The mean percentage differnce between temperature corrected and non-corrected Brewer data varies from 0.8% to 1.5% over an internal temperature of 8°C-42°C. In addition the results of a field evaluation in Rome between Brewer 067 and two temperature stabilized instruments, a broad-band radiometer (YES UVB-1) and a moderate bandwidth multichannel radiometer (Biospherical GUV-511C) were analyzed using temperature corrected spectral measurements.

SPIE Journal Paper | 1 December 2002

Investigation on a low ozone episode at the end of November 2000 and its effect on ultraviolet radiation

Anna Siani, Giuseppe Casale, Alessandro Galliani

OE, Vol. 41, Issue 12, (December 2002) https://doi.org/10.1117/12.10.1117/1.1516821

KEYWORDS: Ozone, Ultraviolet radiation, Atmospheric modeling, Optical engineering, Data centers, Radiation effects, Climatology, Diagnostics, Displays, Data modeling

Proceedings Article | 17 January 2002 Paper

Investigation on a low-ozone episode at the end of November 2000 and its effect on ultraviolet radiation

Alessandro Galliani, Anna Siani, Giuseppe Casale

Proceedings Volume 4482, (2002) https://doi.org/10.1117/12.452953

KEYWORDS: Ozone, Ultraviolet radiation, Atmospheric modeling, Radiation effects, Data modeling, Climatology, Lanthanum, Data centers, Physics, Environmental sensing

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