Comparison of total ozone and erythemal UV data from OMI with ground-based measurements at Rome station

Abstract

Abstract. Ground-based total ozone and surface UV irradiance measurements have been collected since 1992 using Brewer spectrophotometer at Rome station. Erythemal Dose Rates (EDRs) have been also determined by a broad-band radiometer (model YES UVB-1) operational since 2000. The methodology to retrieve the EDR and the Erythemal Daily Dose (EDD) from the radiometer observations is described. Ground-based measurements were compared with satellitederived total ozone and UV data from the Ozone Monitoring Instrument (OMI). OMI, onboard the NASA EOS Aura spacecraft, is a nadir viewing spectrometer that provides total ozone and surface UV retrievals. The results of the validation exercise showed satisfactory agreement between OMI and Brewer total ozone data, for both OMI-TOMS and OMI-DOAS ozone algorithms (biases of −1.8% and −0.7%, respectively). Regarding UV data, OMI data overestimate ground based erythemally weighted UV irradiances retrieved from both Brewer and YES Radiometer (biases about 20%). The effect of aerosols on UV comparisons was investigated in terms of Aerosol Optical Depth (AOD), showing mediumlarge correlation at SZA larger than 55 • . Further sources of uncertainty, such as the difference in the atmospheric conditions between local noon and OMI overpass time and the OMI spatial resolution, were also discussed.

Spatial and temporal UV irradiance and aerosol variability within the area of an OMI satellite pixel

“…2 and Table 1 show that the main problem when comparing OMI and GB measurements for urban areas is the OMI UV overestimation as described in detail in Tanskanen et al (2008), Kazadzis et al (2009) and Ialongo et al (2008). When averaging OMI and GB measurements for each site and for the whole campaign period the OMI overestimation is similar to the one reported by Kazadzis et al (2009) less overestimation for 380 nm in agreement with the results in Kazadzis et al (2009).…”

“…Satellite ozone and UV data were exhaustively validated by means of GB measurements, regarding TOMS; (Kalliskota et al, 2000;McKenzie et al, 2001;Krotkov et al, 2001;Fioletov et al, 2002;Meloni et al, 2005;Arola et al, 2005;Kazantzidis et al, 2006) and lately OMI; Ialongo et al, 2008;Weihs et al, 2008;Kazadzis et al, 2009;Buchard et al, 2008). All these validation studies converge to the following conclusions:…”

Radiação Ultravioleta, Ozônio Total E Aerossóis Na Cidade De Natal-Rn

“…Deste modo o teor máximo de ozônio é observado na primavera, no verão diminui e novamente aumenta no outono [9,63,64]. Ressalta-se que a média anual de ozônio total de 265,4 UD obtida neste estudo está abaixo de pesquisas anteriores que indicaram uma média anual de 275 UD [64] e 268 UD [65].…”

Investigation of SO2Effect on TOMS O3Retrieval from OMI Measurement in China

“…특히 이산화황의 양 이 매우 높게 존재하는 화산 구름 내에서 TOMS 알고리 즘을 이용한 오존 산출에 이산화황이 영향을 주는 것으 로 보고되고 있다 (Krueger, 1983;McPeters et al, 1984;Korean Journal of Remote Sensing, Vol.32, No.6, 2016 -6 30 - Kroon et al, 2008;Choi et al, 2015). 로마, 프랑스, 스페인, 서울에서 이와 같은 유사한 비교 연구가 수행 된 바 있다 (Ialongo et al, 2008;Buchard et al, 2008;Antón et al,, 2009;Hong et al,, 2014). -6 32 - …”