Pham Thi Thuy Duong, Pham Thi Thanh Nga, Do Trung Truc

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Ozone and ultraviolet radiation (UV) make direct influences on human health on the Earth. Various satellites have been launched for collecting data of these two parameters. In this study, observations of daily average of total ozone and ultraviolet radiation by OMI satellite (Ozone Monitoring Instrument) are processed and compared with surface measurements at Hanoi station during two years of 2018-2019 for their quality evaluation and analyses. The results showed that OMI data had high correlation with surface measurements: 0,89 for total ozone and 0,70 for UV radiation, convincing their realibity for spatial and temporal variation analyses for Vietnam region. Negative Mean bias error (MBE) and right hand inclination of scatter plot indicated that OMI data underestimated both total ozone and UV radiation of surface observations. Spatial analyses revealed that factors including geographic locations, topography, and season are influencing on spatial and temporal variations of total ozone and UV radiation. Specifically, UV radiaiton is not in linear relation with total ozone, but in logarithm function. There is variation in correlation values by seasons and in space, particularly lower in Mekong River Delta region.

Keywords: Ozone, ultraviolet radiation, OMI satellite, ozone variation.


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