TOMS和OMI紫外辐照度数据的对比研究

臭氧总量测绘分光仪(TOMS)和臭氧总量测绘分光仪(OMI)是两个重要的已成功发射且涉及到紫外辐射波长的传感器,为紫外研究工作提供了重要的数据信息。但由于两者紫外产品的反演过程有资料和算法的一些区别使其在同一天的正午地表紫外辐射数据有一定差异,这使通过它们进行长时间尺度上的紫外辐射时空变化分析的精度和准确性受到一定影响。本文通过对相同时间段的两者正午地表紫外辐射数据进行对比分析,找到一个简单可行的方法使两者差异明显缩小。结果表明通过变换OMI紫外辐射值相对于TOMS紫外辐射值差异基本上调整到±10mW/m₂之间,说明该方法可以应用到后续OMI紫外数据上以便结合TOMS紫外数据进行整体紫外辐射时空变化研究。

Comparison between Ultraviolet irradiation data of TOMS and OMI

Total Ozone Mapping Spectrometer(TOMS)and Ozone Monitoring Instrument (OMI)are two sensors which have successfully launched and involved the ultraviolet wavelengths. They can provide important data and information for UV research work. However, there are some differences between their noon surface ultraviolet irradiation products on the same day because of the differences of information and algorithms between the OMI surface UV retrievals and the TOMS surface UV retrievals. And this will affect the precision and accuracy of spatial temporal variations of UV on long time scale. This paper found a simple and feasible method to make the differences between them narrowed considerably through comparing both noon surface ultraviolet irradiation data in the same period of time. Results show that through transformation the differences basically became ±10 mW/m₂between the OMI UV irradiation and the TOMS ultraviolet irradiation, which shows that this method can be applied to the subsequent OMI UV data to conduct the analysis of UV changes combining the TOMS UV data.