- Volume 36 Issue 3
DOI QR Code
The Cross-validation of Satellite OMI and OMPS Total Ozone with Pandora Measurement
지상 Pandora와 위성 OMI와 OMPS 오존관측 자료의 상호검증 방법에 대한 분석 연구
- Baek, Kanghyun (Research Center for Climate Sciences, Pusan National University) ;
- Kim, Jae-Hwan (Department of Atmospheric Science, Pusan National University) ;
- Kim, Jhoon (Department of Atmospheric Science, Yonsei University)
- Received : 2020.05.19
- Accepted : 2020.06.17
- Published : 2020.06.30
Korea launched Geostationary Environmental Monitoring Satellite (GEMS), a UV/visible spectrometer that measure pollution gases on 18 February 2020. Because satellite retrieval is an ill-posed inverse solving process, the validation with ground-based measurements or other satellite measurements is essential to obtain reliable products. For this purpose, satellite-based OMI and OMPS total column ozone (TCO), and ground-based Pandora TCO in Busan and Seoul were selected for future GEMS validation. First of all, the goal of this study is to validate the ground ozone data using characteristics that satellite data provide coherent ozone measurements on a global basis, although satellite data have a larger error than the ground-based measurements. In the cross validation between Pandora and OMI TCO, we have found abnormal deviation in ozone time series from Pandora #29 observed in Seoul. This shows that it is possible to perform inverse validation of ground data using satellite data. Then OMPS TCO was compared with verified Pandora TCO. Both data shows a correlation coefficient of 0.97, an RMSE of less than 2 DU and the OMPS-Pandora relative mean difference of >4%. The result also shows the OMPS-Pandora relative mean difference with SZA, TCO, cross-track position and season have insignificant dependence on those variables.In addition, we showed that appropriate thresholds depending on the spatial resolution of each satellite sensor are required to eliminate the impact of the cloud on Pandora TCO.
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