# Retrieval of Cloud Ice Water Path from FY-3F MWTS and MWHS
## 4 Results
### Comparison Between FY-3F Retrieval Results and METOP-C Products
Figure 12: Scatter plot comparing IWP data from FY-3F and METOP-C satellites. To further analyze the numerical distribution characteristics of IWP retrieved from both datasets in different regions, probability density distribution diagrams and cumulative distribution function curves were plotted for the typhoon and extratropical regions (Figure 14). These visualizations demonstrate that the central tendency of IWP values retrieved from the two datasets is relatively consistent across both regions. In the extratropical region, the mean IWP values retrieved from FY-3F and METOP-C data are 0.15 kg/m\({}^{2}\) and 0.18 kg/m\({}^{2}\), respectively, indicating close agreement. The FY-3F data shows a higher concentration of values in the lower range, possibly due to uncertainties at the edges of the scanning band, where the extratropical region lies. In the typhoon region, the mean IWP values retrieved from FY-3F and METOP-C data are 0.22 kg/m\({}^{2}\) and 0.23 kg/m\({}^{2}\), respectively, further underscoring the high consistency between the two datasets. These results confirm that the IWP retrieved from FY-3F data aligns closely with the METOP-C product. Figure 13: IWP retrieval results for typhoon and extratropical regions on July 24, 2024. Panel (**a**) shows the IWP retrieved from FY-3F observational data in the typhoon region, while panel (**b**) illustrates the corresponding IWP retrieval from METOP-C data. Similarly, panel (**c**) displays the IWP retrieved from FY-3F observational data in the extratropical region, and panel (**d**) presents the IWP retrieval from METOP-C data for the same region. This study analyzed the distribution characteristics of IWP retrieval results across different latitude bands using FY-3F and METOP-C observational data from June and July 2024. Statistical analyses of the IWP retrieved from the two datasets were performed across latitude bands, as shown in Figure 15. The results indicate that the IWP distribution characteristics retrieved from both datasets are relatively consistent across latitude bands. Between 60\({}^{\circ}\) and 35\({}^{\circ}\) latitude in both hemispheres, the IWP from both datasets exhibits a relatively stable variation. However, the peak IWP retrieved from FY-3F data occurs near 15\({}^{\circ}\)S, whereas the peak from METOP-C data is located near 7\({}^{\circ}\)S. This discrepancy in peak positions may stem from differences in observation times between the two datasets. Between 35\({}^{\circ}\)N and 60\({}^{\circ}\)N, the IWP values retrieved from FY-3F data are slightly lower than those from METOP-C, while in most other latitude ranges, the FY-3F values are slightly higher. The largest difference in IWP between the two datasets occurs at 15\({}^{\circ}\)S, with a maximum difference of 0.081 kg/m\({}^{2}\), while the smallest difference is at 59\({}^{\circ}\)N, with a minimum difference of 0.015 kg/m\({}^{2}\). Notably, both datasets exhibit relatively high peaks near 5\({}^{\circ}\)S, with a difference of 0.027 kg/m\({}^{2}\) in this latitude band. Overall, the IWP retrieval results from the two datasets show high consistency in their latitude band distributions, with differences remaining relatively small. The IWP retrieved from FY-3F data tends to be slightly higher than that from METOP-C data in most regions. This may be attributed to the higher resolution of FY-3F satellite observations, which capture more detailed IWP information. In contrast, the lower resolution of METOP-C satellite observations may result in the loss of some high-value regions in the IWP product, leading to the observed differences between the datasets. Figure 14: Probability Density Function (PDF) and Cumulative Distribution Function (CDF) of IWP for extratropical and typhoon regions on 24 July 2024. The left panel (**a**) corresponds to the extratropical region, while the right panel (**b**) represents the typhoon region. In these plots, blue bars and lines indicate IWP retrieved from FY-3F observational data, whereas cyan bars and lines represent the METOP-C IWP products.