The high cloud cover modeled by the Interim ECMWF Re-Analysis (ERA-Interim) is compared against Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations(CALIPSO) observations over the South China Sea from March 2018 to February 2019. The annual total high cloud amount is analyzed and compared between CALIOP and ERA-Interim at day and night, and the monthly comparison between the two products is also conducted. The results show that the distributions of high cloudiness in CALIPSO and ECMWF are in fairly good agreement over the specific areas both day and night. The correlation coefficient between the two products is 0.72 at day, 0.71 at night. There are some differences between the two in annual total high cloud amount. The high cloud amount from ECMWF, which is 54.2%, is 8.8% lower than that from CALIPSO (63%) at day, and 14.9% at night, 57.4%, 72.3%, respectively
A new empirical formula is established to retrieve Total Precipitable Water(TPW) over South China Sea by using multichannel infrared data of Advanced Geostationary Radiation Imager(AGRI). The new formula has a better result compared with other split-window statistical retrieval technique. The preliminary verification results show that the retrieval results is good correlated with AIRS L2 V6 TPW products with root mean square error of 0.6 cm and with mean relative error of 4.7%. Finally, 227 sets of bank-based sounding data are used to verify the retrieval results for the whole year from March 2018 to April 2019. The determination coefficient is 0.7063 and the root mean square error is 0.63 cm. The results show that the proposed statistical retrieval formula is suitable for multi-channel infrared data of FY-4A/AGRI to retrieve the TPW over the South China Sea.
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