Validation of FY-3D/VASS Retrieved Temperature and Humidity Profiles in Sichuan Basin and Western Sichuan Plateau
FY-3D Vertical Atmospheric Sounding System(VASS)temperature and humidity profile prod-ucts are evaluated using radiosonde observations and ERA5 reanalysis dataset in Sichuan Basin and West-ern Sichuan Plateau.The results show that relative to ERA5 data,the average bias of FY-3D/VASS tem-perature in different seasons is from-0.631 to 0.500℃ and from-2.230 to-1.234℃ respectively,and the root mean square error is from 2.117 to 3.222℃ and from 3.077 to 3.460℃ in the basin and the plat-eau area respectively.Vertically,the accuracy of temperature is low at 800-700 hPa in the basin area and gradually decreases as the height decreases in the plateau area.The average bias of FY-3D/VASS specific humidity relative to ERA5 data is generally negative,while the average bias in different seasons is from-0.775 to-0.525 g·kg-1and from-1.096 to-0.347 g·kg-1respectively,and the root mean square error is from 1.251 to 2.367 g·kg-1and from 0.696 to 1.991 g·kg-1at the basin and the plateau area re-spectively.The accuracy of specific humidity is relatively low at 700-600 hPa.In consideration of the small diurnal difference in the accuracy of FY-3D/VASS temperature and humidity,the average biases of the two groups of evaluations are properly added.As a result,the average biases of FY-3D/VASS temper-ature and specific humidity can be indirectly obtained based on the radiosonde observations.Relative to ra-diosonde observations,the average bias of FY-3D/VASS temperature in the basin area is relatively small and the average bias in the plateau area is lower by about 2.440℃.The average bias of FY-3D/VASS spe-cific humidity in the basin and plateau area is lower by about 0.612 g·kg-1.The above-mentioned results are significant for improving the weather and climate application ability of FY-3D/VASS temperature and humidity profile products in Sichuan Basin and Western Sichuan Plateau.
FY-3D/VASStemperature and humidity profileSichuan BasinWestern Sichuan Plateau
万方数据
维普
