Comparison of Rainrate Between Raindrop Spectra and Rain Gauge Observations of the South China Precipitation Validation Station of Fengyun Meteorological Satellite
WU Qiong
WANG Gang
HAN Bowei
DONG Lixin
SHANG Jian
CHEN Lin
Abstract：Data from four two-dimensional raindrop spectrum at the Fengyun Satellite South China Precipitation Validation Station,along with co-located minute rain gauge data from Apirl to May 2024,were used.The consistency of precipitation observations between the two instruments was analyzed by comparing cumulative rainfall and instantaneous rain rates.The results indicate that at three of the four stations,the cumulative rainfall from the disdrometer exceeded that from the rain gauge by 10%to 13%.At a certain station,the disdrometer's cumulative rainfall was 0.5%lower.The correlation coefficient for cumulative rainfall was high,with an average above 0.99.When comparing instantaneous rain rate,applying a cubic spline interpolation to the rain gauge data significantly reduced the bias and mean absolute error between the the two instruments.This was particularly effective for weak precipitation(<10 mm·h-1)with discontinuous observations,where the correlation coefficient can be increased from 0.37 to approximately 0.8.This indicates that the interpolation method is reasonable and feasible for generating high-temporal-resolution instantaneous precipitation rate datasets from conventional rain gauge.The evaluation demonstrated good consistency between the two-dimensional raindrop spectrum and the rain gauge,suggesting these datasets can support the ground validation and algorithm improvement of Fengyun satellite precipitation retrieval products.
Keywords：raindrop spectrumrain gaugecumulative rainfallinstantaneous rain rateground validation
Publication Date：2025-12-31
Online Publishing Date：2026-01-12(First online date of this platform, not the publication date of the document)
Pages：9( 758-766 )