Comparative Study on Dual Parameters of Snow Cover Based on the SSG-2 Snow Water Equivalent Detection System
Abstract
In 2024, the first SSG-2 Snow Water Equivalent Detection System in China was deployed in the outdoor experimental site for ice and snow in Jiamusi. Combined with automatic snow depth gauges and AMSR2 remote sensing products, it enabled the comparison of “dual true value” observational data during the snow accumulation period. This paper systematically evaluates the SSG-2 Snow Water Equivalent Detection System in terms of operational stability, data integrity, and data comparability. The results indicate that the overall accuracy of the SSG-2 system significantly outperforms that of the HY-SD01 and DSJ1 instruments at the same site. The true values of snow water equivalent obtained by the SSG-2 system exhibit a high degree of linear correlation with the remote sensing retrievals from AMSR2, with a high degree of synchronization in peak values, phases, and patterns of change, enabling rapid proportional calibration of satellite products. This study is the first to achieve refined validation of remote sensing retrievals using automatically obtained true value data for snow water equivalent. Subsequent research should utilize multi-year, multi-site data to validate its seasonal stability and regional applicability.
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