空间科学学报2026，Vol.46Issue(3)：718-725,8.DOI:10.11728/cjss2026.03.2025-0076
基于卫星遥感的海浪斜率方差验证与差异原因分析
Validation and Discrepancy Analysis of Sea Surface Mean Square Slope Measured by SWIM and CYGNSS
摘要
Abstract
The Mean Square Slope(MSS)of the sea surface is a key parameter for characterizing sea surface roughness in the field of marine microwave remote sensing,and it is of great significance for studying the air-sea coupling process and marine meteorological monitoring.This paper conducts a com-parative analysis of the MSS retrieved by the Surface Waves Investigation and Monitoring(SWIM)on the China-France Oceanography Satellite(CFOSAT)and the Cyclone Global Navigation Satellite Sys-tem(CYGNSS).SWIM retrieves the MSS by fitting the two-dimensional normalized radar backscatter cross-section under different incident angles and azimuth angles.CYGNSS obtains the MSS caused by local winds by subtracting a correction amount on the basis of preliminary observations.In this paper,after collocating the data from SWIM and CYGNSS in January 2023,a direct comparison has been made.It is found that the MSS derived from SWIM is higher than that retrieved by CYGNSS under low wind speeds,while when the wind speed exceeds approximately 7 m·s-1,the MSS derived from CYGNSS is higher than that given by SWIM.This is mainly attributed to the differences in the microwave bands of the two and the correction amount of the MSS generated by swell subtracted during the retrieval pro-cess of CYGNSS.After correcting the SWIM MSS using the Elfouhaily spectrum model,the bias be-tween the two is approximately 0.03,and the random root mean square error is 0.0323.This error is caused by the MSS generated by swell and the differences in the cutoff wavelength.The research results clarify the differences and error sources of the MSS retrieved by the two spaceborne sensors,providing an important reference for the calibration of MSS data and subsequent marine research and applications.关键词
海面斜率方差/微波遥感/中法海洋卫星/海浪波谱仪/旋风全球卫星导航系统Key words
Sea surface mean square slope/Microwave remote sensing/CFOSAT/Surface Waves Investigation and Monitoring(SWIM)/Cyclone Global Navigation Satellite System(CYGNSS)分类
海洋科学引用本文复制引用
郎姝燕,胡暐平,李秀仲,李雨阳,赵新华..基于卫星遥感的海浪斜率方差验证与差异原因分析[J].空间科学学报,2026,46(3):718-725,8.基金项目
国家自然科学基金重大项目(42192531)和山东省自然科学基金项目(ZR202102240074)共同资助 （42192531）
