海洋气象学报2024，Vol.44Issue(4)：46-53,8.DOI:10.19513/j.cnki.hyqxxb.20240515001
中法海洋卫星微波散射计后向散射测量误差分析
Analysis of backscattering measurement error of CSCAT
摘要
Abstract
The CFOSAT(China-France Oceanography SATellite)SCATterometer(CSCAT)adopts a pioneering fan-beam rotary scanning system to provide averaged backscattering coefficient of different combinations of various incidence angles and azimuth angles,obtaining high-quality retrieval information of ocean surface wind field.Despite the innovative system design and scanning mode,certain inaccuracies remain in measuring backscattering coefficient,especially under large incidence angles and low wind speed conditions.Then the Kp value,representing the normalized standard deviation,reflects the variation of measurement error with wind speed conditions and incidence angles.The NWP(numerical weather prediction)Ocean Calibration(NOC)method is applied during the processing of L1B-L2A data to effectively improve the measurement accuracy.The K of slices in L1B data indicates that the accuracy is better in the condition of about 40° incidence angle and medium wind speed.The error analysis of wind vector cells(WVCs)in L2A data shows that the measurement error is relatively large at low wind speed.Additionally,a consistent estimate of geophysical noise is obtained through recalibration data,and the geophysical noise accounts for 20％-30％after excluding the very low wind speed measurement.关键词
中法海洋卫星(CFOSAT)微波散射计(CSCAT)/海洋定标/测量误差/传递误差/地球物理噪声Key words
CFOSAT SCATterometer(CSCAT)/NWP Ocean Calibration(NOC)/measurement error/transmission error/geophysical noise分类
海洋科学引用本文复制引用
于淼淼,朱迪,董晓龙,林文明,马剑英,郎姝燕..中法海洋卫星微波散射计后向散射测量误差分析[J].海洋气象学报,2024,44(4):46-53,8.基金项目
国家重点研发计划项目(2021YFC2803300,2021YFC2803305) （2021YFC2803300,2021YFC2803305）
