海洋气象学报2024，Vol.44Issue(4)：76-90,15.DOI:10.19513/j.cnki.hyqxxb.20240109001
中法海洋卫星微波散射计海冰区后向散射系数时空变化特征
Spatial and temporal characteristics of CSCAT backscattering coefficient over sea ice zone
摘要
Abstract
Previous studies on the sea ice remote sensing based on microwave scatterometers mainly focus on distinguishing sea ice from sea water,and in turn,exploring the coverage of sea ice.The scatterometer onboard China-France Oceanography SATellite(CFOSAT),namely CSCAT,uses rotary fan beams to observe the earth surface,such that its multi-incidence and multi-azimuth observation geometry provides new opportunities for sea ice monitoring.In this study,the CSCAT backscattering coefficient data are firstly collocated with the sea ice concentration(SIC)data from European Organisation for the Exploitation of Meteorological Satellites(EUMETSAT),and then the seasonal variations of the CSCAT backscattering coefficient under different SIC conditions in the Arctic and Antarctic are analyzed.Consequently,the spatial and temporal characteristics of the CSCAT backscattering coefficient over the sea ice zones are derived,which provide a foundation for developing a sea ice geophysical model function(GMF).The results show that the CSCAT backscattering coefficient increases with SIC.Under low SIC condition,the CSCAT backscattering coefficient shows good consistency in the Arctic and Antarctic,but there is an obvious modulation by wind speed,whose effect weakens as the SIC increases.In summary,the study provides relevant hints for the SIC retrieval using the scatterometer with fan-beam rotary scanning system.关键词
中法海洋卫星(CFOSAT)/散射计/海冰密集度(SIC)/后向散射系数/时空分布特征Key words
China-France Oceanography SATellite(CFOSAT)/scatterometer/sea ice concentration(SIC)/backscattering coefficient/spatial and temporal characteristics分类
海洋科学引用本文复制引用
羊丽青,林文明..中法海洋卫星微波散射计海冰区后向散射系数时空变化特征[J].海洋气象学报,2024,44(4):76-90,15.基金项目
国家重点研发计划项目(2022YFC3104900,2022YFC3104902) （2022YFC3104900,2022YFC3104902）
