苏州科技大学学报（自然科学版）2026，Vol.43Issue(2)：36-42,7.DOI:10.12084/j.issn.2096-3289.2026.02.005
基于SMAP-R极化反射测量数据监测青藏高原地表冻融状态
Monitoring freeze-thaw states of the Qinghai Xizang(Tibetan)Plateau based on SMAP-R polarimetric observation data
摘要
Abstract
Spaceborne Global Navigation Satellite System Reflectometry(GNSS-R)is an emerging microwave re-mote sensing technique that has demonstrated significant potential for surface freeze-thaw(F/T)detection.Follow-ing the failure of its active radar instrument,the Soil Moisture Active and Passive(SMAP)satellite was reconfigured to operate in GNSS-R mode,becoming the first spaceborne sensor capable of simultaneously receiving both horizon-tal and vertical polarized GPS L2C signals reflected from the earth's surface.In this study,based on over nine years of SMAP-Reflectometry(SMAP-R)polarimetric observation data,we constructed multiple characteristic indictors,including total power reflectivity,polarization ratio,and normalized third and fourth Stokes parameters,to evaluate the sensitivity to surface F/T states over the Qinghai Xizang(Tibetan)Plateau and the capability in capturing F/T tran-sition dates.The results indicate that different polarimetric parameters exhibit distinct response characteristics to sur-face F/T cycle,showing high temporal consistency with Land Surface Temperature(LST)variations.The total power reflectivity and the normalized fourth Stokes parameter demonstrate specifically the highest sensitivity to F/T state transition,highlighting their superior performance in polarimetric monitoring.This study validates the feasibility of multi-polarization GNSS-R for F/T monitoring in complex plateau environments and offers valuable guidance for the development of future remote sensing products.关键词
GNSS-R/SMAP/地表冻融/反射率/斯托克斯参数Key words
GNSS-R/SMAP/surface freeze-thaw/reflectivity/Stokes parameters分类
天文与地球科学引用本文复制引用
董州楠,檀波,陈岱,赵亮亮,茅乾峰,黄尧新..基于SMAP-R极化反射测量数据监测青藏高原地表冻融状态[J].苏州科技大学学报（自然科学版）,2026,43(2):36-42,7.基金项目
国家自然科学基金项目(42204014) （42204014）
江苏省研究生实践创新计划项目(SJCX24_1884) （SJCX24_1884）
