摘要
利用2012年黑河中游HiWATER实验区戈壁和大满超级站的土壤水分和温度廓线数据,基于L-MEB微波辐射传输模型,分析了L波段微波穿透深度随土壤水分的变化。在此基础上,分析了不同深度土壤水分和温度作为L-MEB模型输入,对L波段微波发射率和亮度温度的影响。研究结果表明：L波段微波穿透深度随土壤水分、温度的变化,呈现明显的差异,在本研究区L波段微波穿透深度在4~22cm之间;在土壤水分较高的超级站,计算的L波段亮度温度与0~4cm土壤层的亮度温度更为接近,而在土壤水分较低的戈壁站,计算的L波段亮度温度与0~40cm土壤层的亮度温度更为接近。因此,在利用L波段微波数据反演土壤水分时,应考虑穿透深度的影响,以提高反演精度。
Based on L-MEB（the L-band Microwave Emission of the Biosphere）model and observations of soil moisture and soil temperature profiles of two stations located at HiWATER experimental area in midstream of the Heihe River Basin in 2012,we analyzed the influence of soil moisture variation on L-band microwave penetration depth.Also,we analyzed further the influence of soil moisture and temperature with different depths as input of L-MEB on calculations of surface emissivity and brightness temperature.It is shown that penetration depth ranges from 4to 30 cm in these two sites and obviously changes with soil moisture profile.The calculated brightness temperatures are closer to results of 0~4cm in Super Station but are closer to results of 0~40cm in Gobi Station.Therefore,it should be taken much attention to the impact of penetration depth on retrieving soil moisture based on L-band microwave brightness temperature.
出处
《遥感技术与应用》
CSCD
北大核心
2016年第3期580-589,共10页
Remote Sensing Technology and Application
基金
国家自然科学基金项目(91325106)
中国科学院"百人计划"项目(29Y127D01)资助
关键词
土壤水分
L-MEB
微波遥感
穿透深度
干旱区
Soil moisture
L-MEB
Microwave remote sensing
Penetration depth
Arid region
