摘要
为了研究海面风场对海表盐度反演结果的影响,需要构建准确的海面风场影响下的海表亮温模型。将不同海面粗糙度模型计算的结果与Aquarius盐度计卫星产品中的海面粗糙度数据进行了比较,结果表明双尺度模型结合海面泡沫模型的计算结果与Aquarius卫星产品粗糙度数据一致性最好。基于此构建了海面风场影响下的海面亮温仿真模型以及双极化通道的盐度反演模型,研究了海面风场对L波段海面微波辐射特性的影响以及风场资料误差对盐度反演精度的影响。仿真结果表明,2m/s的风速误差对盐度反演结果的影响较大。在低温和大风速条件下达到1psu以上,尚不能满足目前盐度遥感的精度要求。20°的风向误差对在中小入射角条件下对盐度反演结果影响较小,对盐度遥感的月平均要求影响不大。
For studying the effect of sea surface wind on sea surface salinity retrieval, the reasonable forward model of brightness temperature simulation should be established.The calculated results of different main sea roughness models used in sea salinity retrieval at L-band are compared with the roughness data of A- quarius product.The result shows that the two scale - foam model agrees best with the Aquarius data.For- ward model of the brightness temperature simulation of wind-induced sea is built based on the flat sea model and the two scale - foam model.The effects of sea surface wind on seawater permittivity and the effects of sea surface wind error on salinity retrieval are investigated.The results show that 2 m/s wind ve- locity error has a great effect on the salinity retrieval and fails to reach the required precision when the sea surface temperature is low or the wind velocity is high.20°wind direction error has a weak effect on the sa- linity retrieval and reaches the monthly average precision requirement when the incident angle is not large,
出处
《遥感技术与应用》
CSCD
北大核心
2016年第6期1037-1044,共8页
Remote Sensing Technology and Application
基金
国家自然科学基金项目"基于GNSS信号极化特性的降雨强度反演及仿真技术研究"(41505016)
国家自然科学基金项目"星载海洋遥感微波辐射计辐射测量受电离层及对流层大气环境的影响研究"(41306187)
关键词
海表面盐度
海面粗糙度
海面风场
盐度反演
Sea surface salinity
Sea roughness
Sea surface wind
Salinity retrieval
