摘要
通过水池实验研究了L波段微波辐射和盐度的关系,并进行了盐度的反演计算。实验中,先向水池内加入天然海水,然后通过向水池中添加自来水的方式调节降低池内水体的盐度,使盐度从31.67逐步降低到27.48。在此期间,利用微波辐射计观测池内水体的L波段H极化和V极化辐射值以及S波段V极化辐射值,利用CTD观测池内水体的温度和盐度。L波段微波辐射值和根据辐射理论计算出的亮温值具有很好的线性关系。利用最大和最小的2个盐度下的微波辐射值和由辐射理论计算的亮温得到定标公式,将观测的辐射值换算为亮温。最后利用半解析的反演算法反演盐度。本次实验的反演最大误差为2.1,均方差为0.3。
Based on the experiment, the paper studies the relationship of microwave radiation at L band and seawater salinity, and the paper also studies the method to retrieval salinity. By pumping freshwater into the seawater pool, the salinity was reduced step by stop to get 7 different salinity observation points between 31. 67 to 27. 48. At each observation point, L and S band microwave radiometers were used to measure the dual-polarization radiation of the water in the pool and a CTD was deployed in the pool to record the temperature and salinity. The radiation at L band has a good linear relation with the bright temperature. Using the relation, which is calculated with results of only the maximal salinity point and the minimums salinity point, the bright temperature was calculated from the radiation value. The salinity at the all seven points was retrieved using a seimi-analytic algorithm. The errors of the retrieval salinity are between 0 and 2. 1, and the mean squared error is 0. 3.
出处
《海洋技术》
2006年第3期70-75,89,共7页
Ocean Technology
基金
国家高技术研究发展计划(863计划)"海水盐度航空遥感信息提取技术"(2002AA633130)资助
关键词
海水盐度
L
波段微波
反演算法
Ocean salinity
L Band microwave
retrieval algorithm
