首页|A new scheme for retrieving ocean surface salinity from simulated multi-angular SMOS brightness temperature
A new scheme for retrieving ocean surface salinity from simulated multi-angular SMOS brightness temperature
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NETL
NSTL
万方数据
维普
The European Space Agency will launch the first salinity satellite for remotely sensing the global soil moisture and ocean salinity (SMOS) at a sun-synchronous orbit in 2009.One of the payloads on the satellite is a synthetic aperture microwave radiometer (MIRAS),which is an innovative instrument designed as a two-dimensional (2D) interferometer for acquiring brightness temperature (T_B) at L-band (1.4 GHz).MIRAS allows measuring T_B at a series of incidences for full polarizations.As the satellite travels,a given location within the 2D field of view is observed from different incidence angles.The authors develop a new scheme to retrieve the sea-surface salinity (SSS) from SMOS's T_B at multi-incidence angles in a pixel,utilizing the properties of emissivity changing with incidence angles.All measurements of a given Stokes parameter in a pixel are first fitted to incidence angles in three order polynomial,and then the smoothed data are used for retrieving the SSS.The procedure will remove the random noise in T_B greatly.Furthermore,the new method shows that the error in retrieved SSS is very sensitive to the system biases in the calibrated T_B of the sensor,but the error in the retrieval is also a system bias,which can be corrected by post-launch validation.Therefore,this method may also serve as a means to evaluate the calibration precision in T_B.
SMOSsalinity retrievalmuhi-incidence angle
WANG Zhen-zhan、YIN Xiao-bin
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Center for Space Science and Applied Research,CAS,Beijing 100190,China
NETL
NSTL
万方数据
维普
