Modeling sun glitter at L-band for sea surface salinity remote sensing with SMOS

被引:46
作者
Reul, Nicolas [1 ]
Tenerelli, Joseph
Chapron, Bertrand
Waldteufel, Philippe
机构
[1] IFREMER, Ctr Brest, Lab Oceanol Spatiale, F-29280 Plouzane, France
[2] CNRS, Serv Aeron, Inst Pierre & Simon Laplace, F-91371 Verrieres Le Buisson, France
来源
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING | 2007年 / 45卷 / 07期
关键词
microwave radiometry; ocean remote sensing; rough surface scattering; sea surface salinity (SSS); sun glitter;
D O I
10.1109/TGRS.2006.890421
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Since the sun is an extremely strong radiation source at L-band, accounting for sun glint over the ocean, i.e., solar radiation reflected by the sea surface toward downward-looking radiometers, raises a significant challenge for the remote sensing of sea surface salinity. This paper describes a dedicated physical model for sun glint at L-band frequencies and provides quantitative and qualitative estimates of the sun glint contamination impinging the antenna of the Microwave Imaging Radiometer with Aperture Synthesis interferometer onboard the future European Space Agency's Soil Moisture and Ocean Salinity (SMOS) mission, The sun brightness temperature expected during the mission period is first estimated from past solar flux data with an expected range of 1.1 X 10(5) K to about 9 x 10(5) K. Numerical simulations of the predicted illumination of the SMOS antenna by solar radiation scattered by the rough sea surface are then performed at,key dates of the seasonal cycle using different asymptotic scattering models and several representative surface conditions. Although the center of the sun's glitter pattern will never be located within the useful part of SMOS' synthesized field of view, the expected contamination due to roughness scattering will range between 0 K and about 500 K, depending on the target position, the season period, the roughness state at the target, and the level of solar,activity at the time of measurements. In particular, we find the sun glint contamination to be more intense when SMOS will probe ocean surfaces in the Southern Hemisphere, reaching maxima in descending passes with highest values expected at dates around winter solstices.
引用
收藏
页码:2073 / 2087
页数:15
相关论文
共 27 条
[21]   LIMITS TO THE ACCURACY OF THE 10.7 CM FLUX [J].
TAPPING, KF ;
CHARROIS, DP .
SOLAR PHYSICS, 1994, 150 (1-2) :305-315
[22]   An improved geometrical optics model for bistatic GPS scattering from the ocean surface [J].
Thompson, DR ;
Elfouhaily, TM ;
Garrison, JL .
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 2005, 43 (12) :2810-2821
[23]   SMALL-SLOPE APPROXIMATION FOR ELECTROMAGNETIC-WAVE SCATTERING AT A ROUGH INTERFACE OF DIELECTRIC HALF-SPACES [J].
VORONOVICH, A .
WAVES IN RANDOM MEDIA, 1994, 4 (03) :337-367
[24]  
Voronovich A. G., 1985, Soviet Physics - JETP, V62, P65
[25]   Theoretical model for scattering of radar signals in Ku- and C-bands from a rough sea surface with breaking waves [J].
Voronovich, AG ;
Zavorotny, VU .
WAVES IN RANDOM MEDIA, 2001, 11 (03) :247-269
[26]   FORWARD SCATTERING OF MICROWAVE SOLAR-RADIATION FROM A WATER SURFACE [J].
WENTZ, FJ .
RADIO SCIENCE, 1978, 13 (01) :131-138
[27]   Error sources and feasibility for microwave remote sensing of ocean surface salinity [J].
Yueh, SH ;
West, R ;
Wilson, WJ ;
Li, FK ;
Njoku, EG ;
Rahmat-Samii, Y .
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 2001, 39 (05) :1049-1060