Interferometric measurements of sea surface temperature and emissivity

A new multispectral method to derive sea surface emissivity and temperature by using interferometer measurements of the near surface upwelling radiation in the infrared window region is presented. As reflected sky radiation adds substantial spectral variability to the otherwise spectrally smooth surface radiation, an appropriate estimate of surface emissivity allows the measured upwelling radiation to be corrected for the reflected sky component. The remaining radiation, together with the estimated surface emissivity, yields an estimate of the sea surface temperature. Measurements from an ocean pier in the Baltic Sea in October 1995 indicate an accuracy of about 0.1 K for the sea surface temperature thus derived. A strong sea surface skin effect of about 0.6 K is found in that particular case.

[1]  W. Alpers,et al.  Variation of the Microwave Brightness Temperature of Sea Surfaces Covered with Mineral And Monomolecular Oil Films , 1983, IEEE Transactions on Geoscience and Remote Sensing.

[2]  K. Masuda,et al.  Emissivity of pure and sea waters for the model sea surface in the infrared window regions , 1988 .

[3]  William J. Emery,et al.  On the bulk‐skin temperature difference and its impact on satellite remote sensing of sea surface temperature , 1990 .

[4]  Jin Wu,et al.  On the cool skin of the ocean , 1985 .

[5]  J. J. Simpson,et al.  The temperature difference across the cool skin of the ocean , 1981 .

[6]  L. Hasse The sea surface temperature deviation and the heat flow at the sea-air interface , 1971 .

[7]  D. Friedman,et al.  Infrared Characteristics of Ocean Water (1.5-15 micro). , 1969, Applied optics.

[8]  E. F. Bradley,et al.  Simultaneous observations of sea surface temperature in the western equatorial Pacific Ocean by bulk, radiative and satellite methods , 1991 .

[9]  M Sidran,et al.  Broadband reflectance and emissivity of specular and rough water surfaces. , 1981, Applied optics.

[10]  P. M. Saunders,et al.  The Temperature at the Ocean-Air Interface , 1967 .

[11]  N. L. Jarvis THE EFFECT OF MONOMOLECULAR FILMS ON SURFACE TEMPERATURE AND CONVECTIVE MOTION AT THE WATER/AIR INTERFACE , 1962 .

[12]  A. Savitzky,et al.  Smoothing and Differentiation of Data by Simplified Least Squares Procedures. , 1964 .

[13]  I. J. Barton,et al.  Validation of the ATSR in Australian Waters , 1995 .

[14]  Hartmut Grassl,et al.  The dependence of the measured cool skin of the ocean on wind stress and total heat flux , 1976 .

[15]  H. B. Howell,et al.  Radiometric calibration of IR Fourier transform spectrometers: solution to a problem with the High-Resolution Interferometer Sounder. , 1988, Applied optics.

[16]  Craig Donlon,et al.  Observations of the oceanic thermal skin in the Atlantic Ocean , 1997 .

[17]  W. Mcleish,et al.  A radiometric system for airborne measurement of the total heat flow from the sea. , 1970, Applied optics.

[18]  William L. Smith,et al.  Sounding the Skin of Water: Sensing Air–Water Interface Temperature Gradients with Interferometry , 1995 .

[19]  Ian S. Robinson,et al.  Review Article. The sea surface thermal boundary layer and its relevance to the measurement of sea surface temperature by airborne and spaceborne radiometers , 1984 .

[20]  Heinrich Hühnerfuss,et al.  The effect of monomolecular surface films on the microwave brightness temperature of the sea surface , 1982 .

[21]  Kristina B. Katsaros,et al.  The aqueous thermal boundary layer , 1980 .

[22]  William L. Smith,et al.  Observations of the infrared radiative properties of the ocean-implications for the measurement of sea surface temperature via satellite remote sensing , 1996 .

[23]  John Turner,et al.  An Evaluation of a Self-Calibrating Infrared Radiometer for Measuring Sea Surface Temperature , 1995 .