Dependence of sea surface emissivity on temperature-dependent refractive index

作者：Masuda K^*

来源：Quarterly Journal of the Royal Meteorological Society, 2008, 134(631): 541-545.

DOI：10.1002/qj.192

• sea surface temperature
• satellite
• radiation
• remote sensing

Theoretical calculations of emissivity difference, Delta epsilon, with changing of water temperature from 301 to 279 K are performed at 820 cm(-1) using the temperature-dependent refractive index of sea water recently proposed by Newman and co-workers. The results are compared with the calculations using the temperature-dependent refractive index presented in 1977 by Pinkley and co-workers. The difference in Delta epsilon between the two models is as small as similar to 0.0003 for emission angles less than 30 degrees. At larger emission angles, the discrepancy in Delta epsilon between the two models is notable. For example, Delta epsilon are similar to - 0.0055 and similar to - 0.0070 for the Newman and Pinkley models, respectively, at an emission angle of 55 degrees. This discrepancy is mainly caused by the fact that the temperature dependence of the imaginary part of the refractive index of the Pinkley model is similar to 1.5 times larger than that of the Newman model and the sea surface emissivity is significantly sensitive to the change of imaginary refractive index at this wavenumber. It is important that accurate values of the imaginary part of the refractive index be obtained.

• 出版日期2008-1
• 单位中国气象科学研究院