A Physically-Based Two-Scale Ocean Surface Emissivity Model Tuned to WindSat and SSM/I Polarimetric Brightness Temperatures

2021 ◽  
pp. 1-1
Author(s):  
Sang-Moo Lee ◽  
Albin J. Gasiewski
Keyword(s):  
Ocean Surface ◽  
Surface Emissivity ◽  
Brightness Temperatures ◽  
Physically Based ◽  
Emissivity Model

scholarly journals A new description of small-scale and large-scale roughness in the fast ocean surface emissivity model

2020 ◽  
Author(s):  
Sang-Moo Lee ◽  
Byung-Ju Sohn
Keyword(s):  
Large Scale ◽  
Incidence Angle ◽  
Ocean Surface ◽  
Small Scale ◽  
Surface Emissivity ◽  
Fresnel Reflection ◽  
Physically Based ◽  
Emissivity Model ◽  
Reflection Theory ◽  
Scale Roughness

AbstractWidely used FAST Microwave Ocean Surface Emissivity Model (FASTEM) does not include the interaction between small-scale and large-scale roughness, which seems to induce errors in the ocean surface emissivity estimation. In this study, we attempt to develop a new model that might be included in the FASTEM-like model. In the developed model, the large-scale roughness is expressed as a function of the local incidence angle (LIA) within the context of Fresnel reflection theory, incorporating the interactions between the small-scale and large-scale roughness into the fast ocean surface emissivity model, as done in the two-scale approach. With the new expression of the large-scale roughness, we also provide a more physically-based form of the equation for the fast ocean surface emissivity calculation that includes the small-scale scattering over a geometrically rough surface. In addition, an algorithm for estimating two-scale roughness from the measured or modeled polarized emissivities in conjunction with the proposed fast ocean surface emissivity equation is provided. The results demonstrate that the interactions between two-scale roughness should be considered in order to estimate accurate two-scale roughness influences on the ocean surface emissivity.

Development of an ocean surface emissivity model for wide swath imaging of wind speed to hurricane force

2007 ◽  
Author(s):  
Salem F. El-Nimri ◽  
James W. Johnson ◽  
W. Linwood Jones ◽  
Eric W. Uhlhorn
Keyword(s):  
Wind Speed ◽  
Ocean Surface ◽  
Surface Emissivity ◽  
Emissivity Model ◽  
Wide Swath

An Improved C-Band Ocean Surface Emissivity Model at Hurricane-Force Wind Speeds Over a Wide Range of Earth Incidence Angles

2010 ◽  
Vol 7 (4) ◽  
pp. 641-645 ◽  
Author(s):  
Salem Fawwaz El-Nimri ◽  
W. Linwood Jones ◽  
Eric Uhlhorn ◽  
Christopher Ruf ◽  
James Johnson ◽  
...  
Keyword(s):  
Ocean Surface ◽  
Surface Emissivity ◽  
Wind Speeds ◽  
Wide Range ◽  
Emissivity Model

scholarly journals Comparison of the Infrared Surface Emissivity Model (ISEM) with a Physical Emissivity Model

2010 ◽  
Vol 27 (2) ◽  
pp. 345-352 ◽  
Author(s):  
Sungwook Hong ◽  
Inchul Shin ◽  
Mi-Lim Ou
Keyword(s):  
Refractive Index ◽  
Roughness Parameter ◽  
Satellite Observation ◽  
Sea Surface ◽  
Northwestern Pacific ◽  
Surface Emissivity ◽  
Infrared Wavelength ◽  
Clear Sky ◽  
Infrared Spectral ◽  
Emissivity Model

Abstract Accurate models of surface emissivity are important for interpreting satellite radiance observations. Surface emissivity depends on the satellite zenith angle, roughness, polarization, and refractive index of the surface. The effects of the roughness parameter on emissivity have not been studied thoroughly. By using an infrared geostationary satellite observation and a physical model based on the radiative transfer equation, the forward emissivity model and physical emissivity model are validated in the northwestern Pacific Ocean. First, the unpolarized emissivity at a given view angle and a wavelength of 10.8 μm in the thermal infrared spectral region is decomposed for the clear sky. The refractive index of the sea surface is quantitatively retrieved using the inversion of Fresnel equations. The refractive index of the sea surface derived from the physical emissivity exhibits a reasonable range within the infrared wavelength. The result of this investigation can be applied to the land emissivity model, which has not been studied thoroughly.

Sign in / Sign up

Export Citation Format

Share Document