Modeling L-Band Brightness Temperature at Dome C in Antarctica and Comparison With SMOS Observations


2 electromagnetic models were used to simulate snow emission at L-band from in situ measurements of snow properties collected at Dome C in Antarctica. 2 different approaches were used: one primarily based on the radiative transfer theory and the opposite on the wave approach. The soil moisture ocean salinity (SMOS) satellite observations performed at 1.four GHz (twenty one cm) were used to check the validity of these models. Model results based on the wave approach were in good agreement with SMOS observations, notably for incidence angles lower than fifty five°. Comparisons counsel that the wave approach is a lot of appropriate to simulate brightness temperature at L-band than the transfer radiative theory, as a result of interference between the layers of the snowpack is healthier taken under consideration. The model based mostly on the wave approach was then used to analyze several L-band characteristics at Dome C. The emission e-folding depth, i.e., 67% of the signal, was estimated at 250 m, and ninety nine% of the signal emanated from the top 900 m. L-band brightness temperature is solely slightly littered with differences due to the season in surface temperature, confirming the high temporal stability of snow emission at low frequency. Sensitivity tests showed that sensible information of density variability in the snowpack is crucial for accurate simulations in L-band.

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