Correlação entre medições do satélite MSG nos canais 5 e 6 e o teor de umidade do ar obtido pelo modelo BRAMS.

Abstract

This work had the objective of identifying the relationship between MSG satellite data from channels 5 and 6 with precipitable water, relative humidity and the difference between the air temperature and dew point temperature outputs from BRAMS model, in a tentative of associating atmospheric remote sensing and numerical modeling. For this, three base-images were obtained: 1) 29-09-2012, 12:00 UTC ranging between 21°S and 27ºS; 2) 29-09-2012, 18:00 UTC ranging between 23°S and 27°S, and finally 3) 30-09-2012, 00:00 UTC, ranging between 18°S and 24°S. The model was feeded with NCEP/NCAR Reanalysis data, using the same spatial resolution as the satellite data (4 km in a 6-hour time-step). The results have shown that the slight small (large) differences between MSG channel 5 and 6 data are associated to high (low) atmospheric water vapour content. A 95-99% statistical significance level was obtained throughout the obtained correlations. The MSG satellite data from channels 5 and 6 alongside the BRAMS simulations have proven to be an effective technique in the study of atmospheric humidity.