Study of winds from 80 to 100km by meteorradar at Santa Maria (29,7°S;53,8°O) Region / Estudo dos ventos entre 80 e 100 km utilizando radar meteórico na região de Santa Maria (29,7°S; 53,8°O)

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

The present work deals with prevailing winds and atmospheric solar tides from 80 to 100 km, measured by SKiYMET meteor radar at Santa Maria (29,7°S; 53,8°W). This is the first detailed study using the Santa Maria SKiYMET data. The data period used for this analysis is the three years of observation 2005 to 2007. Monthly and annual analyses are made to investigate, respectively, the season and inter-annual variations of mean winds and atmospheric tides. The results for the mean wind were compared with the HWM-93 (Horizontal neutral wind model) and the results of atmospheric tides were compared with the GSWM-00 (Global Scale Wave Model). Divergences were found in these comparisons. Annual variability is found in the zonal component of the mean wind that it is different to that of the HWM-93 model. The zonal component of the diurnal tide amplitude presents annual variability while GSWM-00 shows semianual variability for both components. The vertical wavelength of the zonal component of the diurnal tide is about 27 km, much smaller than suggested by the model. It is the semidiurnal tide that shows most divergence from GSWM-00. There is seasonal and inter-annual variability in both components of the semidiurnal tide. And the behavior of the phase is evanescent during almost all of the year. It is also found that comparisons between the data from the three Brazilian meteor radars show latitudinal variations in the semidiurnal and diurnal tide.

ASSUNTO(S)

oscilações atmosféricas atmospheric tides meteor radar radar meteórico ventos médios/ atmospheric oscillations mean winds marés atmosféricas

ACESSO AO ARTIGO

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