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http://hdl.handle.net/10229/36176
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| Title: | Analise de disturbios ondulatorios de leste sobre o Oceano Atlantico equatorial sul
Analysis of wave disturbances from east over equatorial South Atlantic Oceanic |
| Authors: | Sin Chan Chou
Brahamananda Rao Vadlamudi
Nelson de Jesus Ferreira
Satyamurty Prakki
Mary Toshie Kayano
Ernesto dos Santos Caetano Neto |
| Keywords: | meteorologia
climatologia
Oceano Atlantico Equatorial Sul
disturbios equatoriais
meteorology
climatology
Atlantic Ocean
equatorial disturbance |
| Issue Date: | |
| Publisher: | Arquivo URLib de Teses e Dissertações do INPE |
| Abstract: | Analisa-se as caracteristicas ondulatorias basicas dos disturbios equatoriais de leste sobre o Oceano Atlantico Equatorial Sul, proximo a costa da America do Sul, durante o First GARP (Global Atmospheric Research Program) Global Experiment (FGGE). Foram utilizados dados do National Meteorological Center (NMC) e dados de radiacao de onda longa (ROL). Analises de diagramas tipo "Hovmoller" da componente meridional do vento revelam disturbios ondulatorios se propagando para oeste com velocidade de fase entre 10 a 12 m/s, periodo entre 5 a 6 dias, e comprimento de onda de 4800 km a 6200 km. Ha sinais de disturbios durante todo o ano. No outono ocorrem as ondas mais curtas, enquanto no inverno ocorrem as ondas mais longas. As analises mostram disturbios em ROL com periodos entre 10 a 30 e entre 30 a 60 dias. Os espectros de potencia da componente meridional do vento apresentam picos no intervalo de 3 a 5 dias em 5 S. Estes picos se destacam mais na estacoes de outono e inverno, em torno de 20 W e 25 W. Os espectros cruzados indicam ondas se propagando para oeste com a velocidade de 9m5 m/s e comprimento de onda de 3300 km durante o trimetre MAM, e velocidade de 15 m/s e comprimento de 5200 km durante o trimestre JJA.
Using the National Meteorological Center (NMC) daily data and Outgoing Longwave Radiation data (OLR), this study focus on the main features of wave disturbances over the Equatorial Atlantic Ocean, vicinity of South America, during the First GARP Global Experiment (FGGE). Hovmoller diagrams and spectrum analysis of the meridional component of wind at 850 hPa are used to estimate the time scale and the propagation features of wave disturbances. Analysis of Hovmoller diagrams reveal, throughout the year, the existence of waves propagating westward with a period of 5-6 days, phase speed of 10-12 m/s, and wavelength of about 4800-6200 km. During the southern autumn, the waves are relatively short while during the southern winter the waves are relatively long. Also during these seasons the amplitude of the waves are relatively larger than during the other seasons. These disturbances are only weakly observed in OLR data, while disturbances of 10-30 days and 30-60 days period were more evident. Power spectra of meridional wind component show peaks between 3-5 days over the Atlantic Ocean at 5°S. These peaks are more prominent during autumn and winter and at about 20°W and 25°W. Cross spectra indicate waves travelling westwards at speed of 9.5 m/s and wavelength of 3300 km during southern autumn, and at phase speed of 15 m/s and wavelength of about 5200 km during southern winter. . |
| URI: | http://hdl.handle.net/10229/36176 |
| Other Identifiers: | http://bibdigital.sid.inpe.br/rep-/sid.inpe.br/MTC-m13@80/2005/08.18.12.54
oai:sid.inpe.br:sid.inpe.br/MTC-m13@80/2005/08.18.12.54.56-0 |
| Appears in Collections: | Instituto Nacional de Pesquisas Espaciais - INPE
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