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Climatic variability in the vicinity of Wallis, Futuna, and Samoa islands (13 degrees-15 degrees S, 180 degrees-170 degrees W) 5
Alory, G; Delcroix, T.
h-lean conditions, seasonal, and ENSO-related (El Nine Southern Oscillation) variability in the vicinity of Wallis, Futuna, and Samoa islands (13 degrees-15 degrees S, 180 degrees-170 degrees W) over the 1973-1995 period are analysed for wind pseudostress, satellite-derived and in situ precipitation, sea surface temperature (SST) and salinity (SSS), sea level, and 0-450 m temperature and geostrophic current. The mean local conditions reflect the presence of the large scale features such as the western Pacific warm pool, the South Pacific Convergence Zone (SPCZ), and the South Pacific anticyclonic gyre. The seasonal changes are closely related to the meridional migrations of the SPCZ, which passes twice a year over the region of study. During the warm phase...
Tipo: Text Palavras-chave: Wallis et Futuna; Samoa; El Niño Oscillation Australe; Variabilité climatique; Wallis and Futuna; Samoa; El Nino Southern Oscillation; Climatic variability.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00325/43608/43913.pdf
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ENSO signals in the vicinity of New Caledonia, South Western Pacific 5
Delcroix, T; Lenormand, O.
Data collected in an area enclosing New Caledonia are analysed both for the open ocean (17 degrees S-27 degrees S, 169 degrees E-170 degrees E; 1972-1992) and for one point in its lagoon (1967-1993), in order to improve our knowledge of the regional environment, with emphasis on seasonal and interannual (i.e. ENSO) variability. Long-term means and seasonal changes in surface wind, sea-surface temperature and salinity, and 0-400 m temperature, salinity and zonal geostrophic current are first described to Set the context. Through comparisons with the Southern Oscillation Index (SOI), it is demonstrated that there are signals in these parameters that are connected with ENSO. During the warm phase of ENSO (SOI < 0, El Nino), we observed saltier-than-average...
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Ano: 1997 URL: http://archimer.ifremer.fr/doc/00093/20410/18077.pdf
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Interpretation of kelvin rossby waves in the equatorial pacific from model-geosat data intercomparison during the 1986-1987 el-nino 5
Dupenhoat, Y; Delcroix, T; Picaut, J.
Analysis of Geosat sea level data over the period November 1986-November 1987 has evidenced long, low-frequency equatorial wave propagations over most of the equatorial Pacific basin (Delcroix et al.,1991). The succession of downwelling Kelvin, upwelling Kelvin, and upwelling Rossby waves has raised a series of questions. Is the observed upwelling Rossby wave due to a reflection process on the eastern boundary, or due to wind forcing near the equator? Why is there no evidence of a reflection of the downwelling Kelvin wave? Is this wave sequence a feature of the 1986-1987 El Nino phenomenon or is it to be found in the mean seasonal cycle? We used a linear model forced by the FSU wind stress to study these questions. The results, during the period November...
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Ano: 1992 URL: http://archimer.ifremer.fr/doc/00101/21180/18797.pdf
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