MODES OF INTERANNUAL VARIABILITY OF OCEANIC EVAPORATION OBSERVED FROM GSSTF2
Variations of the oceanic evaporation are examined using Goddard Satellite Surface Turbulence Flux version 2 (GSSTF2) data. An Empirical Orthogonal Function (EOF) analysis shows that the first non-seasonal EOF, which explains 9.2% of the variance, is characterized by large changes in the subtropical...
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| Autores principales: | , |
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| Lenguaje: | English |
| Publicado: |
Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción
2004
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| Acceso en línea: | http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200021 |
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| Sumario: | Variations of the oceanic evaporation are examined using Goddard Satellite Surface Turbulence Flux version 2 (GSSTF2) data. An Empirical Orthogonal Function (EOF) analysis shows that the first non-seasonal EOF, which explains 9.2% of the variance, is characterized by large changes in the subtropical oceanic dry regions, accompanied by small negative changes in the equatorial warm pool and the eastern equatorial Pacific. The time series shows an increasing trend with decadal time scale that started around 1990. This pattern is interpreted as an enhancement of the Hadley and Walker circulation. The second EOF, explaining 5.7% of the variance, is characterized by an equatorial east-west and a mid ocean north-south dipole in the Pacific. The second pattern is similar to the First EOF pattern of non-seasonal oceanic precipitation found in earlier studies, and is related to the El Nino Southern Oscillation phenomena. It is correlated with a Southern Oscillation Index at 0.74, which is significant at the 95% level. Over the region 65(0)S 65(0)N, oceanic evaporation, surface wind speed and air-sea humidity difference from GSSTF2 shows increases of 17%, 6% and 11% over the period July 1988-December 2000. Most of this linear trend is associated with a decadal variation of the atmospheric circulation and points to the need for quantifying interannual variations in long-term climate changes studies in the global hydrologic cycle |
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