Las catástrofes naturales: Oscilación Austral
Walker y Bliss denominaron en, 1932, Oscilación Austral (Southern Oscillation) a un hecho climático de escala planetaria, caracterizado, entre otros rasgos, por el balance de la diferencia de presión atmosférica entre los océanos Índico y Pacífico; así pues, escogieron, como referencia definitoria, la alternación del campo de presión, subrayando, al mismo tiempo, la extraordinaria complejidad del fenómeno. Éste fue detectado, la década precedente, cuando Sir Gilbert Walker (1924), a la sazón director del servicio meteorológico inglés de la India, que intentaba prever la fecha de comienzo y la intensidad del monzón indio de verano, al correlacionar datos barométricos, observó que una variación significativa de presión en el Pacífico se correspondía con otro de signo opuesto en el Índico.
Para cuantificar esa relación, el propio Walker propuso el llamado el llamado Índice de la Oscilación Sur (SOI), que muestra la diferencia de presión atmosférica, normalizada a nivel de mar, entre Tahití y Darwin (Territorio del Norte, Australia); el Índice resulta positivo cuando la diferencia entre ambos registros excede el valor normal, y negativo si inferior a éste.
El Ciclo de la Oscilación Austral incluye dos episodios contrarios, y , también, de entidad y repercusiones bien diferentes. En efecto, la fase positiva, es decir, el episodio frío, conocido también por “La Niña”, “Anti-Niño” o “Contra-Niño”, puede considerarse, simplificando, como una situación de normalidad prolongada y reforzada, sin sucesos meteorológicos excepcionales excepcionales, aunque se acentúen algunos de ellos. Todo lo contrario ocurre con una fase negativa acusada, episodio cálido fuerte de ENSO intenso (como los de 1982-3 y 1997-98), con aguaceros torrenciales, riadas y diluvios en el desierto chileno-peruano, así como, mediante las llamadas teleconexiones, sucesos anómalos o infrecuentes a miles de kilómetros de distancia (diluvios, sequías, grandes brotes de tornados o mayor incidencia de ciclones tropicales, entre otros).
Información relacionada con Catástrofes naturales: Oscilación Austral:
- Catástrofes naturales y obras hidráulicas
- Catátrofes naturales: la sequía
- Catástrofes naturales: sequías
- Catástrofes naturales: Tornados
- Catástrofes naturales: El Niño
- Catástrofes naturales: Enso o Enos
- Catástrofes naturales: ciclones tropicales
- Gota fría
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