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In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
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An accelerating particle experiences a force equal to the mass multiplied by the acceleration in an inertial frame of reference. Consider a particle in a non-inertial frame of reference, such as a sliding ball on a rotating table. The acceleration of the ball in this rotating reference frame is different than in the intertial frame, which modifies its equation of motion. The fictitious forces acting additionally on a rotating frame of reference alter Newton's Second Law expression.
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La Oscilación Multidecal Atlántica sin un papel para la circulación oceánica

Amy Clement1, Katinka Bellomo2, Lisa N Murphy2

  • 1Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, USA. aclement@rsmas.miami.edu.

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PubMed
Resumen

La Oscilación Multidecal Atlántica (AMO) es impulsada por la circulación atmosférica, no por las corrientes oceánicas como la Circulación Meridional Atlántica (AMOC). Los modelos climáticos muestran características AMO incluso cuando el transporte de calor oceánico está fijo, lo que sugiere una nueva comprensión de este modo de variabilidad climática importante.

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Área de la Ciencia:

  • Ciencias del clima
  • La oceanografía
  • Ciencias atmosféricas

Sus antecedentes:

  • La Oscilación Multidecal Atlántica (AMO) es un patrón climático significativo que afecta a la sociedad.
  • Las teorías predominantes atribuyen el conductor de AMO a la circulación oceánica, en particular la Circulación Meridional Atlántica (AMOC).

Objetivo del estudio:

  • Investigar las causas principales de la Oscilación Multidecadal del Atlántico (AMO).
  • Desafiar la visión establecida de la AMOC como la causa de la AMO.

Principales métodos:

  • Modelos climáticos utilizados con el transporte de calor oceánico prescrito para aislar la influencia atmosférica.
  • Se evaluó el impacto del acoplamiento interactivo océano-atmósfera en las características de la AMO.

Principales resultados:

  • Los modelos climáticos reproducen con éxito las características clave de AMO con el transporte de calor oceánico fijo.
  • El acoplamiento interactivo océano-atmósfera no alteró sustancialmente las características de AMO en los modelos actuales.

Conclusiones:

  • El AMO parece ser una respuesta al forzamiento estocástico de la circulación atmosférica de latitud media.
  • Los cambios en la circulación oceánica, incluidos los cambios en el COAM, son probablemente consecuencias más que causas de la OAM.
  • El acoplamiento térmico en los trópicos juega un papel en el fenómeno AMO.