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Movimiento vertical medio a largo plazo sobre el Pacífico tropical: mediciones de radar Doppler de perfilado de
Science (New York, N.Y.)
|December 20, 1991
Resumen
El movimiento vertical de la atmósfera tropical pasa de abajo hacia arriba en la troposfera superior y la estratosfera inferior. Las nubes cirrus cerca de la tropopausa influyen significativamente en estos movimientos, impactando el intercambio de masa entre la troposfera y la estratosfera.
Área de la Ciencia:
- Ciencias de la atmósfera Ciencias atmosféricas.
- Meteorología Tropical.
- Dinámica de la atmósfera Dinámica de la atmósfera
Sus antecedentes:
- El movimiento vertical en la atmósfera tropical es crucial para los patrones climáticos y el clima.
- Comprender la transición entre la circulación troposférica y la estratosférica es clave para el modelado climático.
- Los estudios anteriores se han centrado en condiciones específicas, lo que ha requerido observaciones más amplias.
Objetivo del estudio:
- Para investigar los movimientos verticales medios a largo plazo en la atmósfera tropical.
- Para analizar la influencia de las condiciones atmosféricas, incluyendo El Niño y las nubes cirrus, en el movimiento vertical.
- Para evaluar las implicaciones para el intercambio de masa troposfera-estratosfera.
Principales métodos:
- Utilizó un radar Doppler de perfil de viento de muy alta frecuencia (VHF) para mediciones en la Isla de Navidad.
- Se analizaron datos de movimiento vertical promedio a largo plazo.
- Comparó las observaciones durante los períodos de El Niño y no El Niño con los datos de Pohnpei.
Principales resultados:
- Se observó una transición del movimiento descendente en la troposfera libre al movimiento ascendente en la troposfera superior y la estratosfera inferior.
- Los movimientos libres de la troposfera se alinean con los equilibrios de calentamiento y refrigeración adiabáticos y diabáticos en el aire despejado.
- Las nubes cirrus cerca de la tropopausa parecen críticas para determinar las características del movimiento vertical.
Conclusiones:
- Los patrones de movimiento vertical en la atmósfera tropical exhiben una clara transición vertical.
- Las nubes Cirrus juegan un papel importante en la modulación del movimiento vertical de la atmósfera en la tropopausa.
- Los hallazgos tienen importantes implicaciones para la comprensión del intercambio de masa atmosférica entre la troposfera y la estratosfera.
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