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Control dominante del monzón del sur de Asia por aislamiento orográfico frente al calentamiento de la meseta
William R Boos1, Zhiming Kuang
1Department of Earth and Planetary Sciences.
Nature
|January 16, 2010
Resumen
La meseta tibetana es la meseta tibetana.
Área de la Ciencia:
- Climatología y climatología.
- Ciencias de la atmósfera Ciencias atmosféricas.
- La geofísica es la geofísica.
Sus antecedentes:
- La gran elevación de la meseta tibetana se considera tradicionalmente un conductor principal del monzón de verano del sur de Asia.
- Las suposiciones anteriores vinculaban el levantamiento de la meseta con los cambios climáticos en la escala de tiempo geológico.
- Las observaciones climáticas actuales muestran un pico de calor de la troposfera superior sobre la India, no la meseta, lo que cuestiona su papel dominante.
Objetivo del estudio:
- Para investigar el papel real de la meseta tibetana como fuente de calor para el monzón de verano del sur de Asia.
- Reevaluar la influencia de las cadenas montañosas, específicamente el Himalaya, en la dinámica de los monzones.
- Comprender el impacto de la superficie terrestre y el forzamiento radiativo en el clima regional.
Principales métodos:
- Utilizó un modelo atmosférico para simular la circulación del monzón con y sin el forzamiento térmico de la meseta tibetana.
- Preservó la estrecha orografía del Himalaya y las cadenas montañosas adyacentes en experimentos modelo.
- Analizó los datos de observación y los resultados del modelo para evaluar las respuestas climáticas regionales.
Principales resultados:
- La eliminación del efecto de calentamiento de la meseta tibetana no alteró significativamente la circulación del monzón de verano del sur de Asia a gran escala.
- Se descubrió que el calentamiento de la meseta aumentaba las precipitaciones locales a lo largo de su borde sur.
- El Himalaya y las montañas asociadas parecen cruciales para mantener el monzón al aislar el aire cálido de la India de las regiones extratropicas más frías.
Conclusiones:
- El estudio desafía la visión de larga data de la meseta tibetana como el controlador dominante del monzón de verano del sur de Asia.
- La orografía montañosa, particularmente el Himalaya, juega un papel crítico en la configuración de la intensidad del monzón.
- Los hallazgos requieren una reinterpretación de las respuestas climáticas pasadas a la elevación orográfica y los impactos futuros del cambio climático.
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