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La oscilación hidrológica interhemisférica de latitudes medias en los últimos 550.000 años
Kyoung-nam Jo1, Kyung Sik Woo2, Sangheon Yi1
1Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, South Korea.
Nature
|April 4, 2014
Resumen
Un estudio revela que el columpio hidrológico interhemisférico, impulsado por los cambios en la Zona de Convergencia Intertropical (ZCIT), se extiende a las regiones de latitud media. Este fenómeno, observado en espeleotemas coreanos, impacta los sistemas climáticos templados y los ciclos globales de la edad de hielo.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- La dinámica del clima La dinámica del clima La dinámica del clima
- La geoquímica es la geoquímica.
Sus antecedentes:
- La Zona de Convergencia Intertropical (ZCIT) influye en las precipitaciones regionales a través de cambios de latitud.
- Un columpio hidrológico interhemisférico describe las tendencias de precipitación antifase entre los hemisferios.
- Estudios anteriores sugirieron que este columpio opera en regiones tropicales y subtropicales.
Objetivo del estudio:
- Investigar la influencia del columpio hidrológico interhemisférico en las regiones de mayor latitud y el sistema climático global.
- Para determinar si el antifasamiento hidrológico observado en los trópicos se extiende a latitudes medias.
Principales métodos:
- Análisis de un registro de frecuencia de crecimiento de espeleotemas de 550.000 años de la península de Corea.
- Comparación de los datos de espeleotemas coreanos con los registros de espeleotemas del hemisferio sur para identificar el antifasado hemisférico.
Principales resultados:
- Se identificó el antifasamiento hemisférico de la precipitación, indicativo del columpio hidrológico, en la latitud media del Pacífico occidental, que se extiende hasta el noreste de Asia.
- La influencia de la oscilación hidrológica interhemisférica ha alcanzado al menos latitudes medias en los últimos 550.000 años.
Conclusiones:
- Los desplazamientos de la escala de tiempo orbital de la ITCZ tienen un impacto significativo en los sistemas climáticos templados.
- La oscilación hidrológica interhemisférica puede influir en el vapor de agua y las retroalimentaciones de la vegetación en las latitudes medias del norte, lo que podría regular los ciclos de la edad de hielo del Cuaternario.
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