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Un registro milenario de alta resolución del monzón del sur de Asia a partir de núcleos de hielo del Himalaya
Thompson1, Yao, Mosley-Thompson
1Byrd Polar Research Center, The Ohio State University, Columbus, OH 43210, USA. Cold and Arid Regions Environmental and Engineering Institute, Chinese Academy of Sciences, Lanzhou China. Department of Geological Sciences, Department of Geography,
Science (New York, N.Y.)
|September 16, 2000
Resumen
Un núcleo de hielo tibetano revela el monzón del sur de Asia.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Glaciología glaciología.
- Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima
Sus antecedentes:
- Los núcleos de hielo proporcionan valiosos registros paleoclimáticos.
- La meseta tibetana es sensible a las variaciones del monzón del sur de Asia.
Objetivo del estudio:
- Para reconstruir la intensidad pasada del monzón del sur de Asia utilizando un registro de núcleos de hielo de alta resolución de Dasuopu, Tíbet.
- Investigar el impacto de las actividades antropogénicas del siglo XX en el clima regional.
Principales métodos:
- Análisis de las concentraciones de polvo y cloruro en un núcleo de hielo de Dasuopu, Tibet.
- Datación de alta resolución de las secciones del núcleo de hielo.
- Comparación con datos climáticos históricos y actividad antropogénica regional.
Principales resultados:
- El núcleo de hielo de Dasuopu muestra sensibilidad a las fluctuaciones del monzón del sur de Asia, con niveles de polvo y cloruro que indican la intensidad de la sequía.
- La sequía más severa registrada ocurrió entre 1790-1796 d.C.
- Un aumento significativo en las concentraciones de polvo y cloruro en el siglo XX refleja una mayor actividad antropogénica en la India y Nepal.
- La evidencia de una tendencia al calentamiento en toda la meseta del siglo XX, amplificada en altitudes más altas, es consistente con otros núcleos de hielo tibetanos.
Conclusiones:
- El núcleo de hielo de Dasuopu proporciona un registro detallado de la variabilidad pasada de los monzones y los eventos de sequía.
- Los cambios climáticos del siglo XX en la región están fuertemente relacionados con el aumento de las actividades humanas.
- La meseta tibetana está experimentando un calentamiento amplificado, con implicaciones para la hidrología regional y los ecosistemas.
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