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El crecimiento impulsado por las nevadas en la capa de hielo de la Antártida Oriental mitiga el reciente aumento del
Curt H Davis1, Yonghong Li, Joseph R McConnell
1Department of Electrical and Computer Engineering, University of Missouri-Columbia, Columbia, MO 65211, USA. davisch@missouri.edu
Science (New York, N.Y.)
|May 21, 2005
Resumen
La capa de hielo de la Antártida Oriental ganó masa significativa entre 1992 y 2003 debido al aumento de las precipitaciones, lo que ayudó a ralentizar el aumento global del nivel del mar.
Área de la Ciencia:
- Glaciología glaciología.
- Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima
- La detección remota con sensores.
Sus antecedentes:
- El equilibrio de masa de la capa de hielo antártica es crucial para comprender el cambio global del nivel del mar.
- Estudios anteriores han dado diferentes estimaciones de las tendencias de la masa de hielo de la Antártida.
Objetivo del estudio:
- Para cuantificar el cambio de masa en la capa de hielo de la Antártida Oriental interior. interior.
- Para investigar los impulsores de los cambios de masa observados.
- Para evaluar el impacto de estos cambios en el nivel global del mar.
Principales métodos:
- Datos de altimetría de radar de satélite desde 1992 hasta 2003.
- Comparación con las estimaciones de nevadas del modelo meteorológico.
Principales resultados:
- El interior de la capa de hielo de la Antártida Oriental (al norte de 81.6°S) ganó 45 ± 7 mil millones de toneladas métricas de hielo por año.
- Esta ganancia de masa está relacionada con el aumento de la precipitación.
- La ganancia de masa observada tiene el potencial de reducir el aumento global del nivel del mar en 0,12 ± 0,02 mm / año.
Conclusiones:
- El interior de la capa de hielo de la Antártida Oriental ha estado acumulando masa.
- El aumento de las nevadas es el principal impulsor de esta ganancia de masa.
- Esta acumulación de masa de hielo compensa parcialmente el aumento global del nivel del mar.
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