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Cambios rápidos en la descarga de hielo de los glaciares de salida de Groenlandia
Ian M Howat1, Ian Joughin, Ted A Scambos
1Polar Science Center, Applied Physics Lab, University of Washington, 1013 Northeast 40th Street, Seattle, WA 98105-6698, USA. ihowat@apl.washington.edu
Resumen
Groenlandia Groenlandia es el nombre de la isla.
Área de la Ciencia:
- Glaciología glaciología.
- Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima
- Observación de la Tierra Observación de la Tierra
Sus antecedentes:
- Los glaciares de salida de Groenlandia son contribuyentes significativos al aumento global del nivel del mar.
- Comprender las variaciones a corto plazo en la descarga de hielo es crucial para modelos climáticos precisos.
Objetivo del estudio:
- Para analizar la reciente descarga de hielo y la dinámica de pérdida de masa de dos grandes glaciares de salida de Groenlandia.
- Para investigar las causas de las fluctuaciones a corto plazo en el equilibrio de masa de los glaciares.
Principales métodos:
- Se utilizaron datos de elevación y velocidad de la superficie derivados de satélites.
- Analizó los cambios temporales en la descarga de hielo y la geometría del glaciar.
Principales resultados:
- Se observó una duplicación de la tasa de pérdida de masa combinada en menos de un año (2004).
- Las tasas de pérdida de masa volvieron a los niveles anteriores en 2006, atribuidas al reequilibrio del frente de parto.
- La pérdida total de masa fue una fracción de las estimaciones derivadas de la gravedad, lo que sugiere otros mecanismos de pérdida.
Conclusiones:
- A corto plazo, el reequilibrio rápido de la geometría de los glaciares tiene un impacto significativo en la pérdida de masa.
- El monitoreo de alta resolución de la dinámica de los glaciares de salida es esencial para refinar las predicciones de aumento del nivel del mar.
- Las discrepancias con las estimaciones derivadas de la gravedad resaltan la necesidad de enfoques observacionales integrados.
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