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Reciente pérdida de masa de hielo de Groenlandia por el sistema de drenaje de las observaciones de la gravedad por
S B Luthcke1, H J Zwally, W Abdalati
1Planetary Geodynamics Laboratory, Code 698, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA. Scott.B.Luthcke@nasa.gov
Science (New York, N.Y.)
|October 21, 2006
Resumen
La capa de hielo de Groenlandia perdió 101 gigatoneladas de hielo anualmente entre 2003 y 2005, principalmente en las elevaciones más bajas. Esto indica un cambio significativo desde su estado casi equilibrado en la década de 1990.
Área de la Ciencia:
- * Glaciología y Ciencias del Clima.
- * Observación de la Tierra y Geofísica.
Sus antecedentes:
- * El equilibrio de masa de la capa de hielo de Groenlandia es crucial para comprender el aumento global del nivel del mar.
- * Las estimaciones anteriores de la pérdida de hielo han variado, lo que requiere análisis regionales refinados.
Objetivo del estudio:
- * Para cuantificar los cambios de masa de la capa de hielo de Groenlandia utilizando datos de sistemas de drenaje regionales.
- * Para analizar los patrones espaciales y temporales de la pérdida de masa de hielo de 2003 a 2005.
Principales métodos:
- * Utilizado el análisis de concentración de masa local de las observaciones de la misión Gravity Recovery and Climate Experiment (GRACE).
- * Cambios de masa resueltos por regiones específicas del sistema de drenaje de la capa de hielo de Groenlandia.
Principales resultados:
- * La pérdida total de hielo promedió 101 +/- 16 gigatoneladas por año entre 2003 y 2005.
- * Las elevaciones más bajas experimentaron una pérdida de masa significativa (155 gigatoneladas / año) con ciclos estacionales pronunciados.
- * Las elevaciones más altas (por encima de 2000 metros) mostraron una ganancia de 54 gigatoneladas / año.
Conclusiones:
- * La capa de hielo de Groenlandia exhibió un balance de masa sustancialmente negativo entre 2003 y 2005, un cambio notable desde la década de 1990.
- * El análisis regional revela patrones distintos de cambio de masa, siendo las elevaciones más bajas los principales contribuyentes a la pérdida general de hielo.
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