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El reciente crecimiento de la capa de hielo en el interior de Groenlandia
Ola M Johannessen1, Kirill Khvorostovsky, Martin W Miles
1Mohn-Sverdrup Center for Global Ocean Studies and Operational Oceanography, Nansen Environmental and Remote Sensing Center, Bergen, 5006, Norway. ola.johannessen@nersc.no
Science (New York, N.Y.)
|October 22, 2005
Resumen
Groenlandia: Groenlandia es una de las islas más altas del mundo.
Área de la Ciencia:
- Glaciología glaciología.
- Ciencias del clima Ciencias del clima Ciencias del clima
- La detección remota con sensores.
Sus antecedentes:
- Estudios previos sugirieron una capa de hielo de Groenlandia de gran altitud equilibrada.
- Se ha informado de que los márgenes de las capas de hielo se están adelgazando.
Objetivo del estudio:
- Para analizar los datos de altura del altímetro de la capa de hielo de Groenlandia de 1992 a 2003.
- Para determinar los cambios de elevación en las áreas interiores y marginales.
- Investigar los vínculos entre los cambios de elevación y los patrones climáticos.
Principales métodos:
- Análisis de un conjunto continuo de datos de la altura del altímetro de la capa de hielo de Groenlandia.
- Se utilizaron datos de los satélites europeos de teledetección (ERS-1 y ERS-2).
- Cambios de elevación invernales correlacionados con la Oscilación del Atlántico Norte.
Principales resultados:
- Un aumento significativo de 6,4 cm/año en las áreas interiores por encima de 1500 metros.
- Una disminución de -2,0 cm/año en áreas por debajo de 1500 metros, lo que indica el adelgazamiento del margen.
- Un aumento general de elevación promedio de 5,4 cm/año en toda la zona de estudio.
- Demostró un vínculo entre los cambios de elevación en invierno y la Oscilación del Atlántico Norte.
Conclusiones:
- El interior de la capa de hielo de Groenlandia no está en equilibrio y se está engrosando.
- Los márgenes de las capas de hielo se están adelgazando, en consonancia con hallazgos anteriores.
- Los cambios de elevación están influenciados por la variabilidad climática, específicamente la Oscilación del Atlántico Norte.
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