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Tributarios de las corrientes de hielo de la Antártida Occidental revelados por la interferometría de RADARSAT

Joughin¹, Gray, Bindschadler

¹Jet Propulsion Laboratory, California Institute of Technology, M/S 300-235, 4800 Oak Grove Drive, Pasadena, CA 91109, USA. Canada Centre for Remote Sensing, Applications Division, 588 Booth Street, Ottawa, Ontario K1A 0Y7, Canada. Code 971, Oceans and Ice Branch, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA. SAIC General Sciences Corporation, 4600 Powder Mill Road, Beltsville, MD 20705-2675, USA. Institute for Geophysics, University of Texas at Austin, 4412 Spicewood Springs Road 600, Austin, TX 78759, USA.

Science (New York, N.Y.)

|October 9, 1999

Resumen

Los datos RADARSAT interferométricos revelan cómo las corrientes de hielo de la Antártida Occidental se conectan con los afluentes interiores. Algunos afluentes que alimentan a la estancada Corriente de Hielo C están causando un rápido engrosamiento del hielo, un hallazgo antártico significativo.

Área de la Ciencia:

Glaciología glaciología.
La detección remota con sensores.
Ciencia de la Antártida Ciencia de la Antártida

Sus antecedentes:

Las corrientes de hielo de la Antártida Occidental son cruciales para el aumento del nivel del mar.
Comprender la dinámica del hielo en las regiones de origen es clave para predecir la pérdida futura de hielo.
La topografía subglacial influye en el flujo del hielo.

Objetivo del estudio:

Mapear el movimiento del hielo en las regiones de origen de cuatro corrientes de hielo de la Antártida Occidental.
Para investigar la transición del lento flujo interior al rápido flujo de la corriente de hielo.
Para analizar el engrosamiento del hielo en regiones estancadas.

Principales métodos:

Se utilizaron datos interferométricos de RADARSAT.
Mapeo del movimiento del hielo utilizando interferometría de radar por satélite.
Analizó la velocidad del hielo y los cambios en la elevación de la superficie.

Principales resultados:

Identificó los afluentes como extensas zonas de transición entre el flujo lento y rápido del hielo.
Reveló regiones de fuentes compartidas para las corrientes de hielo adyacentes.
Se observó un espesamiento significativo del hielo (0,49 m / año) en una región alimentada por afluentes en la Corriente de Hielo C, una de las tasas más altas registradas en la Antártida.

Conclusiones:

Los valles subglaciales guían el flujo tributario, influyendo en la dinámica de las corrientes de hielo.
Las corrientes de hielo pueden extraerse de regiones de fuentes interconectadas y compartidas.
El rápido engrosamiento en áreas estancadas pone de relieve la compleja dinámica del hielo y su potencial inestabilidad.

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