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Medidas GRACE de la variabilidad de la masa en el sistema terrestre
Byron D Tapley1, Srinivas Bettadpur, John C Ries
1Center for Space Research, University of Texas, Austin, TX 78712, USA.
Science (New York, N.Y.)
|July 27, 2004
Resumen
Los satélites del Experimento de Recuperación y Clima por Gravedad (GRACE) proporcionan mediciones mensuales precisas de la altura del geoide. Estas observaciones revelan cambios estacionales en la masa de agua en América del Sur, lo que ayuda a los estudios hidrológicos.
Área de la Ciencia:
- La geodesia es una técnica de geodesia.
- Hidrología Hidrología Hidrología.
- Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima
Sus antecedentes:
- Los satélites gemelos de Recuperación por Gravedad y Experimento Climático (GRACE) proporcionan estimaciones mensuales del campo de gravedad.
- Estas estimaciones logran una alta precisión de la altura del geoide (2-3 milímetros) a una resolución espacial de 400 kilómetros.
Objetivo del estudio:
- Analizar las variaciones anuales del geoide y su correlación con los procesos hidrológicos.
- Para diferenciar las señales hidrológicas entre la cuenca hidrográfica amazónica y las cuencas hidrográficas adyacentes más pequeñas.
Principales métodos:
- Utilizando los datos mensuales del campo gravitatorio de los satélites GRACE.
- Analizando las variaciones de altura del geoide y sus patrones estacionales.
- Comparando señales hidrológicas a través de diferentes cuencas hidrográficas de América del Sur.
Principales resultados:
- Se han observado variaciones anuales del geoide de hasta 10 milímetros, que alcanzan su punto máximo en primavera y otoño.
- Atribuyó variaciones geóideas significativas sobre América del Sur a cambios en la superficie y el agua subterránea.
- Demostró una clara distinción en las señales hidrológicas entre la Amazonia y las cuencas hidrográficas del norte.
Conclusiones:
- Los datos satelitales de GRACE capturan efectivamente los cambios hidrológicos a gran escala.
- Los hallazgos permiten la conexión de los procesos hidrológicos locales a escalas regionales y globales.
- Esta investigación mejora nuestra comprensión de la dinámica de las masas de agua en América del Sur.
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