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Variaciones estacionales de la profundidad de la nieve en Marte
D E Smith1, M T Zuber, G A Neumann
1Laboratory for Terrestrial Physics, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA.
Science (New York, N.Y.)
|December 12, 2001
Resumen
Marte Marte es el planeta Marte.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- La geofísica es la geofísica.
Sus antecedentes:
- El ciclo estacional de dióxido de carbono en Marte influye en la elevación de la superficie y el aplanamiento planetario.
- Estudios anteriores carecían de mediciones precisas de estos cambios temporales.
Objetivo del estudio:
- Para cuantificar los cambios estacionales de elevación en Marte.
- Para determinar la densidad del dióxido de carbono estacionalmente depositado.
- Para investigar la relación entre la gravedad marciana y la topografía.
Principales métodos:
- Utilizó datos topográficos del altímetro láser del orbitador de Marte (MOLA) en la nave espacial Mars Global Surveyor (MGS).
- Análisis de residuos de seguimiento MGS Doppler para medir las variaciones temporales en el aplanamiento de Marte.
- Cambios de elevación correlacionados con el intercambio estacional de dióxido de carbono.
Principales resultados:
- Se midieron cambios de elevación significativos (1.5-2 metros) en altas latitudes marcianas (por encima de 80 grados).
- Se observó un período de sublimación inesperado durante el otoño del norte, coincidiendo con las tormentas de polvo del hemisferio sur.
- Restringido la densidad promedio de dióxido de carbono estacionalmente depositado a 910 +/- 230 kg/m3.
Conclusiones:
- La deposición estacional de dióxido de carbono y la sublimación causan cambios de elevación medibles en Marte.
- La densidad del hielo seco marciano es significativamente mayor que la de la nieve terrestre.
- Las variaciones temporales en la gravedad y el aplanamiento de Marte están vinculadas a los procesos de superficie.
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