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El presupuesto del momento angular de la Tierra en escalas temporales subestacionales
Resumen
Los paros atmosféricos impulsan cambios irregulares en la longitud del día (LOD). Existe coherencia entre el LOD y el momento angular atmosférico (AAM) hasta períodos de 8 días, pero los períodos más cortos carecen de coherencia debido al ruido.
Área de la Ciencia:
- La geofísica es la geofísica.
- Ciencias de la atmósfera Ciencias atmosféricas.
- La astronomía es la astronomía.
Sus antecedentes:
- Las fluctuaciones irregulares de la longitud del día (LOD) son impulsadas principalmente por los pares atmosféricos.
- Comprender las variaciones de rotación de la Tierra es crucial para el cronometraje preciso y los estudios geofísicos.
Objetivo del estudio:
- Para investigar la relación entre las variaciones de la longitud del día (LOD) y el momento angular atmosférico (AAM).
- Para identificar las causas de las discrepancias en los datos de LOD y AAM en diferentes escalas de tiempo.
Principales métodos:
- Análisis de datos de series temporales para LOD y AAM.
- Análisis de coherencia para determinar correlaciones entre LOD y AAM en diferentes períodos.
- Revisión de los modelos existentes para las variaciones de rotación de la Tierra.
Principales resultados:
- Se observó una coherencia significativa entre las series temporales LOD y AAM hasta los períodos de 8 días.
- La falta de coherencia en períodos más cortos se atribuye a la disminución de las relaciones señal-ruido en ambos conjuntos de datos.
- Los modelos existentes de variaciones de rotación de la Tierra por marea pueden requerir refinamiento para incluir los efectos oceánicos.
Conclusiones:
- Los procesos atmosféricos son uno de los principales contribuyentes a las variaciones de LOD a corto plazo.
- Se necesita más investigación para resolver las discrepancias entre LOD y AAM, que potencialmente involucran influencias oceánicas o componentes de momento angular no modelados.
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