Publication: Momento dipolar del campo magnético terrestre (últimos 300 años): aplicaciones a la paleoclimatología
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2017-12-13
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Universidad Complutense de Madrid
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Abstract
Para dar respuesta a las preguntas más relevantes dentro del campo de las Ciencias de la Tierra, como cuál es el origen del campo magnético terrestre, si estamos actualmente en un proceso de inversión del campo geomagnético y qué consecuencias podría tener sobre la vida humana, o si existe una relación entre el campo geomagnético y el clima, primero hay que preguntarse si nuestro conocimiento actual de la evolución pasada del campo magnético terrestre es lo suficientemente realista como para sacar conclusiones robustas, al menos para los últimos tres milenios. La evolución del campo geomagnético en el pasado se conoce gracias a las reconstrucciones globales, regional y locales que se realizan a partir de los datos instrumentales (de satélites y observatorios), históricos y, para épocas más antiguas, paleomagnéticos. Lamentablemente, la base de datos paleomagnéticos está muy pobremente distribuida espacio-temporalmente, incluso en el periodo con más datos disponibles, los últimos 3000 años. Su efecto en la seguridad con la que conocemos el campo geomagnético en el pasado y su cuantificación serían de vital importancia para dar respuesta a las preguntas con la que comenzamos esta sección. Además, la evolución del campo geomagnético en el pasado no es únicamente utilizada en el marco del Geomagnetismo, sino que existen múltiples aplicaciones a otras disciplinas. En esta tesis nos centraremos en dos de sus aplicaciones al campo de la Paleoclimatología: si existe una relación entre el campo geomagnético y el clima; y las correcciones por el campo geomagnético realizadas sobre los ritmos de producción de isótopos cosmogénicos en la atmósfera terrestre para determinar las reconstrucciones de actividad solar de los últimos 2000 años, usadas en modelos de variabilidad climática para reconstruir el clima del pasado...
In order to answer the most relevant questions in the field of Earth Sciences, i.e. what is the origin of the Earth's magnetic field, if a process of reversal of the geomagnetic field is currently occurring and what consequences might have on human life, or if there is a relation between the geomagnetic field and past climate, first we must know if our current knowledge of the past evolution of the Earth's magnetic field is realistic enough to draw robust conclusions, at least for the last three millennia. The evolution of the geomagnetic field in the past is known thanks to the global, regional and local reconstructions from the instrumental data (from satellites and observatories), historical and, for older times, palaeomagnetic data. Unfortunately, the palaeomagnetic database is very poorly distributed in space and time, even for the period with the most data available: the last 3000 years. Its effect on the accuracy of our knowledge on the geomagnetic field in the past and its quantification would be of vital importance to answer the question with which we start this section. In addition, the past evolution of the geomagnetic field is not only used in the framework of Geomagnetism, but also in other disciplines. In this thesis we will focus on two of its applications in the field of Palaeoclimatology: if there is a connection between the geomagnetic field and the climate in the past; and the corrections by the geomagnetic field carried out on the rates of production of cosmogenic radionuclides in the atmosphere used to determine the reconstructions of solar activity of the last 2000 years, and in climate variability models to reconstruct the climate of the past...
In order to answer the most relevant questions in the field of Earth Sciences, i.e. what is the origin of the Earth's magnetic field, if a process of reversal of the geomagnetic field is currently occurring and what consequences might have on human life, or if there is a relation between the geomagnetic field and past climate, first we must know if our current knowledge of the past evolution of the Earth's magnetic field is realistic enough to draw robust conclusions, at least for the last three millennia. The evolution of the geomagnetic field in the past is known thanks to the global, regional and local reconstructions from the instrumental data (from satellites and observatories), historical and, for older times, palaeomagnetic data. Unfortunately, the palaeomagnetic database is very poorly distributed in space and time, even for the period with the most data available: the last 3000 years. Its effect on the accuracy of our knowledge on the geomagnetic field in the past and its quantification would be of vital importance to answer the question with which we start this section. In addition, the past evolution of the geomagnetic field is not only used in the framework of Geomagnetism, but also in other disciplines. In this thesis we will focus on two of its applications in the field of Palaeoclimatology: if there is a connection between the geomagnetic field and the climate in the past; and the corrections by the geomagnetic field carried out on the rates of production of cosmogenic radionuclides in the atmosphere used to determine the reconstructions of solar activity of the last 2000 years, and in climate variability models to reconstruct the climate of the past...
Description
Tesis inédita de la Universidad Complutense de Madrid, Facultad de Ciencias Físicas, Departamento de Física de la Tierra, Astronomía y Astrofísica I (Geofísica y Meteorología), leída el 24-02-2017