Video Experimental Relacionado
Updated: Apr 17, 2026

06:55
Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling
Published on: August 5, 2016
8.6K
La inclinación combinada y el aceleramiento de precesión de las deglaciaciones del Pleistoceno tardío
1Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, Massachusetts 02138, USA. phuybers@fas.harvard.edu
Nature
|December 14, 2011
Resumen
La Tierra La Tierra La Tierra La Tierra La Tierra
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Ciencias del clima Ciencias del clima Ciencias del clima
- La geofísica es la geofísica.
Sus antecedentes:
- Se propone que los ciclos de Milankovitch influyan en los estados glaciales de la Tierra.
- Estudios anteriores sugirieron que la oblicuidad marca el ritmo de los ciclos glaciales, pero el papel de la precesión no estaba claro.
- Las incertidumbres de tiempo han dificultado las pruebas cuantitativas de forzamiento orbital en la deglaciación.
Objetivo del estudio:
- Probar cuantitativamente el doble efecto de la oblicuidad y la precesión en los ciclos glaciales del Pleistoceno tardío.
- Para superar las deficiencias de control de tiempo en el análisis del ritmo orbital de la deglaciación.
- Proporcionar pruebas sólidas de la influencia combinada de los parámetros orbitales en el cambio climático.
Principales métodos:
- Desarrollo de una nueva prueba estadística centrada en los máximos en el forzamiento orbital.
- Análisis de los ciclos glaciales del Pleistoceno tardío.
- Análisis por fases de los efectos de oblicuidad y precesión.
Principales resultados:
- Se encontró que tanto la oblicuidad como la precesión marcaban el ritmo de los ciclos glaciales del Pleistoceno tardío.
- Un nuevo método estadístico superó con éxito los problemas de control de tiempo.
- Los resultados apoyan la hipótesis de Milankovitch con respecto a los estados interglaciales.
Conclusiones:
- La oblicuidad y la precesión actúan conjuntamente para acelerar los ciclos glaciales del Pleistoceno tardío.
- Los hallazgos confirman la doble función del forzamiento orbital en la deglaciación.
- Los veranos más largos en el hemisferio sur también pueden contribuir a la deglaciación.
Videos de Conceptos Relacionados
Global Climate Change
29.9K
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
29.9K
Gyroscope: Precession
6.1K
Precession can be demonstrated effectively through a spinning top. If a spinning top is placed on a flat surface near the surface of the Earth at a vertical angle and is not spinning, it will fall over due to the force of gravity producing a torque acting on its center of mass. However, if the top is spinning on its axis, it precesses about the vertical direction, rather than topple over due to this torque. Precessional motion is a combination of a steady circular motion of the axis and the...
6.1K
Apparent Weight and the Earth's Rotation
4.5K
Since all objects on the Earth's surface move through a circle every 24 hours, there must be a net centripetal force on each object, directed towards the center of that circle. The points of the north and south poles are the only exception to this rule.
For an object on the Earth's equator, the net centripetal force that accounts for its rotation is the Earth's pull towards its center, or the weight minus the normal force that prevents it from piercing into the Earth's surface....
For an object on the Earth's equator, the net centripetal force that accounts for its rotation is the Earth's pull towards its center, or the weight minus the normal force that prevents it from piercing into the Earth's surface....
4.5K
Atomic Nuclei: Larmor Precession Frequency
3.8K
The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
3.8K
Isochoric and Isobaric Processes
5.5K
A thermodynamic process that occurs at constant volume is called an isochoric process. According to the first law of thermodynamics, heat supplied or removed from the system is partially utilized to perform work and change the internal energy of the system. However, in an isochoric process, the volume remains constant. Hence, the work done by the system is zero. Therefore, the exchange of heat changes the internal energy of the system only.
Suppose 1000 g of water is heated from 40...
Suppose 1000 g of water is heated from 40...
5.5K
Curvilinear Motion: Polar Coordinates
1.2K
In polar coordinates, the motion of a particle follows a curvilinear path. The radial coordinate symbolized as 'r,' extends outward from a fixed origin to the particle, while the angular coordinate, 'θ,' measured in radians, represents the counterclockwise angle between a fixed reference line and the radial line connecting the origin to the particle.
The particle's location is described using a unit vector along the radial direction. Deriving the particle's position...
The particle's location is described using a unit vector along the radial direction. Deriving the particle's position...
1.2K

