Video Experimental Relacionado
Updated: Apr 30, 2026

07:08
CO2 Photoreduction to CH4 Performance Under Concentrating Solar Light
Published on: June 12, 2019
6.3K
Aumento del umbral de insolación para los procesos de efecto invernadero fuera de control en planetas similares a la
Jérémy Leconte1, Francois Forget1, Benjamin Charnay1
1Laboratoire de Météorologie Dynamique, Institut Pierre Simon Laplace, 4 Place Jussieu, BP 99, 75252 Paris, France.
Nature
|December 17, 2013
Resumen
La Tierra La Tierra La Tierra La Tierra La Tierra
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Modelado del clima Modelado del clima
- Física de la atmósfera Física de la atmósfera
Sus antecedentes:
- El aumento de la luminosidad solar puede conducir a efectos de efecto invernadero fuera de control.
- Los modelos unidimensionales tienen limitaciones en la predicción de los umbrales críticos de insolación.
- La nube y las retroalimentaciones dinámicas son cruciales para la estabilidad climática de la Tierra.
Objetivo del estudio:
- Determinar el umbral de insolación para un estado de invernadero descontrolado utilizando un modelo climático global en 3D.
- Para investigar el papel de las nubes y la dinámica atmosférica en la habitabilidad planetaria.
- Para reevaluar el potencial de agua líquida en Venus temprano.
Principales métodos:
- Utilizó un modelo tridimensional del clima global.
- Respuesta climática simulada de planetas similares a la Tierra al aumento de la insolación.
- Analizó el vapor de agua estratosférico y los efectos radiativos.
Principales resultados:
- El umbral de efecto invernadero fuera de control es de aproximadamente 375 W m-2, más alto de lo estimado previamente.
- Se encontró que las retroalimentaciones de la nube eran desestabilizadoras.
- El efecto estabilizador de la circulación de Hadley desplaza el límite de fuga a valores de insolación más altos.
Conclusiones:
- Los modelos 3D proporcionan una evaluación más precisa de los límites de efecto invernadero fuera de control.
- La habitabilidad planetaria puede extenderse a niveles de insolación más altos de lo que se pensaba anteriormente.
- Los hallazgos impactan la comprensión del clima pasado de Venus y la habitabilidad de los exoplanetas.
Videos de Conceptos Relacionados
Second Law of Thermodynamics
57.4K
The Second Law of Thermodynamics states that entropy, or the amount of disorder in a system, increases each time energy is transferred or transformed. Each energy transfer results in a certain amount of energy that is lost—usually in the form of heat—that increases the disorder of the surroundings. This can also be demonstrated in a classic food web. Herbivores harvest chemical energy from plants and release heat and carbon dioxide into the environment. Carnivores harvest the...
57.4K
Global Climate Change
24.4K
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.
24.4K
Second Law of Thermodynamics
21.7K
In the quest to identify a property that may reliably predict the spontaneity of a process, a promising candidate has been identified: entropy. Processes that involve an increase in entropy of the system (ΔS > 0) are very often spontaneous; however, examples to the contrary are plentiful. By expanding consideration of entropy changes to include the surroundings, a significant conclusion regarding the relation between this property and spontaneity may be reached. In thermodynamic...
21.7K
Acceleration due to Gravity on Other Planets
3.4K
The gravitational acceleration of an object near the Earth's surface is called the acceleration due to gravity. It can be measured by conducting simple experiments on Earth. However, such an experiment is impossible to conduct on the surface of other planets.
Astronomical observations are thus used to measure the acceleration due to gravity on other planets. This can be determined by observing the effect of a planet's gravity on objects close to it. The crucial factor that helps in this...
Astronomical observations are thus used to measure the acceleration due to gravity on other planets. This can be determined by observing the effect of a planet's gravity on objects close to it. The crucial factor that helps in this...
3.4K
Radiation: Applications
1.8K
The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
The average...
The average...
1.8K
Radiation Pressure: Problem Solving
1.0K
The radiation pressure applied by an electromagnetic wave on a perfectly absorbing surface equals the energy density of the wave. The wave's momentum also gets transferred to the surface when an electromagnetic wave is entirely absorbed by it. The rate at which momentum is transmitted to an absorbing surface perpendicular to the propagation direction equals the force on the surface.
The average value of the rate of momentum transfer divided by the absorbing area represents the average force...
The average value of the rate of momentum transfer divided by the absorbing area represents the average force...
1.0K

