Video Experimental Relacionado
Updated: Jul 12, 2026
11:34
Scattering And Absorption of Light in Planetary Regoliths
Published on: July 1, 2019
Variabilidad interanual de las tormentas de polvo globales en Marte
Science (New York, N.Y.)
|October 24, 1986
Resumen
Las tormentas de polvo globales en Marte dependen de los patrones de circulación del hemisferio. El polvo del hemisferio norte puede debilitar la circulación de Hadley del sur, evitando los eventos de polvo que rodean al planeta.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Ciencias de la atmósfera Ciencias atmosféricas.
- Ciencia de Marte Ciencia de Marte Ciencia de Marte
Sus antecedentes:
- Las tormentas de polvo globales en Marte exhiben variabilidad interanual, ocurriendo en algunos años pero no en otros.
- Las misiones vikingas proporcionaron cuatro años de datos de Marte, ofreciendo información sobre estos patrones de tormentas.
Objetivo del estudio:
- Para inferir las características distintivas de las tormentas de polvo marcianas globales basadas en los datos disponibles.
- Investigar el papel de la circulación atmosférica, específicamente la circulación de Hadley, en el inicio y la variabilidad de estas tormentas.
Principales métodos:
- Análisis de los datos de la misión vikinga que abarca cuatro años en Marte.
- Simulaciones numéricas para modelar el impacto de las condiciones atmosféricas en el desarrollo de tormentas de polvo.
Principales resultados:
- Las tormentas de polvo globales están asociadas con el polvo levantado en el hemisferio sur y difundido por una intensificada circulación de Hadley.
- Años sin tormentas globales muestran polvo levantado en el hemisferio norte, pero no se extiende globalmente.
- La neblina de polvo del hemisferio norte debilita la circulación trans-equatorial de Hadley, reduciendo la probabilidad de que se desarrolle una tormenta de polvo global.
Conclusiones:
- La variabilidad interanual de las tormentas de polvo globales marcianas puede ser el resultado de la competencia de circulación hemisférica o el ciclo de polvo entre hemisferios.
- La circulación de Hadley juega un papel crítico en el inicio de las tormentas de polvo globales, con el polvo del hemisferio norte actuando como un potencial inhibidor.
Videos de Conceptos Relacionados
01:50Global Climate Change
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.
01:16What is Climate?
Climate refers to the prevailing weather conditions in a specific area over an extended period. As the saying goes, “Climate is what you expect. Weather is what you get.” Climate is influenced by geographic factors, such as latitude, terrain, and proximity to bodies of water.
01:10Kepler's First Law of Planetary Motion
In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. He formulated his first two laws based on the observations of his forebears, Nikolaus Copernicus and Tycho Brahe.
Polish astronomer Nikolaus Copernicus put forth a theory that stated a heliocentric model for the solar system. According to this heliocentric theory, all the planets, including Earth, orbit the Sun in circular orbits.
On the other hand,...
Polish astronomer Nikolaus Copernicus put forth a theory that stated a heliocentric model for the solar system. According to this heliocentric theory, all the planets, including Earth, orbit the Sun in circular orbits.
On the other hand,...
01:24Acceleration due to Gravity on Other Planets
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...
01:18Variation of Atmospheric Pressure
Change in atmospheric pressure with height is particularly interesting. The decrease in atmospheric pressure with increasing altitude is due to the decreasing gravitational force per unit area as we move away from the surface of the earth.
Assuming the air temperature is constant at a given altitude and that the ideal gas law of thermodynamics describes the atmosphere to a good approximation, one can find the variation of atmospheric pressure with height.
Let p(y) be the atmospheric pressure at...
Assuming the air temperature is constant at a given altitude and that the ideal gas law of thermodynamics describes the atmosphere to a good approximation, one can find the variation of atmospheric pressure with height.
Let p(y) be the atmospheric pressure at...
01:15Torque Free Motion
The torque-free motion refers to the movement of a rigid body in space when no external torques are acting upon it. This type of motion can be observed in environments where there are no external forces or frictions, like in outer space. For example, a rotation of Mars in space is a torque-free motion. Mars is an axisymmetric object, meaning it has an axis of symmetry along which it rotates, designated as the z-axis. The rotating frame of reference is defined such that the center of mass of...