Video Experimental Relacionado
Updated: May 3, 2026
09:03
Assessment of Methane and Nitrous Oxide Fluxes from Paddy Field by Means of Static Closed Chambers Maintaining Plants Within Headspace
Published on: September 6, 2018
15.8K
Los niveles de fondo de metano en la atmósfera de Marte muestran fuertes variaciones estacionales
Christopher R Webster1, Paul R Mahaffy2, Sushil K Atreya3
1NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA. chris.r.webster@jpl.nasa.gov.
Science (New York, N.Y.)
|June 9, 2018
Resumen
El metano en Marte muestra cambios estacionales repetibles, no fluctuaciones aleatorias. Los datos del rover Curiosity sugieren que las fuentes localizadas de la superficie o del subsuelo son responsables de estas variaciones atmosféricas.
Área de la Ciencia:
- Ciencias planetarias
- Astrobiología
- Ciencias atmosféricas
Sus antecedentes:
- Los niveles de metano en la atmósfera de Marte son variables y poco conocidos.
- Las mediciones anteriores carecían de repetibilidad en el tiempo y la ubicación, lo que dificultaba la explicación.
Objetivo del estudio:
- Para investigar la fuente y la variabilidad del metano en la atmósfera marciana.
- Para analizar las mediciones in situ en busca de patrones repetibles.
Principales métodos:
- Utilizó el espectrómetro láser sintonizable en el rover Curiosity para mediciones in situ.
- Recogió datos durante un período de 5 años dentro del cráter Gale.
Principales resultados:
- Se estableció una variación estacional repetible en los niveles de fondo de metano (0,24 a 0,65 partes por mil millones en volumen).
- Se observó una concentración media de fondo de metano de 0,41 ± 0,16 ppbv.
- Se detectaron picos ocasionales de metano de hasta ~7 ppbv.
Conclusiones:
- La variación estacional de metano observada excede las predicciones de los procesos de superficie conocidos.
- Los resultados son consistentes con la liberación localizada de metano de las reservas de superficie o subterráneas de Marte.
Videos de Conceptos Relacionados
01:14The Carbon Cycle
32.8K
Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
32.8K
01:18Variation of Atmospheric Pressure
3.6K
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...
3.6K
01:26Influence of Earth's Curvature and Atmospheric Refraction on Leveling
1.3K
During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance.
1.3K
01:26Microbes and Methanogenesis
91
Methanogenesis is a critical microbial process in anaerobic ecosystems responsible for the biological production of methane, a potent greenhouse gas and valuable biofuel. This metabolic pathway is primarily facilitated by methanogenic archaea, which thrive in anoxic environments such as wetlands, sediments, and animal gastrointestinal tracts. The absence of oxygen in these habitats prevents aerobic respiration, thereby favoring alternative biochemical pathways for organic matter degradation.In...
91
01:18Deep Sea Microbial Ecology
53
The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches...
53
01:27Microbes and Climate Change
91
Microorganisms are pivotal agents in Earth's biogeochemical cycles, significantly influencing climate dynamics through their metabolic activities. These microbes modulate the levels of key greenhouse gases by both contributing to and helping mitigate climate change.Microbial Contributions to Greenhouse Gas EmissionsRising global temperatures accelerate microbial metabolism, which, in turn, speeds up the decomposition of organic matter. This process releases carbon dioxide (CO₂) through...
91