Video Experimental Relacionado
Updated: Feb 23, 2026
11:19
Measuring Carbon-based Contaminant Mineralization Using Combined CO2 Flux and Radiocarbon Analyses
Published on: October 21, 2016
12.4K
Liberación muy grande de carbono principalmente volcánico durante el Máximo Térmico Paleoceno-Eoceno
Marcus Gutjahr1,2, Andy Ridgwell3,4, Philip F Sexton5
1Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Southampton SO17 1BJ, UK.
Nature
|September 1, 2017
Resumen
La actividad volcánica, no los hidratos de metano, probablemente desencadenó el evento de calentamiento global del Paleoceno-Eoceno (PETM). Esta masiva liberación de carbono reformó el clima de la Tierra y la química de los océanos.
Área de la Ciencia:
- Paleoclimatología
- Geoquímica
- Ciencias del Sistema Terrestre
Sus antecedentes:
- El Máximo Térmico Paleoceno-Eoceno (PETM) es un evento significativo de calentamiento global.
- El motor principal del PETM, ya sean reservas de carbono superficiales u otras fuentes, sigue siendo objeto de debate.
- Comprender la causa del PETM es crucial para la investigación del cambio climático.
Objetivo del estudio:
- Investigar la fuente de carbono responsable del PETM.
- Para reconstruir la dinámica del ciclo del carbono durante este antiguo evento de calentamiento.
- Diferenciar entre los mecanismos de activación y los procesos de retroalimentación en los eventos climáticos.
Principales métodos:
- Análisis de los isótopos de boro como sustituto del pH del agua de mar.
- Integración de los datos de pH con los registros de isótopos de carbono.
- Utilizando un modelo del sistema de la Tierra para simular la dinámica del ciclo del carbono.
Principales resultados:
- Se registró un pH persistentemente bajo en la superficie del océano durante el PETM.
- La evidencia sugiere una fuente de carbono significativamente mayor (más de 10,000 Pg) e isotópicamente más pesada de lo estimado anteriormente.
- El volcanismo vinculado a la Provincia Ígnea del Atlántico Norte se identifica como el conductor principal.
Conclusiones:
- La actividad volcánica, no los hidratos de metano, fue el principal impulsor del PETM.
- Las retroalimentaciones de carbono orgánico impulsadas por el clima jugaron un papel menor en el inicio del evento.
- El enterramiento mejorado de materia orgánica fue clave para secuestrar carbono y facilitar la recuperación del sistema terrestre.
Videos de Conceptos Relacionados
01:50Global Climate Change
29.2K
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.
29.2K
01:14The Carbon Cycle
44.5K
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.
44.5K
02:56The Fossil Record
27.6K
The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
27.6K
01:24Carbonation Shrinkage
517
Atmospheric CO2 penetrates the concrete's pores and, in the presence of moisture, forms carbonic acid, which then reacts with calcium hydroxide in the hydrated cement, forming calcium carbonate. This process reduces the concrete's volume and is termed carbonation shrinkage.
The concrete's permeability is slightly reduced as calcium carbonate produced during the reaction fills its pores. Furthermore, its strength is slightly enhanced as the water released during the reaction...
The concrete's permeability is slightly reduced as calcium carbonate produced during the reaction fills its pores. Furthermore, its strength is slightly enhanced as the water released during the reaction...
517
01:21Isothermal Processes
5.1K
A thermodynamic process that occurs at constant temperature is called an isothermal process. Heat slowly flows into the system or out of the system to maintain thermal equilibrium. Processes involving phase changes like water evaporation into steam or freezing water into ice at a constant temperature are examples of Isothermal Processes.
An ideal gas can also undergo isothermal expansion or compression.
For example, consider 1 mole of an ideal gas inside an isolated cylinder at initial volume V...
An ideal gas can also undergo isothermal expansion or compression.
For example, consider 1 mole of an ideal gas inside an isolated cylinder at initial volume V...
5.1K
01:28Carbon-dioxide Fixation
765
Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
765