Video Experimental Relacionado
Updated: May 13, 2026
10:39
Multimodal Optical Microscopy Methods Reveal Polyp Tissue Morphology and Structure in Caribbean Reef Building Corals
Published on: September 5, 2014
Acoplamiento de polvo y clima del Océano Austral en los últimos cuatro millones de años
Alfredo Martínez-Garcia1, Antoni Rosell-Melé, Samuel L Jaccard
1Geological Institute, ETH Zürich, Zürich 8092, Switzerland. alfredo.martinez-garcia@erdw.ethz.ch
Nature
|August 5, 2011
Resumen
El suministro de polvo al Océano Antártico aumentó significativamente hace unos 1,25 millones de años, coincidiendo con el inicio de las principales edades de hielo. Este hallazgo vincula el aumento del polvo atmosférico con la Tierra.
Área de la Ciencia:
- Paleoclimatología y Ciencias del Sistema Terrestre.
- Geoquímica marina y sedimentología.
- Dinámica del clima cuaternario Dinámica del clima cuaternario
Sus antecedentes:
- El polvo atmosférico influye en el clima global al alterar el equilibrio radiativo y proporcionar micronutrientes oceánicos como el hierro.
- La deposición de polvo en el Océano Antártico y la "fertilización de hierro" asociada están implicadas en la reducción de dióxido de carbono atmosférico durante los períodos glaciales.
- El papel a largo plazo del polvo del Océano Antártico en los ciclos glaciales del Pleistoceno sigue siendo poco comprendido.
Videos de Conceptos Relacionados
01:14The Carbon Cycle
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.
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.
01:50Global 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.
01:07Speciation Rates
Overview
01:21Isothermal Processes
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...
01:27Microbes and Climate Change
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...