Video Experimental Relacionado
Updated: Feb 3, 2026
08:23
Seawater Sampling and Collection
Published on: June 17, 2009
20.8K
Expansión glacial del agua de mar empobrecida de oxígeno en el Pacífico tropical oriental
Babette A A Hoogakker1,2, Zunli Lu3,4, Natalie Umling5
1The Lyell Centre, Heriot-Watt University, Edinburgh, UK. b.hoogakker@hw.ac.uk.
Nature
|October 19, 2018
Resumen
El almacenamiento de carbono en el océano puede explicar la disminución del dióxido de carbono atmosférico durante las edades de hielo. Una nueva investigación muestra un agotamiento del oxígeno en el océano Pacífico glacial, aumentando su reserva de carbono.
Área de la Ciencia:
- Paleoceanografía
- Biogeoquímica marina
- Ciencias del clima
Sus antecedentes:
- El almacenamiento de carbono oceánico es un mecanismo propuesto para reducir el CO2 atmosférico durante las edades de hielo.
- Estudios anteriores sugirieron un menor oxígeno en las profundidades oceánicas, pero mejores aguas superiores oxigenadas en el Pacífico glacial.
- Esta oposición vertical indicó un cambio neto mínimo en el almacenamiento de carbono oceánico.
Objetivo del estudio:
- Para reconstruir los cambios en la extensión de agua baja en oxígeno en el Pacífico tropical oriental desde la última edad de hielo.
- Para investigar el papel del reservorio de carbono del Océano Pacífico en la reducción de CO2 atmosférico glacial.
Principales métodos:
- Se utilizó un enfoque de doble representación que combina las reconstrucciones de oxígeno de la columna de agua superior y la de agua inferior.
- Se han aplicado datos cuantitativos de oxígeno de aguas profundas para estimar el depósito de carbono respirado.
Principales resultados:
- Evidencia de expansión hacia abajo del agotamiento de oxígeno en el Pacífico oriental durante el último período glacial.
- No hay indicios de aumento de la oxigenación en la columna de agua superior durante la glaciación.
- Aumento sustancial de las reservas de carbono respirado en el océano Pacífico glacial.
Conclusiones:
- El océano Pacífico glacial experimentó un agotamiento ampliado del oxígeno, aumentando su capacidad de almacenamiento de carbono.
- Este depósito de carbono expandido en el Pacífico fue un factor clave en la reducción del CO2 atmosférico durante las edades de hielo.
Videos de Conceptos Relacionados
01:20MOSFET: Depletion Mode
861
Depletion-mode MOSFETs represent a unique subset of MOSFET technology, functioning fundamentally differently from their enhancement-mode counterparts. Unlike enhancement MOSFETs, which require a positive gate-source voltage (Vgs) to turn on, depletion-mode MOSFETs are inherently conductive and "normally on" devices.
The primary characteristic of depletion-mode MOSFETs is their ability to conduct current between the drain and source terminals without gate bias. This inherent conductivity...
The primary characteristic of depletion-mode MOSFETs is their ability to conduct current between the drain and source terminals without gate bias. This inherent conductivity...
861
01:24Heat and Free Expansion
2.9K
The work done by a thermodynamic system depends not only on the initial and final states but also on the intermediate states—that is, on the path. Like work, when heat is added to a thermodynamic system, it undergoes a change of state, and the state attained depends on the path from the initial state to the final state. Consider an ideal gas cylinder fitted with a piston. When the cylinder is heated at a constant temperature, the gas molecules absorb energy and expand slowly in a...
2.9K
01:22Thermal Expansion
5.7K
The expansion of alcohol in a thermometer is one of many commonly encountered examples of thermal expansion, which is the change in size or volume of a given system as its temperature changes. The most visible example is the expansion of hot air. When air is heated, it expands and becomes less dense than the surrounding air, which then exerts an upward force on the hot air to, for example, make steam and smoke rise, and hot air balloons float. The same behavior happens in all liquids and gases,...
5.7K
01:27Oxygen Transport in the Blood
6.6K
Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...
6.6K
01:16Oxygen Delivering System II: Venturi Mask and Transtracheal Oxygen
2.3K
Oxygen therapy is a pivotal aspect of medical care, particularly for patients with respiratory ailments. Two prominent oxygen-delivering systems include the Venturi mask and the transtracheal oxygen catheter.
Venturi Mask
The Venturi mask, named after the Venturi effect, is designed to deliver precise oxygen concentrations. It consists of a large tube with an oxygen inlet that narrows down, causing a pressure drop that pulls air in through adjustable side ports. The mask is a lightweight,...
Venturi Mask
The Venturi mask, named after the Venturi effect, is designed to deliver precise oxygen concentrations. It consists of a large tube with an oxygen inlet that narrows down, causing a pressure drop that pulls air in through adjustable side ports. The mask is a lightweight,...
2.3K
01:26Oxygenic Photosynthesis
778
Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate...
778