Video Experimental Relacionado
Updated: Jul 13, 2026
08:16
Ice Generation and the Heat and Mass Transfer Phenomena of Introducing Water to a Cold Bath of Brine
Published on: March 13, 2017
Intercambio de agua entre el lago subglacial Vostok y la capa de hielo que lo recubre
1Bristol Glaciology Centre, School of Geographical Sciences, University of Bristol, UK. m.j.siegert@bristol.ac.uk
Nature
|February 25, 2000
Resumen
El derretimiento subglacial y la congelación en el lago Vostok indican un intercambio de agua significativo entre la capa de hielo y el lago. Este proceso influye en el entorno subglacial, potencialmente soportando la vida.
Área de la Ciencia:
- La geofísica es la geofísica.
- Glaciología glaciología.
- Astrobiología Astrobiología.
Sus antecedentes:
- El lago Vostok, un lago subglacial de 200 km de largo en la Antártida, se encuentra debajo de la capa de hielo en la estación Vostok.
- Las condiciones en la base de la capa de hielo proporcionan información sobre el entorno del lago subglacial y su potencial habitabilidad.
Objetivo del estudio:
- Para analizar la estructura de la capa de hielo sobre el lago Vostok utilizando un radar aéreo.
- Para comprender la dinámica de la interacción entre hielo y agua en la interfaz del lago subglacial.
Principales métodos:
- Se realizaron encuestas aéreas de radar de 60 MHz para estudiar la estructura de la capa de hielo.
- El análisis se centró en la identificación de zonas de pérdida y acreción de hielo basal.
Principales resultados:
- Se identificaron distintas zonas de pérdida y acreción de hielo basal en la interfaz hielo-agua.
- El derretimiento subglacial y la pérdida neta de hielo ocurren en las partes norte y oeste del lago.
- Aproximadamente 150 m de acreción de hielo (congelación) se produce en la parte sur del lago.
Conclusiones:
- Se produce un intercambio de agua significativo entre la base de la capa de hielo y el lago Vostok.
- Este intercambio enriquece el lago con hidratos de gas, promueve la deposición de sedimentos e impulsa la circulación del agua del lago.
- Los hallazgos tienen implicaciones para la comprensión de la habitabilidad de los entornos subglaciales.
Videos de Conceptos Relacionados
01:23States of Water
Water exists in any one of the three classical states: solid (ice), liquid (water), and gas (steam or water vapor). The state of water depends on i) the intermolecular forces that draw molecules together and ii) the kinetic energy that leads to movements that pull them apart.
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
01:00The Water Cycle
The Earth’s hydrosphere includes all of the areas where the storage and movement of water occurs. Since water is the basis of all living processes, the cycling of water is extremely important to ecosystem dynamics.
01:22Thermal Expansion
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,...
01:18Fluid Movement Between Compartments
The force applied by fluids against a surface, known as hydrostatic pressure, initiates the transfer of fluid among different compartments. Within our blood vessels, the blood's hydrostatic pressure is a result of the heart's pumping action. At the arteriolar end of capillaries, hydrostatic pressure (capillary blood pressure) exceeds the opposing colloid osmotic pressure created primarily by plasma proteins like albumin. This discrepancy in pressure propels plasma and nutrients from the...
01:30Underflow Gates
Underflow gates are vital for controlling water flow in irrigation canals. The three main types of underflow gates — vertical, radial, and drum gates — serve different purposes while ensuring effective flow management. Vertical gates move up and down, generating a free-flowing water jet; radial gates pivot to regulate the flow; and drum gates rotate for precise adjustments. The flow through these gates is influenced by downstream conditions, resulting in free or drowned outflow.Free and Drowned...
01:25Indefinite Integrals
The water inflow rate into a storage tank is not constant but increases over time. Initially, the pump delivers water at a rate of 5 L/min. However, the inflow rate increases by 2 L/min for each additional minute due to rising pressure or system adjustments. This scenario can be described mathematically by a linear function:It is necessary to integrate the inflow rate function to measure the total volume of water added to the tank over time. The total water volume V(t) is obtained by performing...