Video Experimental Relacionado
Updated: Jul 8, 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
Flujo complejo generalizado en el interior de la capa de hielo antártica
1Bristol Glaciology Centre, School of Geographical Sciences, University of Bristol, University Road, Bristol, BS8 1SS, UK. British Antarctic Survey High Cross, Madingley Road, Cambridge, CB3 OET, UK. Jet Propulsion Laboratory, California.
Science (New York, N.Y.)
|February 26, 2000
Resumen
La capa de hielo de la Antártida.
Área de la Ciencia:
- Glaciología glaciología.
- Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima
- Ciencias del Sistema Terrestre Ciencias del Sistema Terrestre
Sus antecedentes:
- La descarga de la capa de hielo antártica se produce principalmente a través de corrientes de hielo que se mueven rápidamente.
- Estos arroyos son alimentados por cuencas, que anteriormente se pensaba que eran estables.
Objetivo del estudio:
- Para investigar los sistemas tributarios que alimentan las corrientes de hielo de la Antártida.
- Comprender las implicaciones para los tiempos de respuesta de las capas de hielo al cambio climático.
Principales métodos:
- Estimaciones de la velocidad del equilibrio utilizado.
- Analizaron datos de las principales cuencas de drenaje antárticas.
Principales resultados:
- Identificó complejos sistemas tributarios que se extienden hasta 1000 km hacia el interior.
- Desafió la noción de zonas de captación estables e inactivas.
Conclusiones:
- La dinámica de la capa de hielo antártica es más compleja de lo que se suponía anteriormente.
- Los hallazgos impactan los modelos de respuesta de las capas de hielo al forzamiento climático.
Videos de Conceptos Relacionados
02:39Phase Transitions: Melting and Freezing
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
01:28Magnetostatic Boundary Conditions
An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
01:28Irrotational Flow
Irrotational flow is characterized by fluid motion where particles do not rotate around their axes, resulting in zero vorticity. For a flow to be irrotational, the curl of the velocity field must be zero. This imposes specific conditions on velocity gradients. For instance, to maintain zero rotation about the z-axis, the gradient condition:
01:26General External Flow Characteristics
The study of external flow is essential for creating structures and objects that interact efficiently and safely with moving fluids, such as air or water. When a body is immersed in a flowing fluid, it experiences two primary forces: drag, which opposes motion along the flow direction, and lift, which acts perpendicular to the flow. The shape, size, and orientation of the object influence these forces.Streamlined and Blunt Bodies in External FlowObjects in fluid flow are classified as...
01:26Vector Forms of Green’s Theorem
The study of fluid motion often involves understanding how local rotational behavior relates to global circulation. In the context of a pond with pollutants, direct measurement of water movement along an irregular shoreline can be impractical. Green’s Theorem in vector form provides an alternative by relating the circulation around a closed boundary to properties of the flow within the enclosed region.Measurements of water velocity at different points define a continuous vector field that...
01:22Surface Integrals of Vector Fields: Flux
Understanding the movement of air masses is fundamental to meteorological analysis and atmospheric modeling. A key component in this process is quantifying the total mass of air that flows into or out of a defined region over a specified period of time. This is achieved by evaluating the mass flux across a boundary surface, a conceptual tool that simplifies the complex dynamics of atmospheric systems.To begin, an imaginary boundary surface S is introduced, enclosing the region of interest. The...