Video Experimental Relacionado
Updated: Jul 6, 2026
04:55
Using a Thermal Camera to Measure Heat Loss Through Bird Feather Coats
Published on: June 17, 2020
Un calentamiento significativo de la troposfera de invierno antártica
J Turner1, T A Lachlan-Cope, S Colwell
1British Antarctic Survey, Natural Environment Research Council, Cambridge CB3 0ET, UK. j.turner@bas.ac.uk
Science (New York, N.Y.)
|April 1, 2006
Resumen
Se ha descubierto un significativo calentamiento de la troposfera en el invierno antártico, mayor que cualquier otro calentamiento regional en la Tierra. Esta tendencia al calentamiento de 0,5-0,7 ° C por década durante 30 años se basa en nuevos datos de radiosondas antárticas.
Área de la Ciencia:
- Ciencias de la atmósfera Ciencias atmosféricas.
- Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima
- Meteorología de la Antártida.
Sus antecedentes:
- Las tendencias térmicas de la troposfera antártica no se comprenden bien.
- Estudios anteriores carecían de datos completos para el invierno antártico.
Objetivo del estudio:
- Para investigar el calentamiento no documentado en la troposfera del invierno antártico.
- Para cuantificar la velocidad y la importancia de los cambios de temperatura observados.
Principales métodos:
- Análisis de las observaciones de radiosondas antárticas recientemente digitalizadas y controladas por control de calidad.
- Análisis de series temporales para evaluar las tendencias de temperatura en los últimos 30 años.
Principales resultados:
- Una tendencia de calentamiento estadísticamente significativa de 0,5 a 0,7 ° C por década en la midtroposfera regional.
- Este calentamiento es mayor que cualquier calentamiento troposférico regional previamente identificado a nivel mundial.
- Los datos de las radiosondas confirmaron la homogeneidad temporal, asegurando la fiabilidad de los datos.
Conclusiones:
- Se ha identificado un calentamiento significativo y no documentado de la troposfera de invierno antártica.
- La causa de este calentamiento sigue siendo indeterminada con los datos actuales.
- Este hallazgo pone de relieve la necesidad de una mayor investigación sobre la dinámica climática de la Antártida.
Videos de Conceptos Relacionados
01:43Thermosensation
Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
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.
01:29Decreased Body Temperature
A decreased body temperature can occur in patients with hypothermia and frostbite. Heat loss with extended cold exposure overpowers the body's ability to create heat, resulting in hypothermia. Core temperature readings help classify hypothermia. Mild hypothermia is temperatures between 32 °C (89.6 °F) and 35°C (95 °F) and is caused by impaired thermoregulation. Moderate hypothermia is temperatures between 28 C (82.4 °F) and 32 °C (89.6 °F) caused by sustained extreme cold exposure, and severe...
01:21Masonry in Cold and Hot Weather Conditions
In cold weather, masonry construction requires specific precautions to ensure mortar does not freeze before curing, as this can significantly weaken its strength and watertightness. Mortar temperature should be maintained between 60°F and 80°F to support proper hydration and curing. Below 40°F, mortar water must be heated, but should not exceed 120°F as high temperatures can reduce mortar's compressive and bond strength.
Other key practices include keeping masonry units and sand dry and...
Other key practices include keeping masonry units and sand dry and...
01:18Boundary Layer Characteristics
When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...