Video Experimental Relacionado
Updated: Jul 12, 2026

09:06
Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside
Published on: July 3, 2016
Condiciones meteorológicas estratosféricas en el vórtice polar ártico, 1991 a 1992
Resumen
Las condiciones estratosféricas durante AASE II permitieron las observaciones de la formación de trihidrato de ácido nítrico. El vórtice polar se calentó antes de lo habitual, lo que condujo a una química estratosférica perturbada.
Área de la Ciencia:
- Ciencias de la atmósfera Ciencias atmosféricas.
- Química de la estratosfera en la estratosfera.
- Meteorología del Ártico.
Sus antecedentes:
- El invierno de 1991-1992 proporcionó condiciones estratosféricas únicas en el sureste de Canadá debido al posicionamiento del vórtice polar.
- La Expedición Estratosférica Aerotransportada del Ártico II (AASE II) tenía como objetivo estudiar estos fenómenos.
Objetivo del estudio:
- Para analizar las condiciones meteorológicas estratosféricas durante AASE II.
- Para investigar la formación de trihidratos de ácido nítrico (NAT) y las perturbaciones químicas asociadas.
Principales métodos:
- Análisis de los datos de temperatura estratosférica del invierno 1991-1992.
- Correlación de los datos de temperatura con la formación potencial de NAT y los cambios químicos.
Principales resultados:
- Las temperaturas estratosféricas indicaron potencial para la formación de trihidrato de ácido nítrico a principios de diciembre.
- Las temperaturas del vórtice polar se calentaron antes de lo normal a fines de enero.
- Se observó una química atmosférica perturbada y relacionada con las frías temperaturas estratosféricas.
Conclusiones:
- Las condiciones meteorológicas observadas facilitaron el estudio de la formación de nubes estratosféricas polares.
- El calentamiento temprano del vórtice polar influyó en la duración de las condiciones conducentes a la formación de NAT.
- Estas condiciones se asociaron con cambios significativos en la química estratosférica.
Videos de Conceptos Relacionados
Global 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.
What 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.
What is Weather?
Overview
Magnetostatic 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...
Phase Transitions: Vaporization and Condensation
The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
Phase Transitions: Sublimation and Deposition
Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...

