Video Experimental Relacionado
Updated: Jul 16, 2026
09:36
The Use of High-resolution Infrared Thermography (HRIT) for the Study of Ice Nucleation and Ice Propagation in Plants
Published on: May 8, 2015
¿Enfriar La Niña durante el calor del Plioceno?
1Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3PR, UK.
Science (New York, N.Y.)
|March 26, 2005
Resumen
Se debaten las dinámicas de El Niño-Oscilación Sur (ENSO) durante los períodos cálidos pasados. La evidencia sugiere que un estado similar a La Niña, no El Niño, prevaleció en el Plioceno, lo que indica un efecto de "termostato oceánico".
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Oceanografía La oceanografía es la oceanografía.
- Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima
Sus antecedentes:
- Se debate el papel de El Niño-Oscilación Sur (ENSO) en el calentamiento global y el cambio climático.
- Comprender los estados pasados de ENSO es crucial para predecir las respuestas climáticas futuras.
Objetivo del estudio:
- Para investigar las condiciones de ENSO durante la cálida época del Plioceno temprano y medio.
- Para probar la hipótesis de un estado persistente similar a El Niño frente a una respuesta dinámica del océano.
Principales métodos:
- Utilizó un paleotermómetro del Plioceno para reconstruir las temperaturas de la superficie del mar.
- Analizó la evidencia de la inclinación de la termoclina y el flujo ascendente en el Pacífico ecuatorial.
Principales resultados:
- Se encontraron evidencias de una mayor inclinación de la termoclina y un flujo ascendente frío, indicativo de un estado similar a La Niña.
- Contradijo las propuestas anteriores de condiciones cálidas persistentes similares a El Niño durante este período.
- Se observó un "termostato oceánico" dinámico donde el calentamiento tropical del Pacífico indujo el enfriamiento en el este.
Conclusiones:
- El Plioceno temprano y medio probablemente contó con un ENSO dinámico, que favoreció condiciones similares a La Niña.
- Esto sugiere un
- El termostato oceánico es un termostato oceánico.
- mecanismo que regula las temperaturas tropicales del Pacífico.
- Los hallazgos proporcionan información sobre las interacciones océano-atmósfera bajo escenarios de calentamiento sostenido.
Videos de Conceptos Relacionados
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.
02:45Responses to Heat and Cold Stress
Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
02:44Heating and Cooling Curves
When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
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...
01:23The Joule and Joule–Thomson Experiments
Consider an adiabatic system composed of two chambers, A and B, designed such that no heat flows into or out of the system. Initially, chamber A is filled with a gas at a fixed temperature T1, pressure p1, and volume V1, while chamber B is evacuated. The gas is then gradually forced through a rigid, porous barrier to chamber B, ultimately reaching temperature T2, pressure p2, and volume V2. A piston on the right side maintains a constant pressure (p2), which is lower than p1. The significant...
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...