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Global Climate Change

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.

Isothermal Processes

Isothermal Processes

A thermodynamic process that occurs at constant temperature is called an isothermal process. Heat slowly flows into the system or out of the system to maintain thermal equilibrium. Processes involving phase changes like water evaporation into steam or freezing water into ice at a constant temperature are examples of Isothermal Processes.
An ideal gas can also undergo isothermal expansion or compression.
For example, consider 1 mole of an ideal gas inside an isolated cylinder at initial volume V...

Isochoric and Isobaric Processes

Isochoric and Isobaric Processes

A thermodynamic process that occurs at constant volume is called an isochoric process. According to the first law of thermodynamics, heat supplied or removed from the system is partially utilized to perform work and change the internal energy of the system. However, in an isochoric process, the volume remains constant. Hence, the work done by the system is zero. Therefore, the exchange of heat changes the internal energy of the system only.
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Damped Oscillations

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In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
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Speciation Rates

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Speciation can proceed at markedly different rates, and evolutionary biologists commonly describe these differences through the models of gradualism and punctuated equilibrium. Both patterns explain how new species arise, but they differ in the tempo and continuity of evolutionary change. In both cases, evolutionary change arises from heritable variation within populations, with natural selection often shaping traits that improve survival and reproduction under specific environmental conditions.

Precipitation Gravimetry

Precipitation Gravimetry

Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
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El volcado deglacial sincrónico y los cambios en la fuente de masa de agua.

Natalie L Roberts¹, Alexander M Piotrowski, Jerry F McManus

¹Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, UK. nr297@cam.ac.uk

Science (New York, N.Y.)

|January 2, 2010

Resumen

Los cambios en la circulación oceánica durante la última deglaciación fueron sincrónicos, impactando en las fuentes de aguas profundas y las tasas de vuelco. Los eventos a escala milenaria como el evento 1 de Heinrich solo afectaron el vuelco superficial, que difiere de los cambios climáticos de todo el océano.

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Área de la Ciencia:

La paleoceanografía es la paleoceanografía.
Ciencias del clima Ciencias del clima Ciencias del clima
La geoquímica es la geoquímica.

Sus antecedentes:

Comprender la dinámica de la circulación oceánica es clave para descifrar los cambios climáticos pasados.
La última deglaciación proporciona una ventana crítica a los mecanismos abruptos del cambio climático.
La reconstrucción de los cambios en las profundidades oceánicas informa a los modelos climáticos globales.

Objetivo del estudio:

Para reconstruir los cambios profundos en las fuentes de agua del fondo del Atlántico Norte occidental durante la última deglaciación.
Para comparar los desplazamientos de las fuentes de masa de aguas profundas con las tasas de volcadura de los océanos.
Para diferenciar los impactos de los eventos climáticos a escala milenaria de las transiciones deglaciales.

Principales métodos:

Medidas de isótopos de neodimio en recubrimientos de óxido de hierro y manganeso.
Análisis de foraminíferos planctónicos de la subida de las Bermudas.
Comparación con los proxies existentes para la fuerza de volteo del océano.

Principales resultados:

La fuente de masa de aguas profundas y la tasa de vuelco cambiaron rápida y sincrónicamente durante la última transición deglacial.
Las perturbaciones de agua dulce del evento Heinrich 1 probablemente solo influyeron en el vuelco de los océanos poco profundos.
Se observaron respuestas distintas de volcado de océanos profundos versus poco profundos a diferentes forzamientos climáticos.

Conclusiones:

Los cambios en la circulación oceánica durante la deglaciación fueron rápidos y sincrónicos, afectando a toda la columna de agua.
Los eventos climáticos a escala milenaria tienen un impacto más localizado en la circulación oceánica en comparación con los principales eventos de deglaciación.
Este estudio refina nuestra comprensión del papel del océano en la regulación de las transiciones climáticas de la Tierra.