File:Ice Age Temperature.png
Ice_Age_Temperature.png (564 × 377像素,文件大小:44 KB,MIME类型:image/png)
说明
摘要
[编辑]The first two curves shows local changes in temperature at two sites in Antarctica as derived from deuterium isotopic measurements (δD) on ice cores (EPICA Community Members 2004, Petit et al. 1999). The final plot shows a reconstruction of global ice volume on δ18O measurements on benthic foraminifera from a composite of globally distributed sediment cores and is scaled to match the scale of fluctuations in Antarctic temperature (Lisiecki and Raymo 2005). Note that changes in global ice volume and changes in Antarctic temperature are highly correlated, so one is a good estimate of the other, but differences in the sediment record do not necessarily reflect differences in paleotemperature. Horizontal lines indicate modern temperatures and ice volume. However, since geological records such as ice cores and sediments represent an average often on the scale of thousands of years, direct comparison to current values can be misleading. Larger, short term variations in ancient climate are not present in the fossil record. Hence the comparison is not comparing like with like and is scientifically invalid. Differences in the alignment of various features reflect dating uncertainty and do not indicate different timing at different sites.
The Antarctic temperature records indicate that the present interglacial is relatively cool compared to previous interglacials, at least at these sites. The Liesecki & Raymo (2005) sediment reconstruction does not indicate significant differences between modern ice volume and previous interglacials, though some other studies do report slightly lower ice volumes / higher sea levels during the 120 ka and 400 ka interglacials (Karner et al. 2001, Hearty and Kaufman 2000).
It should be noted that temperature changes at the typical equatorial site are believed to have been significantly less than the changes observed at high latitude.
Las dos primeras curvas muestran los cambios locales de temperatura en dos lugares de la Antártida, derivados de las mediciones isotópicas de deuterio (δD) en núcleos de hielo (EPICA Community Members 2004, Petit et al. 1999). El último gráfico muestra una reconstrucción del volumen global de hielo a partir de mediciones de δ18O en foraminíferos bentónicos de un compuesto de núcleos de sedimentos distribuidos por todo el mundo, y está escalado para ajustarse a la escala de las fluctuaciones de la temperatura antártica (Lisiecki y Raymo 2005). Nótese que los cambios en el volumen de hielo global y los cambios en la temperatura antártica están muy correlacionados, por lo que uno es una buena estimación del otro, aunque las diferencias en el registro de sedimentos no reflejan necesariamente las diferencias en la paleotemperatura. Las líneas horizontales indican las temperaturas modernas y el volumen de hielo. Sin embargo, dado que los registros geológicos, como los núcleos de hielo y los sedimentos, representan una media a menudo a escala de miles de años, la comparación directa con los valores actuales puede ser engañosa. Las grandes variaciones a corto plazo del clima antiguo no están presentes en los registros fósiles. Por lo tanto, la comparación no es similar y es científicamente inválida. Las diferencias en la alineación de los distintos rasgos reflejan la incertidumbre de la datación y no indican una cronología diferente en los distintos lugares.
Los registros de temperatura de la Antártida indican que el actual ciclo interglacial es relativamente frío en comparación con los anteriores, al menos en estos lugares. La reconstrucción de sedimentos de Liesecki y Raymo (2005) no indica diferencias significativas entre el volumen de hielo moderno y los ciclos interglaciares anteriores, aunque otros estudios informan de volúmenes de hielo ligeramente inferiores / niveles del mar más altos durante los interglaciares de 120 ka y 400 ka (Karner et al. 2001, Hearty y Kaufman 2000). Hay que tener en cuenta que se cree que los cambios de temperatura en el sitio ecuatorial típico han sido significativamente menores que los cambios observados en las altas latitudes.
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Copyright
[编辑]This figure was produced by Robert A. Rohde from publicly available data and is incorporated into the Global Warming Art project.
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References
[编辑]- Petit J.R., Jouzel J., Raynaud D., Barkov N.I., Barnola J.M., Basile I., Bender M., Chappellaz J., Davis J., Delaygue G., Delmotte M., Kotlyakov V.M., Legrand M., Lipenkov V., Lorius C., Pépin L., Ritz C., Saltzman E., Stievenard M. (1999) Climate and Atmospheric History of the Past 420,000 years from the Vostok Ice Core, Antarctica, Nature, 399, 429-436. [1]
- EPICA community members (2004) Eight glacial cycles from an Antarctic ice core, Nature 429:6992, 623-628, doi:10.1038/nature02599. [2]
- Lisiecki, L. E., and M. E. Raymo (2005), A Pliocene-Pleistocene stack of 57 globally distributed benthic d18O records, Paleoceanography, 20, PA1003, doi:10.1029/2004PA001071. [3]
- Hearty, P.J. and Kaufman, D.S. (2000) Whole-rock aminostratigraphy and Quaternary sea-level history of the Bahamas, Quaternary Research 54, 163-173.
- D. B. Karner, J. Levine, B. P. Medeiros, R. A. Muller (2002) Constucting a Stacked Benthic δ18O Record, Paleoceanography 17:0, doi:10.1029/2001PA000667.
Dragons flight's Temperature Record Series |
This figure is part of a series of plots created by Dragons flight to illustrate changes in Earth's temperature and climate across many different time scales. |
Time Period: 25 yrs | 150 yrs | 1 kyr | 2 kyr | 12 kyr | 450 kyr | 5 Myr | 65 Myr | 500 Myr |
For articles related to this topic see: Temperature record |
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