CONNOR WALDRON + STEPHEN WALKER MRS. GEITHNER P1 12/10/12 Ice Core Data.

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Presentation transcript:

CONNOR WALDRON + STEPHEN WALKER MRS. GEITHNER P1 12/10/12 Ice Core Data

Background Info Ice core  sample removed from ice sheet From the ice caps of Antarctica  Greenland  or from high mountain glaciers (Citation 3). Lower layers  are older than upper  ice core contains ice formed over a range of years (Citation 3).

Background Info Cont. 98% of Antarctic  covered by the ice sheet  2,500 meters thick  deepest location, 4,700 meters thick (Citation 3). Ice sheet formed by accumulation of snow  by drilling from the surface down  we are drilling back in time. Obtained with  PICO electro-mechanical drill

How Does This Affect the Climate? 130, ,000 years ago  warming period 1◦c- 2◦c warmer than now  called an inter-glacial (Citation 1). 120,000-20,000 years ago  long cooling period  called the Wisconsin Period  last Great Ice Age (Citation 1). 19,000-15,000 years ago  another warming period  to next inter-glacial (which we are in) (Citation 1). Inter Glacial today  one of many reasons for global warming  mostly due to humans

What are Isotopes? Many quantities have been measured in ice cores to make conclusions about earths history  such as oxygen isotope ratios  carbon dioxide (citation 6). concentration  methane concentration  electrical conductivity  and dust particle concentration. Atoms of the same element have different numbers of neutrons  The different possible versions of each element are called isotopes. Two types  O16 and O18  O16 reacts faster because  O18 contains 2 more neutrons Able to tell if climate changes when  O18 increases in ocean water  sign of warming period

Carbon Dioxide CO2 in the Ice Core Record For the first time in 400,000 years  CO2 is at 390 parts per million  continuing to rise at 2 parts per million (ppm) per year (Citation 5).

Works Cited Jouzel, J., R. D. Koster, R. J. Suozzo, G. L. Russell Stable water isotope behavior during the last glacial maximum: A general circulation model analysis. Journal of Geophysical Research, 99: Antarctic Ice Cores and Environmental Change. Dr. T.H. Jacka, Web. 5 Dec "Ice Cores." Climate Data Information. N.p., Web. 6 Dec "New Antarctic Ice Core Data: A Closer Look." New Ice Core Data: A Closer Look. N.p., 30 May Web. 6 Dec "CO2 in the Ice Core Record." National Ice Core Laboratory Science Management Office. Dr. Richard Alley, n.d. Web. 10 Dec "Isotopes." Isotopes and Radioactivity. N.p., n.d. Web. 10 Dec