Greenland ice core {open_quotes}signal{close_quotes} characteristics: An expanded view of climate change
- Univ. of New Hampshire, Durham, NH (United States)
- Cold Regions Research and Engineering Laboratory, Hanover, NH (United States)
- Laboratoire de Glaciologie et Geophysique de Environnement, St.-Martin-D`Heres (France)
- Univ. of Copenhagen (Denmark)
The last millenium of Earth history is of particular interest because it documents the environmental complexities of both natural variability and anthropogenic activity. The authors have analyzed the major ions contained in the Greenland Ice Sheet Project 2 (GISP 2) ice core from the present to {approximately}674 A.D. to yield an environmental reconstruction for this period that includes a description of nitrogen and sulfur cycling, volcanic emissions, sea salt and terrestrial influences. They have adapted and extended mathematical procedures for extracting sporadic (e.g., volcanic) events, secular trends, and periodicities found in the data sets. Finally, by not assuming that periodic components (signals) were {open_quotes}stationary{close_quotes} and by utilizing evolutionary spectral analysis, they were able to reveal periodic processes in the climate system which change in frequency, {open_quotes}turn on,{close_quotes} and {open_quotes}turn off{close_quotes} with other climate transitions such as that between the little ice age and the medieval warm period. 42 refs., 4 figs., 2 tabs.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 91356
- Journal Information:
- Journal of Geophysical Research, Vol. 98, Issue D7; Other Information: PBD: 20 Jul 1993
- Country of Publication:
- United States
- Language:
- English
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